JPH08172924A - Mat seedling to be packed into rice transplanter - Google Patents

Abstract

PURPOSE: To obtain the mat seedling capable of surely preventing collapse of a mat part and unfastening of seedlings by arranging an uneven mat having water resistance before transplantation and corroding after transplantation under bed soil. CONSTITUTION: A readily tearable sheet 6 having water resistance before transplantation and corroding after transplantation, having air permeability and water absorption properties is laid under bed soil 4. Roots 12 of seedlings 7 are penetrated from the bed soil into the lower side of the sheet and mutually entangled with the lower side of the sheet. The sheet has excellent adhesivity to the bed soil and no difficulty after transplantation. An embossed waterproof paper 9 obtained by embossing waterproof paper made of natural pulp, having a fine uneven pattern by crape processing into an uneven state is preferably as the sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mat seedling for loading rice transplanters.

[0002]

2. Description of the Related Art A mat seedling for loading rice transplanters is a mat with one floor soil portion. In the case of raising this mat seedling, a method is generally used in which a bed soil is uniformly placed in a nursery box and seeds are sown on the bed soil in a streak-like or scattered form, and then covered with soil. Has been adopted, and is used for raising seedlings and middle seedlings ("New Edition Handbook of Agricultural Machinery", page 494, Japan Society of Agricultural Machinery, March 3, 1984).
0th day issued by Corona).

However, since the number of seedling raising boxes is large and the seedling raising period is long for the young seedlings and the medium seedlings, there is a problem in terms of seedling raising costs, work efficiency, and other points. Therefore, in recent years, there is a tendency that the seedling transplantation in which the seedlings are loaded into a rice transplanter and transplanted at the time of the seedlings having a leaf age of less than 2 leaves is becoming popular. In the case of this seedling transplantation, there are advantages that the number of nursery boxes can be reduced, the period for raising seedlings can be shortened, and additional fertilizer applied during the period for raising seedlings is unnecessary.

[0004] As a milk seedling raising method for raising mat seedlings of milk seedlings, conventionally, there are a rock wool mat raising method using a rock wool mat and a water resistant paper raising method using a water resistant paper ("Tohoku Agricultural Research No. 46, pp. 25-26
Proceedings of the 36th Tohoku Agricultural Research Conference (published by Tohoku Agricultural Experiment Research Council, July 29, 1993 at Akita City Cultural Center). In addition, there is also a compound raising seedling sheet raising method using a compound raising seedling sheet.

The rock wool mat seedling raising method is a method in which a rock wool mat is used in place of the floor soil, and this rock wool mat is laid in a seedling raising box and seeded with paddy, watered and covered with soil to raise seedlings. is there. The waterproof paper seedling raising method is to spread a waterproof paper of about C-30M (30 g or more per square meter and less than 40 g per square meter) in a nursery box, put the soil on the waterproof paper, and put paddy on the soil. It is a method of sowing, covering soil and raising seedlings.

[0006] The compound seedling raising method uses a natural pulp water-absorbing layer containing a water-absorbing polymer between a thin upper surface paper and a thick lower surface paper, and these are integrally formed by embossing. This is a method in which the compounded seedling-raising sheet is used, and the compound seedling-raising sheet is laid in a seedling-raising box, and bed soil is put on the seedling-growing sheet to sow the paddy and cover the soil to grow seedlings.

[0007]

The conventional methods for raising seedlings for milk seedling have the following drawbacks. That is, in the case of the rock wool mat seedling raising method, since a special rock wool mat is used instead of the floor soil, there is an advantage that the preparation of the floor soil is unnecessary, while the rock wool mat significantly raises the seedling raising cost, There is a limit to reducing the cost of raising rice seedlings. Moreover, since the seedlings are grown without fertilizer, there is a drawback that the growth of plant height of the seedlings is slow when the seedlings are grown at low temperature.

In the case of the compound seedling raising sheet raising method, since the seedling raising cost is increased due to the use of the special compound raising seedling sheet, only the root grows in the bed soil above the compound raising seedling sheet, and the roots are mixed. Since it does not penetrate the nursery sheet,
There is a drawback that the amount of bed soil increases. Further, since the composite seedling-growing sheet itself is not water-resistant and the reinforcing effect of the composite seedling-growing sheet on the mat portion of the mat seedling is extremely small, it is very troublesome to handle when loading it into the rice planting machine, and there is a drawback that workability is lacking.

