JPH06121624A - Method for raising fruit plant - Google Patents

Abstract

PURPOSE:To provide a method intended to obtain fruits of improved quality (i.e., raised in saccharinity and low in citric acid level) for ligneous or herbaceous fruit plants such as mandarin oranges, apples, grapes or watermelon. CONSTITUTION:A fertilizer is applied around the root foot of a ligneous or herbaceous fruit plant, and the fertilizer applied is covered with an air-permeable waterproof film having each specific air permeability and hydraulic pressure proofness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cultivating a woody or herbaceous fruit plant such as mandarin oranges, apples, grapes and watermelons using a breathable waterproof film, which has improved quality such as sugar content. The present invention relates to a cultivation method capable of obtaining fruits.

[0002]

2. Description of the Related Art Fruits and vegetables are harvested from 1 to 2 months before harvesting, and when water is supplied from the root due to rainfall or the like, water content and respiration in the fruit are increased, resulting in a decrease in sugar content and acidity. Is known to decrease. Therefore, for the purpose of quality improvement, generally, the ground surface is covered with straw before harvesting to shut off water from the soil. However, since the straw has a low water absorption, a great effect has not been obtained.

A method of covering the ground surface with a vinyl sheet is also known, but if it is left covered with a vinyl sheet, since it has no air permeability, carbon dioxide gas generated by respiration fills the underground part, There is a risk that the roots will become suffocated and adverse effects will occur. Therefore, it is necessary to cover the ground surface with a sheet only when it is raining, except for the sheet when the weather is fine, and the sheet is barely spread.

Recently, as a material having waterproofness and air permeability, a nonwoven fabric made of ultrafine synthetic fibers such as polypropylene reinforced with a long fiber nonwoven fabric has been considered, but when this is used as a sheet, It is inevitable that water will seep in between. Further, it is necessary to make the sheet thick in order to reduce the penetration of water, the material cost becomes high, and there is a drawback that it is heavy and inconvenient to handle, and it has not been widely spread. Furthermore, in order to obtain good fruits, fertilizer is applied to the roots of fruit trees, but there is a problem that this fertilizer is washed away in rainy weather, and the work of embedding fertilizer in the soil to prevent this is manual. And costs are required.

[0005]

DISCLOSURE OF THE INVENTION The present invention uses a material that replaces the conventionally used straw or sheet, and has a high sugar content,
It is an object of the present invention to provide a cultivation method capable of obtaining a fruit or vegetable having a reduced citric acid concentration, that is, an improved quality.

[0006]

Means for Solving the Problems The gist of the present invention is to lay a fertilizer around the root of a woody or herbaceous fruit plant, the laid portion having an air permeability of 2000 to 5000 seconds / 100 ml and a water pressure resistance of 1500 mmH. _A method of cultivating a fruit plant, which comprises covering with a breathable waterproof film of ₂ O or more.
The breathable waterproof film used in the present invention is a film that is permeable to air, gas such as water vapor, and impermeable to water droplets (liquid), and is wide as long as it has the above-mentioned performance. It is selected from the range, but the air permeability is 2000
~ 5000 seconds / 100ml, water pressure resistance 1500mmH ₂
A film of O or more is used.

Here, the air permeability is the method specified in JIS-P-8117, the water pressure resistance is the value measured by the JIS-L-1092A method, and the water vapor permeability is the method specified in JIS-Z-0208. If the air permeability is too low, the gas permeability is poor, causing gas damage and damaging the roots, and the fertilizer is not decomposed, resulting in an insufficient fertilizer function. If the water pressure resistance is low, water droplets will soak into the soil and the soil will not be kept in a proper dry state, resulting in less improvement in fruit quality. In addition, it is necessary to make the film thicker in order to increase waterproofness, and the film becomes heavy and thick, resulting in poor handleability. The film thickness is not particularly limited, but is preferably 15 mμ to 50 mμ for practical use. The film material is not particularly limited, but a polyolefin resin film such as polyethylene or polypropylene is usually preferably used.

