JPH09238575A - Storage method for paddy rice seedling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare and store a large amount before a main field transplanting period comes and to reduce capital investment in a large-scale seedling raising center by storing paddy rice seedlings in a dark place in respective prescribed storage temperature range and number of days after the raising of the paddy rice seedlings is ended. SOLUTION: After the raising of the paddy rice seedlings is ended, they are stored in the dark place whose illuminance is less than 500Lux at the storage temperature of 7-13 deg.C, preferably at 7.5 deg.C, for 5-20 days, preferably less than 10 days, and the paddy rice seedlings are stored. Also, it is preferable that a storage period is less than 20 days at the storage temperature of 10 deg.C and the storage period is less than 10 days at the storage temperature of 12.5 deg.C.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for storing paddy rice seedlings used for paddy rice cultivation.

[0002]

2. Description of the Related Art Conventionally, as a paddy rice seedling, the seedling raising period is 20 to
Saplings with a leaf age of 2.0 to 4.0 in about 22 days, and medium seedlings with a leaf age of 3.5 to 4.5 in about 35 to 40 days,
4.5-5.5 when the seedling raising period is about 45-50 days.
Leaf-aged adult seedlings have been used according to the situation in the rice-growing region. The conventional basis of seedling production is to grow seedlings sufficiently and then transplant them to Honda, and after transplanting, grow them exclusively by external fertilizer and self-nutrition by carbonic acid assimilation.

Recently, as seedlings for rice, milk seedlings having a seedling raising period of about 5 to 8 days and a leaf age of 0.5 to 1.5 have attracted attention (Japanese Patent Laid-Open No. 4-349821). Conventionally, even a young seedling, which has the shortest seedling raising period, required 3 weeks, as compared to the one-week seedling that can be raised in an extremely short period of time, which makes it possible to significantly reduce labor and cost for raising seedlings. . Also,
The turnover of equipment is high for producing a large amount of seedlings at the nursery center, and the productivity is significantly improved.

As described above, milk seedlings are a useful technique for reducing the cost of raising seedlings, but due to the liberalization of rice imports and sales, the drastic reduction in rice production costs is an urgent task for survival. ing. Therefore, rice producers are demanding further reduction of seedling raising costs.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for storing paddy rice seedlings which can further reduce seedling raising costs.

[0006]

Means for Solving the Problems As a result of intensive studies to solve such problems, the present inventors have found that the seedlings can be stored in a cool and dark place under certain conditions, and have completed the present invention. That is, the present invention provides a method for storing paddy rice seedlings, which comprises storing the paddy rice seedlings in a dark place at a storage temperature of 7 to 13 ° C for 5 to 20 days after the raising of the seedlings.

About half of the endosperm nutrient of seed rice remains in the milk seedling, and it grows with the residual endosperm nutrient for a while after the transplantation to Honda. In other words, the seedlings have the ability to survive for a short period of time without supplementation of nutrients from the outside. The present invention utilizes this property, and even if it is stored in a cool and dark place, it does not die or its survival at the time of transplanting Honda is not substantially reduced. In contrast,
10% of the remaining endosperm is the typical representative seedling of the past.
There is almost no remaining below, and the growth is temporarily stopped after the transplantation of Honda and until the fertilizer sucks up and becomes active. Therefore, the seedlings had to be transplanted to Honda immediately after the seedlings had been made, and it was not even attempted to store the seedlings and take them out at the required time and transplant them to Honda.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The storage technology for milk seedlings of the present invention will be described in detail below. The seedlings referred to in the present invention have a seedling height of 7
~ 9 cm, endosperm residual rate is 35% or more, preferably 50%
The above seedlings. Such seedlings are seeded with an inorganic fiber molding medium such as rock wool, a synthetic resin molding medium such as a urea resin, a pulp molding medium, an artificial medium such as a non-woven medium, as well as a natural soil or a granular soil for granulating the same. 200 ~ 500g seeds per box in a floor and stored in a nursery box
After sowing and covering the soil in multiple layers, warm it to about 30 ° C for about 48 hours to germinate it, and vegetate it at about 1 cm for 5 to 8 days after sowing without greening or greening. It can be produced by raising seedlings to a leaf age of about 0.5 to 1.5 and a seedling height of about 7 to 9 cm. The growth of seedlings varies depending on the seedling raising temperature, but preferably 1.3 to 1.
It is preferable to transplant a 9-year-old, especially about 1.5-leaf-old milk seedling to Honda. The leaf age does not include sheath leaves and incomplete leaves, and is counted from the first true leaf.

The growth characteristics of milk seedlings are faster than those of nursery seedlings and middle seedlings, resistant to submersion, submergence, and deep planting. Since the seedlings grow quickly, tillers are started from lower nodes and the growing period of Honda is prolonged. For example, the reduction of the basic fertilizer (immediate-effect nitrogen) to suppress overgrowth promotes rooting and preferential growth. Milk seedlings stored according to the present invention will seldom lose their growth characteristics.

According to the present invention, the milk seedling has a temperature of 7 to 13
It can be stored in a cool and dark place at ℃ and illuminance of 500Lus or less. If the storage temperature is lower than 7 ° C, the mortality rate of the seedlings after transplantation becomes high even after short-term storage, and if it is 5 ° C, the mortality rate becomes 100% in 10 days. When the storage temperature exceeds 13 ° C, the seedlings grow during storage and the endosperm nutrients are consumed, so that the characteristics of the seedlings are impaired. If it is spread and the storage temperature is 7 ° C or higher, for example 7.5 ° C, the mortality rate is 100%.
If it is 5 days and 10 ° C, the storage period will be 20 days. The storage temperature is preferably 9 to 11 ° C, and 10 ° C is a good guideline for management.