On the other hand, the conventional water-resistant paper raising method is C-30.
Since water resistant paper of about M can be used and natural soil such as upland soil, paddy soil, and mountain soil can be used for the floor soil, cost reduction is greatly reduced compared to the rock wool mat seedling raising method and the compound seedling raising sheet raising method. There is an advantage that can be promoted. In addition, since base fertilizer is applied at the time of raising seedlings, there is an advantage that the plant height of the seedlings is steadily extended even at low temperature, as compared with the rock wool mat raising method.

However, in the conventional water-resistant paper-growing method, since a flat water-resistant paper such as a crepe-processed water-resistant paper is generally used, the root-water-resistant paper may not be used depending on the soil. There is no penetration, and there is a defect that the mat part of the mat seedlings collapses during transplantation and the seedlings become dislocated.

That is, at the time of a milk seedling having a leaf age of less than two leaves, the roots are not fully developed and the length thereof is short, so that the roots of each seedling are entangled with each other and the mat portion collapses. It cannot be expected to prevent it. Therefore, the roots of the seedlings are penetrated from the floor soil side to the lower side of the waterproof paper, the adhesion of the floor soil and the waterproof paper is secured by the roots of the seedlings, and the strength of the entire mat part is reinforced by the waterproof paper. There is a need.

However, in the conventional water-resistant paper seedling raising method, when black grain soil, granite soil, or commercially available soil is used, there are few fine powder granules in the bed soil itself. A void is created between the waterproof paper and the root of the seedling extends into the void. For this reason, the number of roots penetrating the waterproof paper is extremely reduced, and depending on the condition of the floor soil to be used, the adhesion between the floor soil and the waterproof paper is reduced and the shape retention of the mat portion is significantly reduced. .

Therefore, when the seedlings are loaded into the rice transplanter and transplanted, several seedlings are scraped off with the planting nails to be planted. There is a risk that the plant will be out of stock, and that the water-resistant paper at the scraped portion will remain on the seedling stand side of the rice transplanter without tearing. Therefore, there is a drawback that the soil to be used is significantly restricted. In view of such conventional problems, the present invention has a very good adhesion between the bed soil and the sheet even at the time of the milk seedling having a leaf age of less than 2 leaves, and moreover, the collapse of the mat portion and the variation of the seedling are surely ensured. It is an object to provide a mat seedling for loading a rice transplanter that can be prevented.

[0014]

According to the present invention as set forth in claim 1, an uneven sheet having a water resistance before transplantation and a corrosive property so as to corrode after transplantation is provided under the soil 4. The root 12 of the seedling 7 having 6 and grown on the side of the floor soil 4 penetrates from the floor soil 4 to the lower side of the sheet 6 and becomes entangled with each other on the lower side of the sheet 6.

According to a second aspect of the present invention, in the first aspect of the invention, the sheet 6 is an embossed waterproof paper 9 formed in an uneven shape by embossing, and the strength in the longitudinal direction of the mat is the mat width. It is larger than the strength in the direction.

[0016]

According to the present invention as set forth in claim 1, an uneven sheet 6 having water resistance before transplanting is provided below the floor soil 4.
The roots 12 of the seedlings 7 grown on the side of the bed soil 4 are sheeted from the bed soil 4.
Since it penetrates under the sheet 6 and is entangled with each other under the sheet 6, even when the seedling 7 has a leaf age of less than 2 leaves, the adhesion between the bed soil 4 and the sheet 6 is high. It is very good, and it is possible to reliably prevent the mat part 3 from collapsing and the seedlings from falling apart. Further, since the sheet 6 has corrosiveness such that it corrodes after transplantation, there is no obstacle after transplantation.

According to the second aspect of the present invention, the sheet 6 is the embossed waterproof paper 9 formed in an uneven shape by embossing, and the strength in the longitudinal direction of the mat is greater than the strength in the width direction of the mat. In addition to raising seedlings at low cost, mat seedlings can be handled and transplanted easily.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. Fig. 1 shows the state of raising seedlings in the seedling raising box 1 up to the seedling state, Fig. 2 shows the seedling mat seedling 2 taken out of the raising seedling box 1 before loading into the rice transplanter, and Fig. 3 shows the essential points of Fig. 2. The enlarged cross section of a part is shown.

