JPH0523048A - Medium-conditioning agent for raising of seedling - Google Patents

Abstract

PURPOSE:To obtain a medium-conditioning agent for conditioning a raising seedling medium capable of growing soil-stick seedling, having high mechanical strength and resistant to the removal of soil attached to the root in the transplantation of a soil-stick seedling grown in a raising seedling vessel. CONSTITUTION:The objective conditioning agent for raising seedling medium is obtained by adsorbing a water-soluble binder such as polyethylene oxide polymer to a porous mineral substance such as ceramic produced by firing diatomaceous earth having a number of fine pares at a high temperature. The medium conditioning agent can be used as a controlled raising seedling medium free from the dissolution and leakage of a water-soluble binder over a long period by uniformly mixing the agent to a raising seedling medium having a water-content of 25-40%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the transplantation of soil seedlings,
TECHNICAL FIELD The present invention relates to a seedling-growing medium adjusting agent for adjusting a seedling-growing medium capable of growing a soil-grown seedling having mechanical strength, in which the medium adhered to the root does not easily come off.

[0002]

2. Description of the Related Art Conventionally, seedling containers of various shapes have been used to grow soil-grown seedlings used for transplanting vegetables, flowers, paddy rice, etc. After the soil-grown seedlings have been grown, they can be transplanted by a transplanter or manually. It is being transplanted to this field. Transplanting with soil-based seedlings such as these has less root damage and good survival, and does not handle the plant itself at the time of transplantation. It makes it possible easily and brings about the effects such as labor saving. And for raising seedlings with soil such as a seedling raising box, a seedling raising paper cylinder collecting pot, or a seedling raising container such as a synthetic resin frame, conventionally used seedling culture medium is At the time of work, it is used by mixing fertilizer with ordinary soil and adjusting it, and the root pot part used as a handling part for sandwich transportation etc. in transplanting work has been strengthened. However, the root pot portion is easily broken or chipped during the transplanting work, which lowers the efficiency of the transplanting work and causes growth failure after the transplantation. Furthermore, a transplanted seedling lacking a root pot part cannot be mechanically planted, and thus a missing plant is also generated. In addition, soil-grown seedlings are easily crumbled even when transplanting by hand planting work because the root pot part is grasped by hand, especially when the seedling raising period is short and the rooting is insufficient, When using a large diameter pot,
The root pot part is likely to collapse and requires careful handling.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As a seedling-growing medium for such soil-bearing seedlings, the present inventor has previously described in JP-A-62-1
As disclosed in Japanese Patent No. 236416, by adding and mixing a polyethylene oxide polymer in a nursery medium in an amount of 0.1 to 1.5% by weight, without inhibiting the growth of seedlings during nursery,
We proposed a method for preparing a medium that is highly unity and suitable for mechanical transplantation while maintaining air permeability during transplantation.

However, in recent years, in order to save the labor and complexity of adjusting the medium one by one at the start of the seedling raising work, it is required that the seedling raising container can be filled with the adjusted medium immediately after the start of the seedling raising work. In this case, the medium should have an appropriate water content of 25% to prevent dust generation and work.
It is desirable to have ˜40%. That is, if the water content is low, the medium becomes a dry medium and dust rises, and if the water content is high, it becomes a muddy state, which makes the handling difficult and the workability deteriorates. And in the case of the method for adjusting the adjusted medium in which the polyethylene oxide polymer powder is added and mixed, the adjustment is performed immediately before use, and the water content in the medium is 20% by weight or less. Polyethylene oxide polymer powder that is extremely prone to dust rising during use and has a high hygroscopicity and a strong cohesion, and exhibits elasticity and cohesion when the water content is 25 to 40% by weight for dust prevention. Absorbs water in the medium during storage and becomes a dumpling state. Not only does it hinder the uniform dispersion of the medium when filling the seedling-growing container, but it also impairs the effect aimed at making the entire soiled part a good solidified body at the time of transplantation, and in all operations from seedling to transplantation. It will worsen the handling.

[0005]

In order to solve the above-mentioned deficiencies, the present inventor has further added the polyethylene oxide polymer powder mixed medium of JP-A-62-236416 as a medium for soil-implanted seedlings suitable for mechanical transplantation. Even after long-term storage, the polyethylene oxide polymer powder does not form a lump by the water content of the medium, and even when the medium is filled at the start of the nursery work, it can be easily filled into the seedling-growing container while maintaining the smooth state as at the beginning of storage. And, as a result of diligent research on the conditions for solidifying the soil portion by sequentially melting it by irrigation during seedling raising, as a means to measure homogenous dispersion in the medium, mineral porous material was dissolved in water such as polyethylene oxide polymer. After adding a binding agent, the mineral porous substance is uniformly dispersed and mixed in a medium containing a specified amount of water, so that the water content of the medium during storage is water-soluble. There does not melt, the medium can be an adjustment medium without dumpling state of, is obtained by the modifier. That is,
When this adjusting agent is uniformly mixed in the medium, the water-soluble binder impregnated in the pores of the mineral substance has a water content of 25% in the medium.
The present invention has been achieved by discovering that even if the amount is up to 40% by weight, it does not dissolve, and that when seedling containers are filled with a medium and seeded, and then irrigation is started under seedling-raising conditions, the water gradually leaks.