Such a film can be manufactured by the following method. The polyolefin resin (A) is a homopolymer of ethylene or propylene or a density (ρ) of a homopolymer of ethylene or propylene and a copolymer of ethylene or propylene and another comonomer (a compound having at least one double bond having 4 or more carbon atoms in the molecule). 930 g / cm ³ or less, melt index (MI) 2 g / 10 min or less, polyolefin-based thermoplastic resin such as low density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, density 0.
Ultra low density polyethylene of 910 or less, polypropylene,
Any of ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene-methacrylic acid ester or a mixture thereof may be used, but a linear low density having a density of 0.91 to 0.95 g / cm ³ is preferable. ρ0.930g / cm ³ consisting of polyethylene 50-100 parts by weight and density 0.91 g / cm ³ less than the ethylene -α- olefin copolymer 50-0 parts by weight or less, MI is 2 g / 10
It is a polyolefin-based thermoplastic resin having a content of not more than a minute.

The linear low-density polyethylene is a copolymer of ethylene and another α-olefin, for example, ethylene and its 1-butene of about 4 to 17% by weight, preferably about 5 to 15% by weight, 1-hexene, 1-octene, 1
It is produced by copolymerizing with other α-olefins such as decene and 4-methyl-1-pentene by using the Ziegler type catalyst or Phillips type catalyst used in the high-pressure polyethylene production in the medium and low pressure method. Ethylene-α-
The olefin copolymer is usually a copolymer of ethylene and an α-olefin having 3 or more carbon atoms, and the density thereof is preferably less than 0.91 g / cm ³ , and more preferably 0.85. It is 0.90 g / cm ³ . Examples of the α-olefin having 3 or more carbon atoms to be copolymerized with ethylene include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, and the like, along with them, 1,4-hexadiene, diene Cyclopentadiene,
It is also possible to use non-conjugated dienes such as ethylidene norbornene.

The above-mentioned ethylene-α-olefin copolymer is produced by using a Ziegler-type catalyst, especially a catalyst composed of a vanadium compound such as vanadium oxytrichloride and vanadium tetrachloride and an organoaluminum compound, and ethylene and α-olefin.
-It can be produced by copolymerizing with an olefin, and the ethylene content in the copolymer is in the range of 40 to 90 mol% and the content of the α-olefin is 10 to 60.
It is preferably in the range of mol%. Ethylene-α-
Examples of commercially available olefin copolymers include CdF
Chimie E. P. NORSOFLEX (FW
1600, FW1900, MW1920, SMW244
0, LW2220, LW2500, LW2550); Nippon Unicar Flex Resin (DFDA1137,
DFDA1138, DEFD1210, DEFD904
2); Tuffmer (A4085, A40 of Mitsui Petrochemical Co., Ltd.
90, P0180, P0480), J of Japan Synthetic Rubber Co., Ltd.
SR-EP (EP02P, EP07P, EP57P) etc. are mentioned.

When the density (ρ) of the polyolefin resin (A) used alone or as a mixture is larger than 0.930 g / cm ³ , the synergistic effect of the plasticizer and the radical generator is small and the tear strength cannot be improved. On the other hand, when the MI is more than 2 g / 10 minutes, the tear strength of the film is lowered and the molding stability is lowered.

In the method of the present invention, the melt index (MI) is J which is a reference standard of JIS K 6760.
It is a value measured in accordance with Condition 4 of Table 1 of IS K 7210. In addition, a heat stabilizer, an ultraviolet stabilizer, a pigment, an antistatic agent, a fluorescent agent, etc. may be added to the polyolefin resin according to a conventional method.

Next, as the filler of the component (B), inorganic and organic fillers are used. As the inorganic filler, calcium carbonate, talc, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, calcium oxide, magnesium oxide. , Titanium oxide, alumina, mica, asbestos powder, glass powder, shirasu balloon, zeolite, silicate clay and the like are used, and calcium carbonate, talc, clay, silica, diatomaceous earth, barium sulfate and the like are particularly preferable.

As the organic filler, cellulosic powder such as wood powder or pulp powder is used. These may be used alone or as a mixture. The average particle size of the filler is 30
It is preferably not more than 10 μm, more preferably not more than 10 μm, most preferably 0.8 to 5 μm. If the particle size is too large, the denseness of the pores of the stretched product will be poor, and if the particle size is too small, dispersibility in the resin will be poor and moldability will be poor.