In FIGS. 1 to 3, reference numeral 3 denotes a mat portion of the mat seedling 2, which is composed of a floor soil 4 and a cover soil 5, and a sheet 6 adhered to the lower side of the floor soil 4. 7 is a large number of seedlings that are vegetated above the mat part 3 and seeded with paddy 8 on the bed soil 4 and covered with soil for about 7 to 8 days. , The plant height is about 7 cm. Floor soil 4 and soil cover
As the seedling 5, the commercially available soil for raising seedlings, or the granular soil for black soil collected from fields or the like is used. The bed soil 4 has a thickness of 13 mm or more and has a base fertilizer applied thereto, and the cover soil 5 has a thickness enough to completely cover the paddy 8 after sowing.

The sheet 6 has at least water resistance before transplantation,
A material having breathability and water absorbency in addition to corrosiveness after transplantation and which is easily tearable at the time of transplantation is formed into an uneven shape. For example, a fine uneven pattern is formed by creping. An embossed waterproof paper 9 obtained by embossing a waterproof paper made of natural pulp of about -30M to C-70M in an uneven shape is used. In this embossed waterproof paper 9, concave portions 10 and convex portions 11 formed by embossing are arranged in a substantially uniform manner over the whole thereof, and the concave portions 10 and the convex portions 11 are formed independently. ing. Incidentally, general physical properties such as weight, thickness and density of each embossed waterproof paper 9 from C-30M to C-70M are as shown in Table 1.

[0021]

[Table 1] The size, shape, etc. of each concave portion 10 and the convex portion 11 vary depending on the thickness of the embossed water-resistant paper 9 itself.
It depends on the relative relationship with the thickness of 9, but the dimensions of each part are
For example, in the case of C-40M embossed waterproof paper 9,
It is as follows. That is, the height of the concave portion 10 and the convex portion 11 is 1 to
4 mm, the width of the concave portion 10 and the convex portion 11 on the base side is 1 to 5 mm,
The pitch between the concave portions 10 or the convex portions 11 is about 3 to 9 mm.

Further, the concave portion 10 and the convex portion of the embossed waterproof paper 9
The size of 11 is the floor soil near the upper side of the embossed waterproof paper 9.
Since it is necessary to minimize the voids generated in the
It is also greatly related to the particle size composition of For example, if the particle size composition of the bed soil 4 is relatively fine, use the one with the small recesses 10 and the small projections 11. If the particle size composition is relatively large, use the recesses 1
The one with 0 and the large convex portion 11 is used. 12 roots of each seedling 7
About 35-60% is embossed waterproof paper from the side of the soil floor 4
It penetrates through 9 and extends to the lower side, and it is intricately entwined with each other along the embossed waterproof paper 9 on the lower side.

When raising this mat seedling 2, it is carried out as follows. First, as shown in FIG. 4 (I), a predetermined nursery box 1 is prepared, and an embossed waterproof paper 9 is laid on the bottom plate 13 in the nursery box 1. At this time, embossed waterproof paper
In No. 9, since the pulp fibers are aligned in the substantially vertical direction during the papermaking process during papermaking, as shown in Table 1, the tensile strength in the longitudinal direction is greater than that in the lateral direction, and the elongation in the longitudinal direction is small. Therefore, the embossed waterproof paper 9 is laid so that the longitudinal direction thereof coincides with the longitudinal direction of the nursery box 1. Then, as shown in FIG. 4 (II), the embossed water-resistant paper 9 is applied with a floor soil to a thickness of about 13 mm.
4 and then irrigate the soil 4 so that the soil 4 is in an appropriate wet condition. The bottom plate 13 is formed with an appropriate number of small holes 14.

When the embossed waterproof paper 9 is laid on the bottom plate 13 of the nursery box 1 in this manner, the embossed waterproof paper 9 is formed with innumerable recesses 10 and projections 11 substantially uniformly over the entire surface thereof. Therefore, the voids 15 corresponding to the recesses 10 and the protrusions 11 of the embossed waterproof paper 9 can be made substantially uniform between the bottom plate 13 of the nursery box 1 and the air, that is, the voids 15. , A state where oxygen is accumulated can be obtained. Then, after irrigating the bed soil 4, as shown in (III) and (IV) of FIG. 4, the paddy rice 8 in an appropriately germinated state was sown on the bed soil 4, and the same cover soil as the bed soil 4 was sown.
Cover paddy 8 with 5. The seeds of paddy 8 may be sowed or scattered.

