JPH04248904A - Self-adhesive tape for sowing and raising seedling - Google Patents

Abstract

PURPOSE:To provide a sowing and seedling-raising means capable of precisely and efficiently sowing a desired number of seeds on a seedling-raising mat or bed at a desired interval without damaging the seedlings and the roots thereof when the seedlings are divided on the setting thereof. CONSTITUTION:In a sowing and seedling-raising adhesive sheet comprising a sheet-like support having a self-adhesive thereon, at least 50% of the constituting component of the supporter comprises alpha-D-1,4-glucan.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an adhesive sheet for sowing and raising seedlings of grains, vegetables, flowers, etc.
The present invention relates to a pressure-sensitive adhesive sheet for sowing and raising seedlings that is suitable for sowing seeds at desired positions with high positional accuracy and efficiency, and for significantly improving sowing workability.

0002

BACKGROUND OF THE INVENTION The sowing of grains, vegetables, flowers, etc. is roughly divided into the following two methods. That is,
One method is the so-called direct sowing method, in which seeds are directly sown in the field, germinated, and grown.The other method is to first sow the seeds on a small seedling mat or nursery bed, germinate, and raise the seedlings, and then place the seedlings in the field. This is a method of planting. Traditionally, seeding was done by hand in any of the above methods, but in recent years, as the number of agricultural workers has decreased and the population has grown older, improving workability has become increasingly important. ing. In addition, in the past, the quality of seeds was uneven, so it was possible to avoid the so-called thinning process of first sowing more seeds than the required number, allowing them to germinate and raise the seedlings, and then removing the other seedlings while leaving high-quality seedlings. There wasn't. However, in recent years, with the introduction of biotechnology to the seed and seedling industry, the quality and germination rate of seeds have dramatically improved due to the use of F1 seeds, and there has been a strong need to significantly reduce the amount of seeds sown. .

The following methods have been proposed for the purpose of improving workability and reducing the amount of seed sown. That is,
(1) A method in which seeds are wrapped in a long water-soluble tape at appropriate intervals and buried in a field; (2) A water-soluble adhesive layer is placed on the surface of a water-soluble support to fix the position of the seeds. A method of wrapping seeds in a long tape at appropriate intervals and burying them in a field (Japanese Unexamined Patent Publication No. 64-51004); (3) enlarging small-diameter seeds with a protective agent to increase particle size and uniform shape; Examples include a method in which the seeds are sown at appropriate intervals using a simple manual seeding machine.

On the other hand, in hydroponic cultivation and rock wool cultivation, whose fields of use have been rapidly expanding in recent years, seedlings are grown at specified intervals on a small-area seedling mat (usually made of urethane foam of about 0.2 m2). The procedure used is to sow a specified number of seeds, germinate and raise the seedlings, and then plant the seedlings. It is common that In particular, when dealing with expensive seeds, it is necessary to sow the desired number of seeds (usually 1 to 3) in the desired position on the seedling mat, so manual sowing is required. I don't get it. Furthermore, in the case of so-called streak sowing, in which seeds are sown in rows at desired intervals on a seedling mat, the sowing is actually done manually. However, when dealing with relatively inexpensive seeds, a method may be adopted in which seeds are sown individually on seedling mats using a simple seeding machine.

[0005] Furthermore, a sheet made of a paper base material on which seeds can be mounted at a desired position has also been developed (Japanese Patent Laid-Open No. 1-296909). However, the water-soluble paper used as a support for this sheet becomes gel-like when watered on the seedling mat, but solidifies when it dries, which has negative effects on the seedlings, such as damaging the roots when dividing the plants during planting. There is a fear.

[0006]

[Problems to be Solved by the Invention] As stated above, even in the so-called plant factory format in which seeding and seedling raising are carried out using seedling mats or seedling beds, sowing is still done manually in many cases. The reality is that In other words, when the method (1) or (2) above is adopted for sowing seeds on the seedling mat, there is a problem with the positional accuracy of seed loading, and the seed loading machine used to wrap the seeds in the tape is expensive. Therefore, it is difficult to put it into practical use. Furthermore, attempts have been made to place seeds on seedling mats by the method (3) above, but the high cost of the seeds has hindered its widespread use. Furthermore, the above-mentioned seeding sheet proposed by the present inventors has the above-mentioned problems, and improvements are currently desired.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to sow a desired number of seeds at desired intervals on a seedling mat or bed with high positional accuracy and efficiency. Another object of the present invention is to provide a means for sowing and raising seedlings that does not damage seedlings or roots during division during planting.