The surface treatment of the filler is preferably carried out from the viewpoint of dispersibility in the resin and further stretchability, and treatment with a fatty acid or its metal salt gives preferable results. The plasticizer as the component (C) is a compound having an ester bond or an amide bond in the molecule and having a molecular weight of 100 or more and a boiling point of 200 ° C. or more and a melting point of 100 ° C. or less at normal pressure.
Examples thereof include oleic acid amide, stearic acid amide, dioctyl phthalate, trioctyl trimellitate and the like.

Preferably, the molecular weight is 350 or more, the boiling point at atmospheric pressure is 250 ° C. or more, the melting point is 50 ° C. or less, and the carbon number is 6
An ester compound composed of the above carboxylic acid and an alcohol having 5 or more carbon atoms, more preferably a molecular weight of 350 or more, a boiling point at atmospheric pressure of 250 ° C. or more and a melting point of 30 ° C. or less, and an aromatic carboxylic acid and carbon number. Ester compounds composed of 6 or more alcohols, for example, DOP, trioctyl trimellitate, DIDP and the like.

When the melting point is higher than 100 ° C., the effect of improving the tear strength due to modification with a radical generator is small, and when the boiling point is lower than 200 ° C., smoke and foaming during molding process lower the molding / stretchability. When the molecular weight is small, bleeding of the plasticizer from the film is undesirably quick.

Next, the radical generator as the component (D) is preferably one having a decomposition temperature in the range of 130 to 300 ° C., which has a half-life of 1 minute, such as dicumyl peroxide.
2,5-Dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-bis (t-
Examples include peroxides such as butylperoxy) -3-hexyne, α, α′-bis (t-butylperoxyisopropyl) benzene, dibenzoyl peroxide, and di-t-butyl peroxide.

The breathable film comprises 100 parts by weight of the above-mentioned polyolefin resin (A) and 100 parts by weight of the filler (B).
˜400 parts by weight, plasticizer (C) 1 to 100 parts by weight, and radical generator (D) 0.0001 to 0.1 parts by weight. If the proportion of the filler (B) is less than 100 parts by weight, the stretched film will not have sufficient pores and the degree of porosity will be low. In addition, the ratio of the filler is 4
If it exceeds 100 parts by weight, the kneadability, dispersibility, film or sheet moldability will deteriorate, and the surface strength of the stretched product will also decrease.

In the present invention, a particularly preferable mixing ratio is 120 to 300 parts by weight of the filler (B) with respect to 100 parts by weight of the polyolefin resin (A). Plasticizer (C)
If it is less than 1 part by weight, the effect of improving the tear strength is not obtained, and if it is more than 100 parts by weight, the kneadability and dispersibility are deteriorated and the film formability is deteriorated and the stretchability cannot be secured. It is preferably 5 parts by weight or more and 50 parts by weight or less.

The radical generator (D) is from 0.0001 to
It is selected from the range of 0.1 parts by weight, and when it is less than this range, the tear strength cannot be improved by the synergistic effect with the plasticizer, and when it is more than this range, the melt index becomes too low, It is not preferable because film breakage is likely to occur during film formation, and roughening of the film surface occurs.

In the present invention, the polyolefin resin (A), the filler (B), the plasticizer (C), and the radical generator (D) are usually added in the above-mentioned amounts, for example, by the following method I or II. After mixing in a ratio, then kneading and pelletizing, inflation molding is performed to obtain an unstretched film. Method I: A polyolefin resin, a filler, a plasticizer, and a radical generator are mixed and kneaded using a kneader such as an extruder or a Banbury mixer, then pelletized, and inflation molding is performed using the pellets. Method II: A large amount of a radical generator 0.5-1% (5000-10000 ppm) is blended with a polyolefin resin, and the mixture is melt-kneaded at a temperature at which the radical generator hardly reacts with the polyolefin and at a temperature higher than the melting point of the polyolefin. The pellet-shaped master batch was prepared in advance, and this master batch was prepared using a polyolefin resin,
Mixing with filler and plasticizer, kneading and then pelletizing,
Inflation molding is performed using these pellets.