After the seeding of the paddy 8 is completed, the seedlings are raised under the prescribed raising conditions until the leaf age becomes less than 2 leaves. During this seedling raising period, the paddy 8 germinates and roots, and the shoot grows, and the root 12 grows downward in the bed soil 4 to the upper surface side of the embossed waterproof paper 9. When the root 12 reaches the embossed waterproof paper 9, in general, the root 12 of the plant has an air layer, that is, it has the property of expanding in search of oxygen.
Most of the roots 12 penetrate the embossed waterproof paper 9 and extend downward.

That is, below the embossed waterproof paper 9,
Void 15 that communicates with the outside of nursery box 1 through hole 14 in bottom plate 13.
The air is accumulated in the voids 15, and the embossed waterproof paper 9 itself has innumerable fine holes and has a proper air permeability. Therefore, the roots 12 extending to the embossed waterproof paper 9 extend to the space 15 side of the lower side of the embossed waterproof paper 9 for air, that is, oxygen, and penetrate the embossed waterproof paper 9 to the lower side. To grow.

In particular, the upper side of the embossed waterproof paper 9 is filled with the moist soil 4, and the porosity of the upper side of the embossed waterproof paper 9 is positively affected by the concave portion 10 and the convex portion 11 by the embossing. The number of voids 15 is extremely small compared to the lower side that secures the voids 15, and the voids 15 below the embossed waterproof paper 9
Since there is air in the embossed waterproof paper 9, the root 12 that extends to the embossed waterproof paper 9 becomes the embossed waterproof paper 9 via the portion of the embossed waterproof paper 9 with the least resistance, for example, the intermediate portion between the concave portion 10 and the convex portion 11. On the other hand, the embossed waterproof paper 9 penetrates from the upper side to the lower side, such as penetrating in a substantially right angle direction.

When a flat waterproof paper without embossing is used, in the soil 4 having a large particle size and a large amount of air, after the tip of the root 12 comes into contact with the waterproof paper, the waterproof paper becomes an obstacle. The 12 itself will extend laterally along the waterproof paper on the lower side of the floor soil 4, and the penetration rate of the root 12 will be extremely reduced.

However, when the embossed waterproof paper 9 is used, an air layer is formed by the voids 15 on the lower side of the embossed waterproof paper 9 and the same C-40M embossed waterproof paper 9 is used.
However, due to the elongation during embossing, the thickness of itself is locally or entirely reduced, and
Since the entire surface is uneven due to the 10 and the convex portion 11, the floor soil 4 with a small grain size is, of course, the floor soil with a small grain size.
In the case of No. 4, even after the tip side of the root 12 comes into contact with the embossed waterproof paper 9, the unevenness of the root 12 restricts the lateral extension of the root 12, making it difficult to extend laterally at the bottom of the soil 4.

In other words, in other words, embossed waterproof paper
After reaching 9, the embossing of the roots 12 against the embossed waterproof paper 9 becomes much easier on any soil 4 and the roots 12
Most of them can be penetrated through the embossed waterproof paper 9 in a relatively short period of time and extended to the lower side of the embossed waterproof paper 9.

The root 12 extending downward through the embossed waterproof paper 9 has the bottom plate 13 of the nursery box 1 below it. It is guided and bends laterally in the void 15, and freely extends in the direction in which it easily extends. Therefore, each root 12
The embossed waterproof paper 9 and the bottom plate 13 of the nursery box 1 are intertwined with each other by intersecting each other.

Particularly, in the embossed waterproof paper 9, since the concave portion 10 and the convex portion 11 are independent of each other and the concave portion 10 abuts on the upper surface of the bottom plate 13 of the seedling raising box 1, during the seedling raising period, the soil 4 Even if the uneven shape of the embossed waterproof paper 9 is damaged to some extent due to the weight of the side or the extension of the root 12, the gap 15 between the embossed waterproof paper 9 and the bottom plate 13 of the nursery box 1
Are in a mesh-like substantially continuous state or a state close thereto, and each root 12 penetrating the embossed waterproof paper 9 can be extended in a complicated manner in the void 15 along the upper surface of the bottom plate 13. .