Further, the illuminance during storage may be the normal illuminance at the time of raising seedlings, that is, 500 Lux or less, and does not adversely affect the seedlings even in the dark.

Therefore, if the daytime minimum temperature is 7 ° C., it may be stored in a cool dark place where sunlight is not exposed, and if the daytime minimum temperature exceeds 13 ° C., it is desirable to store it in a refrigerator at 10 ° C. .

[0013]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

A rockwool molding medium (Nippon Steel Chemical Co., Ltd., Chibico Power Mat) was used as a seedling raising medium, and 200 g of germinated paddy was sown with 200 g of dry paddy (rice paddy variety Koshihikari) per seedling raising box. Cover the soil with artificial soil for about 1 cm and put it in the seedling raising device. 3
2 ° C for 2 days, 27 ° C for 3 days (illuminance is 500 Lux each)
Raised seedlings. The milk seedlings at the end of raising the seedlings had a leaf age of 1.1 and a plant height of 7 to 8 cm.

Storage of milk seedlings The above milk seedlings were stored under different temperature conditions (12.5 ° C., 10
℃, 7.5 ℃, 5 ℃, illuminance is 500Lux) and different light conditions (dark, 50Lux, 100Lux, 500Lux,
Temperature is 10 ℃ each, 5 days, 10 days, 15 days, 2
Each was stored for 0 days.

Transplantation of stored milk seedlings The above-mentioned stored milk seedlings were placed in a 1 / 5000a Wagner pot.
Four plants were planted with one plant and two pots were planted per treatment group.
After transplanting the pot, the day / night temperature is 25/20 ℃ and 20/15
It was put in a natural light type artificial weather room at ℃ and grown for 20 days. In addition, as a comparative example, a milk seedling immediately after the completion of seedling growth was similarly grown.

Growth Results of Stored Milk Seedlings Fig. 1 shows the composition of the test section, Fig. 2 shows the effect of the storage temperature on the seedling quality during transplantation, and Fig. 2 shows the effect of the seedling storage temperature on the growth after transplantation (25/20 ° C). Table 1 shows the transplantation section), and Table 2 shows the effect of the light condition of the seedling storage period on the growth after transplantation (25/20 ° C transplantation section). In FIG. 1,
The object shows a comparative example, and the hatched portion shows the storage period.

[0018]

[Table 1]

The following was considered from FIG. 2 and Table 1.
First, when the storage temperature was 12.5 ° C, the seedlings grew even during the storage period, and the leaf age was 1.5 and the seedling height was 10.
The number of roots is 4 cm and the number of roots is 6.7.
The leaf blades were slightly elongated, but when the temperature became 7.5 ° C or lower, the growth of the seedlings almost stopped. However, neither atrophy nor death of the seedlings was observed. 1 at storage temperatures of 7.5 ° C and 5 ° C
100% mortality occurred after storage for 0 days or more. Also,
At 7.5 ° C. and 5 ° C. storage, even if no mortality was observed, there was a tendency that the survival was delayed and the initial growth was inferior. 1
Seedlings at the end of raising seedlings (target area) at 2.5 ° C and 10 ° C storage
The survival time was slightly inferior to that of No. 1, but the effect of storage period was not clearly observed.

[0020]

[Table 2]

Further, the following consideration was made from Table 2. The seedling traits at the end of raising the seedlings were almost the same as in FIG. Similar to FIG. 1, the third leaf tended to expand slightly, but the effect of illuminance was hardly observed. Also, after transplantation, 50-
A part of the seedlings died in the storage area at 500 Lux for 15 to 20 days, but the effect of illuminance during the storage period on survival and initial growth was hardly observed.

[0022]

As described above, milk seedlings have a storage temperature of 10
Storage at 20 ° C. for 20 days and storage at 12.5 ° C. for 10 days is possible, and there is no need to particularly irradiate light during the storage period. Therefore, a large amount of milk seedlings can be prepared before the Honda transplanting time, and the production cost of rice seedlings can be significantly reduced. In particular, it will also be possible to reduce capital investment at large-scale nursery centers.

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[Procedure amendment]

[Submission date] July 24, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Added

[Correction contents]

[Brief description of drawings]

FIG. 1 is a drawing showing a structure of a test section.

FIG. 2 is a drawing showing the effect of storage temperature on seedling quality during transplantation.

Claims (5)

[Claims] 1. A storage temperature of 7 to 1 after the raising of paddy rice seedlings is completed.
A method for storing paddy rice seedlings, which comprises storing in a dark place at 3 ° C. for 5 to 20 days. 2. The method for storing paddy rice seedlings according to claim 1, wherein the storage temperature is 7.5 ° C. and the storage period is 10 days or less. 3. The method for storing paddy rice seedlings according to claim 1, wherein the storage temperature is 10 ° C. and the storage period is 20 days or less. 4. A storage temperature of 12.5 ° C. and a storage period of 10
The method for storing paddy rice seedlings according to claim 1, which is within one day. 5. The method for storing paddy rice seedlings according to claim 1, wherein the illuminance in a dark place is 500 Lux or less.