When the polyolefin resin is kneaded with the radical generator under heating (preferably at a temperature not lower than the half-life of the radical generator is 10 minutes) according to the method shown in I or II above, the radical generator causes crosslinking. A reaction occurs, the polyolefin is intermolecularly coupled, a high molecular weight component is increased, and a modified polymer having a lowered melt index is obtained. This modified polymer is more likely to be oriented in the lateral direction during inflation molding as compared with the polymer before modification, and thus the film thus obtained has a significantly improved tensile strength and impact strength when stretched. .

To mix the polyolefin resin, the plasticizer, the radical generator and the filler, a drum, a tumbler type mixer, a ribbon blender, a Henschel mixer, a super mixer or the like is used. A mixer of the type is preferred and polyethylene is preferably supplied in the form of a powder, usually 10-150 mesh, especially 20-60 mesh. The kneading of the obtained mixture is carried out using a known kneading device such as a screw extruder, a twin screw extruder, a mixing roll, a Banbury mixer, a twin screw type kneader.

In the present invention, an unstretched film is formed from the above-obtained compound by an inflation method, and then this unstretched film is stretched. Inflation molding has a blow-up ratio (BUR) of 2-8. Preferably, the blow-up ratio is 3 to 6 and the height of the frost line is 2 to 50 times the diameter of the annular slit of the die. More preferably, the height of the frost line is in the range of 5 to 20 times the diameter of the annular slit of the die. When the blow-up ratio is lower than the above range, the tensile strength and impact strength of the film are lowered, and when it is higher than the above range, bubble forming stability is lowered, which is not preferable. Further, if the height of the frost line is lower than the above range, the tensile strength of the film is lowered, and if it is higher than the above range, the molding stability of bubbles is lowered, which is not preferable.

The unstretched film formed by the inflation method is then uniaxially stretched in the machine direction (film take-up direction). The roll stretching method is usually employed for the uniaxial stretching, but the uniaxial direction (the take-up direction) may be emphasized by the tubular stretching method. The stretching treatment may be performed in one stage or in multiple stages of two or more stages. The stretching treatment is performed in the range of a temperature 100 ° C. lower than the melting point of the resin composition to a temperature 20 ° C. lower than the melting point, particularly 9 ° C. lower than the melting point of the resin composition.
It is preferable to carry out in the range of 0 ° C. lower temperature to 50 ° C. lower than the melting point. At a temperature lower than this range, stretch unevenness occurs in the film, and at a temperature higher than this range, the porosity of the film tends to decrease. is there.

The draw ratio must be 1.2 to 8 times, and if it is less than this range, the stretched film has insufficient porosity and tensile strength. On the other hand, if the stretching ratio exceeds 8 times, the film will have excessive molecular orientation in the machine direction, and the surface strength of the film will decrease, which is not preferable. The dimensional accuracy of the film can be stabilized by heat treatment after uniaxial stretching, and known surface treatments such as corona treatment and flame treatment can be applied.

A nonwoven fabric may be attached to the highly flexible porous film obtained by the above method. The non-woven fabric is made of nylon (for example, nylon 6, nylon 66, nylon 12, etc.), polyester (for example, polyethylene terephthalate, polybutylene terephthalate, etc.) or polyethylene, and has a basis weight of 15 to 30 g / m ² . The point density is 60 pcs / cm ^{2 to} 150 pcs / cm ² , preferably about 80 pcs / cm ^{2 to} 120 pcs / cm ² . It is also possible to use a non-woven fabric having a light-reflecting ability by vapor-depositing aluminum or the like on the non-woven fabric. As the polyethylene non-woven fabric, it is preferable to use a polyester fiber as a core material and a fiber having a structure coated with polyethylene.