Therefore, the roots 12 penetrating the embossed waterproof paper 9 do not extend downward as they are, and each root 12 can be brought into a close contact state or a state close thereto along the lower side of the embossed waterproof paper 9. At the same time, it is possible to entangle each root 12 with each other in a complicated manner, and the root 12 fits under the embossed waterproof paper 9 very well, and further promotes the entanglement between the roots 12. You can

By the way, in a milk seedling 7 having a plant height of about 7 cm and a leaf age of about 1.5, one paddy 8 has about 5 to 6 roots 12, and the root 12 has the longest length. 12 is about 5 to 6 cm, but when embossed waterproof paper 9 is used,
About 35 to 60% of the total number of roots 12 rooted from the paddy 8 can be penetrated to the lower side, and the roots 12 are joined along the embossed waterproof paper 9 below the embossed waterproof paper 9. It is possible to entangle intricately.

The above-mentioned state occurs when the seedlings are raised up to a milk seedling 7 having a leaf age of about 1.5. Therefore, if the seedlings are taken out from the seedling raising box 1 thereafter, the mat seedlings for loading rice planting machine as shown in FIG. 1 are obtained. You can get 2. That is, 35 of the total number of roots 12
About 60% penetrates the embossed waterproof paper 9, extends along the lower side, and the roots 12 are intricately entwined with each other, so the floor soil 4 of the mat part 3 and the embossed waterproof paper. The roots 12 ensure a close contact with the roots 9 and the embossed waterproof paper 9 can serve to strengthen the mat seedlings.

This mat seedling 2 is the soil of the mat part 3
The close contact between 4 and the embossed waterproof paper 9 is very good, and it is possible to eliminate the drawbacks of the mat seedlings of the nursery raised by the conventional waterproof paper raising method. That is, since the embossed waterproof paper 9 that is formed in an uneven shape is used, the relative slippage between the floor soil 4 side and the embossed waterproof paper 9 is small, and the floor soil 4 side is originally present. Of about 5 to 6 roots 12 rooted from each paddy 8 of the above, 35 to 60% of them are soil
Since the embossed waterproof paper 9 is penetrated from the 4 side, each root 12 penetrating the floor soil 4 and the embossed waterproof paper 9 is penetrated.
9 can be reliably prevented from separating.

Therefore, the mat portion 3 of the mat seedling 2 can be surely reinforced by the embossed waterproof paper 9 and the root 12, and the collapse of the mat portion 3 is extremely reduced, and its shape retention is remarkably improved. To do. Further, not only 40 to 50% of each root 12 penetrates the embossed waterproof paper 9, but the penetrated root 12 extends below the embossed waterproof paper 9 along the lower surface side of the embossed waterproof paper 9. , Since the roots 12 are intricately entwined with each other, the floor soil 4 and the embossed waterproof paper 9 can be more firmly adhered to each other, and the floor soil 4 and the embossed waterproof paper 9 are The binding condition is very good.

Therefore, even if the seedling 7 has a leaf age of about 1.5 and the root 12 is not sufficiently developed as compared with the seedlings, the mat portion 3 of the mat seedling 2 collapses. Since it can be reliably prevented, the mat seedling 2 can be wound into a roll and handled when it is loaded into the rice transplanter.
The handling is very easy and the work efficiency is improved.

Also, when transplanted by a rice transplanter, C-30
With M to C-70M embossed waterproof paper 9, since the waterproof paper strength is appropriate, the risk of scraping mistakes due to the planting nails, seedling dislocation, stunting, etc., is greatly reduced, and the seedlings produced by the planting nails are greatly reduced. 4 soil when scraping
The embossed waterproof paper 9 and the embossed waterproof paper 9 can be scraped together from the mat part 3, and the problem that the embossed waterproof paper 9 remains on the seedling mounting table side can be prevented.

Furthermore, the root that penetrates the embossed waterproof paper 9
12 is along the underside of the embossed waterproof paper 9 so the root
The root 12 itself is much less damaged than the one in which 12 is greatly extended downward from the embossed waterproof paper 9, and the mat seedling 2 is easy to handle after taking it out from the seedling raising box 1. The root 12 can be transplanted with a rice transplanter in a state with little damage, and the seedling after transplantation can have good rooting property in a paddy field.