[0008]

[Means for Solving the Problems] The above object is to provide a pressure-sensitive adhesive sheet for seeding and raising seedlings in which an adhesive is provided on a sheet-like support, in which at least 50% of the constituent components of the support are α-D.
This can be achieved by using an adhesive sheet for sowing and raising seedlings made of -1,4-glucan. In this case, the adhesive can be provided on the support in the form of dots, stripes, or patterns.

Paper that has been conventionally used as a support for this type of adhesive sheet is made of fibrous cellulose (composed of β-D-1,4-glucan) using water-soluble polysaccharides as a binder.
is formed into a sheet shape, and when a seedling-raising sheet using this support is immersed in water, the polysaccharide binder is dissolved in water and the fibers become dispersed, so that plant seeds can easily take root. Although this is convenient, once the water evaporates, the remaining fibers become entangled and coagulate again, resulting in the above-mentioned negative impact on seedlings during planting and division.

[0010] On the other hand, the above-mentioned problem can be solved by creating a seeding and seedling-raising sheet using a support mainly composed of α-D-1,4-glucan, which itself is water-soluble.

[0011]

[Function] To further explain the support with the above structure, starch is a typical substance consisting of α-D-1,4-glucan, and water-soluble α-starch and agarose are the main substances. Films made from agar as a component include wafers. Additionally, several edible films made from this type of material have recently become commercially available. These films or films similar to these can be used as a support for the seedling-raising sheet of the present invention. That is, α-D-1,4-glucan,
Alternatively, α-D-1,4-glucan and β-D-1,4-
A film made of a mixture of glucan, mannan, glucomannan, other homoglycans or heteroglycans, or other natural composite polymers containing sugar chains can be used as the support for the sheet of the present invention. According to experiments conducted by the present inventors, in these mixed systems, α
-D-1,4-glucan mixture ratio is at least 50
Gives good results when %. It is also possible to incorporate reinforcing agents into the films described above. In other words, it is also effective to use a film containing a mesh reinforcing material made of water-insoluble fibers for the purpose of making the film easier to handle and preventing the film from shrinking significantly before it comes into contact with water and dissolves. It is. For example, natural fibers such as cellulose fibers are suitable as the above-mentioned fibers. This net-like reinforcing material may be placed in a seed bed and removed after watering, or it may be water-dispersible.

Next, a brief explanation of the adhesive is as follows.
Generally, adhesives exist as solvent-based or emulsion-based adhesives, and when applied to a substrate and dried, they develop adhesive properties that can easily capture seeds. Also,
There are also adhesives that are applied at high temperatures. Many adhesives dissolve in organic solvents, but others dissolve or disperse in water. In the case of the adhesive sheet for sowing and raising seedlings of the present invention, any adhesive can be used.

[0013] By using the sowing and seedling raising sheet of the present invention, a desired number of seeds can be easily mounted on a desired site on the adhesive sheet, regardless of the size and shape of the seeds. In other words, when it is desired to load seeds in a row in a striped manner, the seeds should be loaded in a row on the support with a width corresponding to the size of the seeds and at a desired interval. A pressure-sensitive adhesive sheet coated with a pressure-sensitive adhesive may be used. Also,
If it is desired to mount seeds in dots on a sheet, a pressure-sensitive adhesive sheet may be used in which a plurality of desired areas on a support are coated with a pressure-sensitive adhesive in a desired size and shape. Seeds are loaded onto the adhesive sheet by appropriately scattering the seeds on the adhesive-coated side of the adhesive sheet, and then tilting the adhesive sheet. It is possible to obtain a pressure-sensitive adhesive sheet in which the seeds are removed from the area and the seeds are stuck only to the adhesive-coated area.