The porous film and the non-woven fabric are bonded to each other with the following adhesive structure. That is, for example, a method of applying a urethane-based two-liquid type adhesive in a dot shape with an application area (adhesion area) of 10% to 30% and adhering the same. Adhesive dots are 3.18 million pieces / m ^{2 to} 1000
It is about 10,000 pieces / m ² , and the diameter at that point is preferably about 0.1 to 0.5 mm. The dot application of such an adhesive may be performed by, for example, a transfer method using a gravure roll. In the case of a polyethylene-based nonwoven fabric, it is preferable to heat-bond it to the porous film. It is preferable that the adhesion area be approximately the same as above. Even if a non-woven fabric with many voids is used and the entire surface of the non-woven fabric is welded, the proportion of the adhered portion of the porous film may be within the above range. If the heat-bonded area is too large, the pores of the porous film will collapse, so care must be taken.

According to the laminate having the above-mentioned structure, the surface of the porous film has a very small adhesive portion for bonding the porous film and the non-woven fabric, and the surface of the porous film is affected by the thickness of the porous film. The surface becomes very smooth, and as a result, the printing on the surface can be made extremely clear, and the overall feeling is greatly improved without impairing the air permeability.

The non-woven fabric of the above-mentioned laminated body may be a non-woven fabric manufactured by various methods such as spunbonded non-woven fabric and needle punched non-woven fabric. Although the transfer method using a gravure roll is exemplified as the method for applying the adhesive for the adhesion of the both, a spray method or the like can also be used. However, as the adhesive used in this case, it is preferable to use, for example, an EVA adhesive, a rubber adhesive, or an acrylic adhesive.

The film or sheet thus obtained is used to lay a fertilizer on the root of a woody or herbaceous fruit plant and then to cover it. Fertilizers used in the present invention include park compost, pig manure compost, sawdust compost, rice straw compost, chaff compost, paper dust, municipal solid waste compost, beef manure, manure, wood waste deposits, horse dung,
Organic or synthetic fertilizers such as chicken dung, sewer sludge and night soil sludge are used alone or in combination. The amount of fertilizer laid is about 10 g / m ^{2 to} 100 kg / m ² , preferably 10
It is about 0 g / m ^{2 to} 10 kg / m ² . In particular, a fertilizer containing a component called a middle-aged fertilizer, which is obtained by decomposing easily decomposable organic matter, is preferable. After such fertilizer is applied, covering with the above film prevents the fertilizer from flowing out, and since the film is air permeable, the decomposition reaction that makes the fertilizer easily absorbable by the enzyme Be promoted.

Such a porous film or laminate is prepared before harvesting 1
The improvement of the quality of fruits and vegetables, which is the object of the present invention, can be achieved by covering the root of the fruit plant and the ground surface on the upper surface of the root of the plant from 2 months to harvesting. Although the quality improvement effect varies depending on the type of fruit and vegetables, it is specifically to increase sugar content, prevent fruit cracking, improve color gloss and the like. The method of coating is not particularly limited, and a method of uniformly coating the grounded surface with roots so that water droplets do not enter between the sheets is preferable. The type of fruits and vegetables to which the method of the present invention is applied is not particularly limited, and examples thereof include citrus fruits such as mandarin oranges and hassakus, apples, pears, peaches, grapes, melons, watermelons and the like.

[0034]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded. Example 1 (1) Linear low density polyethylene {melt index (MI): 1.0 g / 10 minutes, flow ratio: 19, density:
0.921 g / cm ³ , copolymerization component: 1-butene, copolymerization amount: 10% by weight, melting point: 120 ° C.} was pulverized into 40 mesh powder and 80 parts by weight of ethylene-propylene copolymer (EPR). , EP07P made by Japan Synthetic Rubber Co., Ltd.)
20 crushed to 40 mesh powder
4 parts by weight of dioctyl phthalate as a plasticizer and 2,5-dimethyl-2,5-bis (t-butylperoxy) -3-hexyne as a plasticizer were mixed in a Henschel mixer with stirring. 0.03 parts by weight Add and mix with stirring.

Furthermore, calcium carbonate (average particle size 1.2 μ
m, fatty acid treatment) was added and mixed by stirring. The mixture thus obtained was mixed with a twin-screw kneader DSM-6.
5 (Double Screw Mixer, manufactured by Japan Steel Works, Ltd.) was kneaded and granulated. 40mm this
Inflation molding with φ extruder, thickness 70μm
Was formed into a film. The extrusion conditions are as follows.