Further, since the longitudinal direction of the embossed waterproof paper 9 is the longitudinal direction of the mat seedling 2, even when transplanted by the rice transplanter, the mat portion of the mat seedling 2 is made by the planting claws.
3 can be easily torn vertically and horizontally at a specified number of positions. Moreover, since the mat part 3 of the mat seedling 2 can be reinforced by the embossed waterproof paper 9 and the root 12, the thickness of the floor soil 4 is increased in consideration of collapse and dislocation after being removed from the nursery box 1. There is no need, and the amount of bed soil 4 used can be reduced, and at the same time, the seedling raising box 1 after seeding is lightweight and can be easily transported, and in this respect, the economical efficiency and workability are significantly improved.

The embossed waterproof paper 9 itself is mainly made of natural pulp and is corrosive. Therefore, after being transplanted to a paddy field, it gradually corrodes with the passage of time, which may affect the growth of rice thereafter. Next, we will show the test results when actually raising 7 seedlings using embossed waterproof paper 9.

All the embossed waterproof papers 9 are C-40M.
4 types of A, B, C, and D were used, and the floor soil 4 and the cover soil 5 were Iseki soil (trademark) and black soil granular soil. A
As shown in (I) and (II) of FIG.
And the height a of the protrusion 11 is 1.45 mm, and the width b of the base is 1.
96 mm, spacing c between bases is 3.92 mm, pitch d
So that the distance is about 5.69 mm
It is an embossed waterproof paper 9 with a slightly larger size.

As shown in FIG. 5 (III), the B type has independent recesses 10 and protrusions 11 having a height a of 0.59 mm, a base width b of 0.71 mm, and a space c between the bases. 1.43 mm,
This is an embossed waterproof paper 9 in which each concave portion 10 and convex portion 11 are formed to be slightly smaller so that the pitch d is 1.90 mm. C type has a height a of 0.72 m as shown in (IV) of FIG.
m, the width b of the base is 0.82 mm, and the pitch d is 1.66 m.
This is an embossed waterproof paper 9 in which a concave portion 10 and a convex portion 11, which are slightly smaller than m, are formed in a lateral groove shape.

The D type is a waterproof paper which is not embossed but is creped. In addition, (II) (III) of FIG.
Shows a section taken along line XX of FIG. The general physical properties of the A-type, B-type and C-type embossed waterproof paper 9 used in this test are as shown in Table 2.

[0046]

[Table 2] Table 3 shows the change over time in the wet strength of each of the A-type, B-type, and C-type embossed waterproof paper 9.

[0047]

[Table 3] The particle size composition of the ISEKI soil is 41% by weight for less than 1.00 mm, 54% by weight for 1.0-3.35 mm, 3.36-
5.00 mm is 5% by weight, and the black soil granular culture particle size composition is less than 1.00 mm, 19% by weight, 1.0 to 3.35.
mm is 71% by weight and 3.36-5.00 mm is 10% by weight. Using the four types of embossed waterproof paper 9 of A type, B type, C type, and D type, and the Iseki soil and the black soil granular soil, a test for raising seedlings was carried out for each combination of test groups shown in Table 4.

[0048]

[Table 4] The conditions for this seedling raising test are as follows. Product type: Akitakomachi floor Soil volume: 13 mm (2.1 l) / box Seeding rate (converted to dry paddy 8): 200 g / box Base fertilizer amount: N2.0 g / box P2.4 g / box K
1.7 g / box Covering soil: common soil 1.0 l / box Seeding period: October 17, 1993 Germination: Stacking in seedling raising machine 48 at 32 ° C
Time heating Greening / hardening: After budding in a glass room, cover with silver poly sheet for 2 days, then remove the seedlings and raise seedlings End of seedling raising period: October 25, 1993 Number of seedling raising days 8
Table 5 shows the growth status of the seedlings and whether or not the mat seedling 2 can be wound up in each test section in the above-mentioned seedling raising test.

[0049]

[Table 5] Next, the test results will be considered. As is clear from Table 5, the germination status was not rooted in each test section,
The budding was good, and there was no budding disorder due to the use of water-resistant paper, regardless of whether it was embossed water-resistant paper 9 or untreated water-resistant paper. The growth of seedlings is good in each test area, and the plant height at the end of seedling growth is 1.5 to 1.6 cm and the leaf age is 1.5 to 1.6 cm.
There was no difference in each test section with 1.6.