[0014] Furthermore, for raising seedlings using the sheet for seeding and raising seedlings constructed according to the present invention, the adhesive sheet with seeds mounted thereon as described above is placed on a seedling raising mat or on a seedling bed, and a small amount of soil is covered if necessary. After that, by allowing water to seep in, the support of the adhesive sheet will dissolve or disperse in the water with the seeds remaining, so that the seeds that have been sown at the desired position on the seedling mat or bed will be Will not damage germination or seedling growth.

The structure of the pressure-sensitive adhesive sheet for sowing and raising seedlings of the present invention has been described above, but it is also possible to add nutritional components for seeds, growth promoters, disinfectants, etc. to the constituent materials.

[0016]

[Examples] The pressure-sensitive adhesive sheet for sowing and raising seedlings of the present invention will be specifically explained below using examples. FIG. 1 is a partially enlarged perspective view showing the structure of an embodiment of the pressure-sensitive adhesive sheet for sowing and raising seedlings of the present invention, and shows that the pressure-sensitive adhesive 2 is coated in dots on a support 1 made of wafer. Moreover, FIG. 2 is a diagram showing a cross section taken along the line A-A' in FIG. 1 when one seed 3 is mounted on each adhesive-coated area of the adhesive sheet in FIG. 1. For example, in order to mount one Komatsuna seed on each adhesive-coated area of the adhesive sheet having the above structure, the adhesive 2 is applied to a predetermined area on the support 1 in a circular shape with a diameter of 1.0 to 1.5 mm. It is sufficient to apply the adhesive to approximately 1.0 mm
It is sufficient to coat a 3.0 mm rectangle.

As one specific application example, a seedling growing mat (made of urethane foam, approx.
00 mm x 600 mm, removable at a pitch of 24 mm vertically and horizontally), an adhesive sheet with wafers loaded with Komatsuna as a support was placed on top of the seedlings for germination, and two weeks later, the urethane foam loaded with seedlings was cut off and planted. As a result, the wafer becomes gel-like when it comes into contact with water, so
Planting could be carried out without significantly damaging the roots of the seedlings.

Next, regarding the case where the adhesive sheet of the present invention loaded with Komatsuna seeds is placed on a seedling-growing sheet, and the case where Komatsuna seeds are sown manually onto a seedling-growing mat.
As a result of spraying water in the form of a mist from above and investigating the germination rate of both methods, the germination rate was 94% when using the manual method, while the germination rate when using the adhesive sheet was 95%, with almost no difference observed between the two. I couldn't.

[0019] Furthermore, the germination rate after watering was determined for cases in which Komatsuna seeds were mounted on the adhesive sheet of the present invention and placed on a nursery bed and then covered with soil, and in cases where Komatsuna seeds were sown directly on the nursery bed and then covered with soil. As a result of comparison, the germination rate of the former was 89%, and the germination rate of the latter was 91%, and in this case, almost no difference was observed between the two.

[0020]

[Effects of the Invention] As described above, by using the adhesive sheet for sowing and raising seedlings as the adhesive sheet having the structure of the present invention,
By solving the problems of conventional technology, it is possible to sow a desired number of seeds at desired intervals on a seedling mat or bed with high positional accuracy and efficiency, and it is possible to sow seeds efficiently when dividing plants during planting. We were able to provide a means for sowing and raising seedlings that does not damage seedlings or roots.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged perspective view showing the schematic structure of an embodiment of the adhesive sheet for sowing and raising seedlings of the present invention.

2] FIG. 2 is a vertical cross-sectional view along line AA' of the state in which seeds are mounted on the adhesive sheet of FIG. 1. [FIG.

[Explanation of symbols]

1...Support, 2...Adhesive, 3...Seed.

Claims (2)

[Claims] Claim 1: A pressure-sensitive adhesive sheet for seeding and raising seedlings, comprising a pressure-sensitive adhesive on a sheet-like support, characterized in that at least 50% of the constituent components of the support consist of α-D-1,4-glucan. Adhesive sheet for seeding and raising seedlings. 2. The pressure-sensitive adhesive sheet for sowing and raising seedlings according to claim 1, wherein the pressure-sensitive adhesive is provided on the support in the form of dots, stripes, or patterns.