Cylinder temperature: 170-190-210-230 ° C. Head and die temperature: 200 ° C. Die diameter: 100 mm Pulling speed: 8 m / min Blow-up ratio: 3 Frost line height: 700 mm Folding diameter: 471 mm

The film thus obtained was slit in the take-up direction and uniaxially stretched by a roll stretching machine. The stretching conditions were as follows. Stretching temperature: 60 ° C. Stretching speed: 11.0 m / min Film thickness after stretching: 30 μm Evaluation of physical properties of the obtained film is as follows. Air permeability 1800 seconds / 100ml moisture permeability 3800g / m ² / 24Hr water pressure resistance> 2000 mm H ₂ O tear strength 60 g / 1 sheet moldability ◎ flexibility ◎ stretchability ◎ evaluation of physical properties were conducted by the following.

1) Water vapor transmission rate: According to ASTM E26-66 (E). 2) Tear strength: According to JIS P 8116, the pulling direction of the film is measured, and the strength per sheet is determined by g. 3) Moldability: visually determined by the following criteria. ◎: Bubble stable, no die line ○: 〃, with die line △: Film width fluctuation ×: Unmoldable

4) Flexibility: The feel of the hand was evaluated according to the following criteria. ◎: Extremely soft ○: Soft △: Slightly hard ×: Hard 5) Stretchability ◎: No cutting, uniform stretching, no stretching unevenness ○: No cutting, stretching unevenness, almost no △: No cutting, stretching unevenness, slightly × : Large uneven cutting or stretching

Two months before the harvest of Satsuma mandarin (Qingdao Wenzhou) (September 1st), park compost (carbon / nitrogen = 25) was scattered at a rate of 1 kg / m ^{2 on} the ground surface around the root of fruit trees. . The above-mentioned polyethylene porous film was laid thereon with 9 m ² per fruit tree. Two months later (November 1st),
The fruits were harvested and examined for quality. The sugar content was measured with a Brix sugar meter and the citric acid concentration was measured with a densitometer. As a result, the sugar content was 13.8 degrees and the citric acid concentration was 0.96.

Example 2 80 parts by weight of the linear low-density polyethylene used in Example 1,
Ethylene-butene-rubber (Mitsui Petrochemical Co., Tuffmer A4085, MI: 3.6 g / 10 minutes, ρ: 0.88
g / cm ³ ) (Tufmer is a trade name) 20 parts by weight, trioctyl trimellitate 6 parts by weight as a plasticizer, and 2,5-dimethyl-2,5-bis (t-) as a radical generator.
0.05 parts by weight of butylperoxy) -3-hexyne,
200 parts by weight of calcium carbonate was used.

Of the molding conditions, the frost line height is 8
A 40 μ film was obtained in the same manner as in Example 1 except that the thickness was set to 00 mm. The physical properties of the obtained film are evaluated as follows. Air permeability 2100 seconds / 100ml moisture permeability 3700g / m ² / 24Hr water pressure resistance> 2000 mm H ₂ O tear strength 50 g / 1 sheet moldability ◎ flexibility ◎ stretchability ◎

Two months before the harvest of Satsuma mandarin (Qingdao Wenzhou) (September 1), sewer sludge (carbon / nitrogen = 12) was sown at a rate of 3 kg / m ^{2 on} the ground surface around the root of fruit trees. . The above-mentioned polyethylene porous film was laid thereon with an area of 8 m ² per fruit tree. Two months later (November 1st),
The fruits were harvested and examined for quality. The sugar content was measured with a Brix sugar meter and the citric acid concentration was measured with a densitometer. As a result, the sugar content was 14.4 degrees and the citric acid concentration was 0.96.

Example 3 80 parts by weight of the linear low density polyethylene used in Example 1 was added to the ultra low density polyethylene (CDF Chemie).
E. P. Company, FW1900, MI: 1.0g / 10
20 parts by weight of ρ: 0.900 g / cm ³ ), 3 parts by weight of diisodecyl phthalate as a plasticizer, 0.02 parts by weight of the same radical generator as in Example 1 and 200 parts by weight of calcium carbonate.