When the number of paddy grains per 5 × 5 cm ² was 115 in each test group, the total number of roots was 633 and the average rooting per grain was 5.5. Of the total number of roots, the number of roots 12 that penetrated the embossed waterproof paper 9 was 365, 343, the most for the A-type embossed waterproof paper 9 in both Iseki soil and black soil granular soil. In many cases, the roots 12 penetrated the embossed waterproof paper 9 with a penetration rate of 50% or more based on the total number of roots. And embossed waterproof paper
The number of roots 12 penetrating 9 tended to decrease in the order of B type, C type, and D type.

Further, in the A-type embossed waterproof paper 9, 365 Iseki soils, 343 black soil granular soils, and 4 soils
There was only a slight difference due to the difference in particle size composition. However, in each of the B-type and C-type embossed waterproof papers 9 and the D-type waterproof paper, 238, 231 and 118 Iseki soils are used, while 225 and 111 Black soil granular soils are used.
It is 0, and the black soil granular soil has 12 roots than the ISEKI soil.
In the case of the D type, the root 12 was not penetrated at all in the test section using the black soil granular soil.

Of the 633 roots in total, the number of roots 12 reaching the embossed waterproof paper 9 was 538 in each test section (about 85% of the total roots). The penetration rate against the number reached is 67.8% for Iseki soil and 6 for black soil granular soil for A-type embossed waterproof paper 9.
It becomes 3.7%. Therefore, assuming that the arrival rate is 80%, it is assumed that about 80% of the total number of roots, that is, 506 roots 12 reach the embossed waterproof paper 9, and in the case of A type embossed waterproof paper 9. Has a penetration rate of 72% for the ISEKI soil and 67.7% for the black soil granular soil. From these results, the larger the shape of the concave portions 10 and the convex portions 11 of the embossed waterproof paper 9 and the finer the particle size composition of the floor soil 4, the better the penetration rate at which the root 12 penetrates the embossed waterproof paper 9. I understand.

This is the period for raising seedlings 7 (7 to 8 days).
The degree of change in the wet strength of the embossed water-resistant paper 9 itself was extremely small, and the embossed water-resistant paper 9 was maintained during the seedling raising period.
The uneven shape of can be sufficiently maintained or sustained, and the shape of the concave portion 10 and the convex portion 11 of the embossed waterproof paper 9 is large,
The finer the particle size composition, the more embossed waterproof paper
It is difficult to form voids inside the floor soil 4 near the upper side of the floor soil 9.
The density of 4 is large, the void 15 under the embossed waterproof paper 9 is large, and a large amount of air layer is formed under the embossed waterproof paper 9, and the air permeability of the embossed waterproof paper 9 is large. It is understood that it is due to the fact that the embossed waterproof paper 9 has a relatively large resistance when the root 12 penetrates the embossed waterproof paper 9 and that the air permeability to the lower air layer is large. be able to.

After the seedling raising, the mat seedling 2 is taken out from the seedling raising box 1 and wound into a roll.
In the case of using the embossed water-resistant paper 9 of type B or B, both ekiseki soil and black soil granular soil were possible. However, when C-type embossed waterproof paper 9 is used, it is possible with ISEKI soil, but with black soil granular soil the matte portion
It was impossible because 3 collapsed. Further, it was impossible in the test section using the C-type embossed waterproof paper 9 and the D-type waterproof paper with the black soil granular soil.

This is an A-type or B-type embossed waterproof paper.
When 9 was used, when C-type embossed waterproof paper 9 was used with ISEKI soil, the penetration rate was 35% or more with respect to the total number of roots, and the penetration rate was assumed to be 80%. Is 44% or more, and since more than 225 roots 12 in absolute numbers penetrate the embossed waterproof paper 9, the adhesion between the floor soil 4 and the embossed waterproof paper 9 is very good. This is because the mat portion 3 of the mat seedling 2 does not collapse.