Of the molding conditions, the frost line height is 1
Example 1 except that the stretching ratio was 000 mm and the draw ratio was 2.1 times.
A film of 20μ was obtained in the same manner as in. The physical properties of the obtained film are evaluated as follows. Air permeability 2000 seconds / 100ml Moisture vapor transmission 2500g / m ² / 24Hr Water pressure resistance> 2000mm H ₂ O Tear strength 35g / sheet Moldability ◎ Flexibility ◎ Stretchability ◎

Two months before the harvest of Satsuma mandarin (Qingdao Wenzhou) (September 1), manure (carbon / nitrogen = 20) was sown at a rate of 1 kg / m ^{2 on} the ground surface around the roots of fruit trees. . The above-mentioned polyethylene porous film was laid thereon in an amount of 6 m ² per fruit tree. Two months later (November 1st),
The fruits were harvested and examined for quality. The sugar content was 14 degrees and the citric acid concentration was 0.98 as a result of measuring the sugar content with a Brix sugar meter and the citric acid concentration with a densitometer.

Example 4 The porous film used in Example 1 and a nylon-based spunbonded nonwoven fabric (area weight of 15 g / m ² ) were bonded with a urethane-based adhesive to form a laminate. The adhesive was applied in dots and the adhesion area was 10%. The physical properties of the obtained laminated film are evaluated as follows. Air permeability 2500 seconds / 100ml Moisture vapor transmission 2500g / m ² / 24Hr Water pressure resistance> 2000mm H ₂ O Tear strength 540g / sheet

Two months before the harvest of Satsuma mandarin orange (Qingdao Wenzhou) (September 1), chicken dung (carbon / nitrogen = 32) was scattered at a rate of ² kg / m ^{2 on} the ground surface around the root of the fruit tree.
On top of that, the above-mentioned polyethylene porous film is used for fruit tree 1
4m ^{2 was} laid per book. Two months later (November 1st) fruits were harvested and examined for quality. The sugar content is measured with a Brix sugar content meter.
Moreover, as a result of measuring the citric acid concentration with a densitometer, the sugar content was 14
The citric acid concentration was 0.95.

Example 5 Instead of the non-woven fabric used in Example 4, polyethylene spun-bonded non-woven fabric (core polyester) (unit weight: 15 g / m 2)
² ) and the whole surface of the non-woven fabric were bonded by heat bonding to form a laminate.
The bonded area was 30%. The physical properties of the obtained laminated film are evaluated as follows. Air permeability 4000 seconds / 100ml Water vapor permeability 1800g / m ² / 24Hr Water pressure resistance> 2000mm H ₂ O Tear strength 900g / sheet

Two months prior to the harvest of Satsuma mandarin (Qingdao Wenzhou) (September 1), 1.5 kg / m ² of municipal solid waste compost (carbon / nitrogen = 20) was applied to the ground surface around the root of fruit trees. I scattered it. Fruit tree 1
4m ^{2 was} laid per book. Two months later (November 1st) fruits were harvested and examined for quality. The sugar content is measured with a Brix sugar content meter.
In addition, as a result of measuring the citric acid concentration with a densitometer, the sugar content was 1
It had a citric acid concentration of 0.95 at 4.2 degrees.

[0051]

According to the method of the present invention, after fertilizing,
By covering the ground surface of the roots of fruits and plants with a breathable waterproof film, it blocks rainwater and prevents the flow of fertilizer, while gas and water vapor in the soil pass through the film surface and the ground is in the best dry condition. To maintain high sugar content, low citric acid concentration,
A quality improvement effect such as good coloring can be seen. Further, since the film strength is strong, it is possible to make a thin film, which improves workability and also makes it possible to reduce the manufacturing cost of the film.

Claims (1)

[Claims] 1. A fertilizer is laid around the root of a woody or herbaceous fruit plant, and the laid portion has an air permeability of 2000 to 50.
A method for cultivating fruit plants, which comprises coating with a breathable waterproof film having a water pressure resistance of 1500 mmH ₂ O or more for 00 seconds / 100 ml.