On the other hand, when black soil granular soil was used as the C-type embossed waterproof paper 9, and when D-type waterproof paper was used, the absolute number of roots 12 penetrating the waterproof paper was very small, This is because the degree of adhesion between the soil 4 and the waterproof paper is extremely reduced.
It goes without saying that the strength of the embossed waterproof paper 9 in the wet state in the vertical direction is sufficient to prevent the mat portion 3 of the mat seedling 2 from collapsing.

According to the results of this seedling raising test, when the soil 4 is put on the waterproof paper and the seedling 7 is raised, the growth of the plant height is good regardless of the presence or absence of the embossing treatment. It turns out that it is easy to secure. But the seedlings
In the state of 7, root 12 is not sufficiently developed, so when using D-type waterproof paper without embossing, it not only makes it difficult to put it on the rice planting machine, but also scratches it with the planting claws of the rice planting machine. The mat part 3 collapses during picking, resulting in a lack of stock, resulting in large fluctuations in the number of seedlings per stock.

Therefore, if Izeki soil is used for the embossed waterproof paper 9, especially the A-type and B-shaped embossed waterproof paper 9 or the C-shaped embossed waterproof paper 9, the root 12 of the embossed waterproof paper 9 can be obtained. Good penetration and improved adhesion between the floor soil 4 and the embossed waterproof paper 9 prevent the mat part 3 of the mat seedling 2 from collapsing and solve the problems of the conventional waterproof paper raising method. can do.
In particular, the results of this seedling raising test revealed that the embossed water resistant paper 9 suitable for any type of floor soil 4 was type A or type B, and type A was the most suitable and extremely practical.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments. For example, in the embodiment, the uneven shape of the waterproof paper 17 is formed to have a trapezoidal cross section, but the tips of the concave portion 10 and the convex portion 11 may be formed to be spherical. In addition, although the mat seedling 2 of the present invention is a milk seedling 7 in the examples, it can be used for raising seedlings having a leaf age of 2 leaves or more and relatively close to the milk seedling 7, or seedlings having a leaf age of more than 2 or middle seedlings. Can also be used, and is not limited to breastfeeding.

[0060]

According to the present invention described in claim 1, floor soil
On the lower side of 4 is provided an uneven sheet 6 having water resistance before transplantation and corrosive so as to corrode after transplantation.
Since the roots 12 of the seedlings 7 grown on the 4th side penetrate from the bed soil 4 to the lower side of the sheet 6 and become entangled with each other on the lower side of the sheet 6, the leaf age is less than 2 leaves. Even at the time of breast seedling 7, the adhesion between the bed soil 4 and the sheet 6 is very good,
Moreover, the mat portion 3 of the mat seedling can be reinforced, and the collapse of the mat portion 3 and the dislocation of the seedling can be reliably prevented.

According to the second aspect of the present invention, in the first aspect of the invention, the sheet 6 is the embossed waterproof paper 9 formed in an uneven shape by embossing, and has a strength in the longitudinal direction of the mat. Since the strength is greater than the strength in the width direction of the mat, it is possible to grow seedlings at low cost, and it is easy to handle and transplant the mat seedlings.

[Brief description of drawings]

FIG. 1 is a perspective view of a mat seedling showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a seedling raising state showing an embodiment of the present invention.

FIG. 3 is an enlarged perspective view of a mat seedling showing an embodiment of the present invention.

FIG. 4 is an explanatory view of a seedling raising process showing one embodiment of the present invention.

FIG. 5 is an explanatory diagram of embossed waterproof paper showing an embodiment of the present invention.

[Description of sign]

 1 Seedling box 2 Mat seedling 3 Mat part 4 Floor soil 5 Cover soil 6 Sheet 7 Seedling 8 Paddy 9 Embossed waterproof paper 12 Root 13 Bottom plate 15 Void

Claims (2)

[Claims] 1. The floor soil (4) side is provided with an uneven sheet (6) having water resistance before transplantation and corrosive so as to be corroded after transplantation, and the floor soil (4) side Roots of seedlings (7) grown in
The mats for loading rice transplanters, characterized in that (12) penetrates from the floor soil (4) to the lower side of the sheet (6) and is entangled with each other under the sheet (6). Seedling. 2. The sheet (6) is an embossed water resistant paper (9) formed in an uneven shape by embossing, wherein the strength in the longitudinal direction of the mat is greater than the strength in the width direction of the mat. The mat seedling for loading the rice transplanter according to claim 1.