The present inventor used polyethylene oxide polymer powder as the water-soluble binder and used ceramics obtained by firing diatomaceous earth having a large number of fine pores at a high temperature as the mineral porous material. Adsorption is ceramic (bulk specific gravity: 0.
5% by volume of a 10% aqueous solution of polyethylene oxide polymer was adsorbed on 5), and dehydration drying treatment was performed. The attachment ratio of the water-soluble binder to the mineral porous material was about 9% by weight. Mineral porous material 1 with this water-soluble binder attached
10 parts by volume of normal seedling-growing medium mixed with parts by volume and fertilizer is uniformly mixed, and the water content is increased from 15% to 40% in 5% increments.
Each of the adjusted media (A) was prepared and put in a polyethylene bag and stored for 90 days. As a control, polyethylene oxide polymer powder was directly added to a normal medium mixed with fertilizer at 0.5% by weight in the same concentration as above to form a medium (B), which was made into a state of dumpling, generation of dust, and a container for raising seedlings. Comparison was made regarding the uniformity of filling.

[0007]

[Table 1] -------------------------------------------------- ----------------------     Item Medium water content% 15 20 25 30 35 40 -------------------------------------------------- ---------------------- State of dumpling A − − − − − −                    B + + + + + + -------------------------------------------------- ---------------------- State of dust generation A + ± − − − −                    B + ± − − − − -------------------------------------------------- ---------------------- Uniform filling A ○ ○ ○ ○ ○ ○                    B △ × × × × × -------------------------------------------------- ----------------------

(Note) 1. In the state of dumpling and dust generation, a large amount of + is generated, ± is partially generated, -is not generated, and ○ is good, ± is slightly good, and × is bad in the uniform filling state.

As shown in Table 1 above, in the conditioned medium in which the polyethylene oxide polymer powder is simply added to the medium, even if the water content is about 15%, if this is stored, it will absorb the water in the medium. It becomes a dumpling and there is a lot of dust generation. When the water content is 20% or more, dumpling becomes extremely large, and it becomes impossible to fill the seedling-growing container in a uniform state. On the other hand, in the conditioned medium in which the polyethylene oxide polymer was adsorbed on the ceramic and then uniformly mixed with the medium, the lumping phenomenon did not occur even when the water content was 40% by weight, and it showed a very smooth state and showed no dust. There is no occurrence, and the seedling raising container can be filled uniformly. .

The ratio of addition to the medium to which the mineral porous material such as ceramic is added is not specified in particular, but the amount of the water-soluble binder attached is 0. 1-1.5%, preferably 0.2-1.0
% Is the ratio. As the water-soluble binder used in the present invention, polyethylene oxide polymer, polyacrylamide polymer, etc. can be used. These water-soluble binders are usually used as a 2 to 20% aqueous solution and used as a mineral porous material. By dipping or spraying.

[0011]

In the present invention, a mineral porous material such as ceramics is adsorbed with a water-soluble binder such as polyethylene oxide polymer to serve as a medium adjusting agent. Mix evenly to contain water content of 25-40
As a medium for adjusting the seedling dissolution rate that has been set as a percentage, it can be stored for a long period of time, and even when it is used at the start of the seedling raising work, it remains in the same state at the time of adjustment, so filling the seedling raising container will generate dust. Without seeing, the water-soluble binder which was uniformly filled and adsorbed to the mineral porous material by the irrigation during the seedling raising was dissolved and leaked, and the whole medium exhibited the caking property.

[0012]

【Example】

Example 1 “Production of Medium Conditioning Agent and Adjustment of Conditioned Medium for Raising Seedling” 50 kg of Isolite CG-1 (trade name, manufactured by Isolite Industry Co., Ltd.), which is commercially available as a ceramic soil improving material, is used as a mineral porous material, After preliminarily prepared, 50 l of a polyethylene oxide polymer was impregnated in a 10% aqueous solution to be adsorbed, and then air-dried at 70 ° C for 12 hours to obtain 55 kg of a seedling-producing medium adjusting agent of the present invention. Then, as soil containing fertilizer, "Kumiai gardening nursery soil"
(Manufactured by Kureha Chemical Industry Co., Ltd., fertilizer, TN = 200 p.
pm, P2O5 = 1200 p.pm, K2O = 300 p.pm) was adjusted to a water content of 30 to 35%, and 500 Kg of this medium was uniformly added and mixed with 50 Kg of the medium for raising seedlings of the present invention and 550 Kg of medium for raising seedlings. (Containing water content of 30%) was produced and put in a polyethylene bag of 20 kg each and stored indoors.

Example 2 "Lettuce seedling raising test" The adjusted medium for raising seedlings put in a polyethylene bag and stored in Example 1 was taken out after 90 days and put in a seedling raising box for paddy rice (internal method 28 cm x 58 cm x height 3 cm). Cylindrical assembly pot (product name Nitten Paper Pot Standard 11
No., 3.5 cm square × 3.8 cm high × 128 booklet, manufactured by Nippon Sugar Beet Sugar Co., Ltd.) was developed to fill 7 kg per one box. At the time of filling, the polyethylene oxide polymer adsorbed to Isolite CG-1 did not melt even though it contained about 30% of the adjusted culture medium water for raising seedlings, and did not change at all at the time of adjustment, maintaining a smooth state, During the handling of the work, it was possible to uniformly and uniformly fill each of the pots with the medium without dust flying. Next, lettuce seeds (cultivar Olympia) were sown one by one in each pot to bring them to a seedling-raising state, but germination and initial growth were good. .

Twenty-one days after the start of raising seedlings, water was sufficiently watered in the evening of the day before, and a drop test was performed on the strength of the soiled portion for 256 strains for two raising seedling boxes. As a control, a drop test for seedlings grown in a conventional method using a soil-only medium without adding a polyethylene oxide polymer was also conducted for 256 strains in two boxes. The results are shown in Table 2, which shows that the growth by the adjusted medium for raising seedlings using the adjusting agent of the present invention is very good, there is very little collapse of the soil part, and the mechanical adaptability is excellent. there were. .

[0015]

[Table 2] -------------------------------------------------- ----------------------   Item Plant height Leaf number Collapse Collapse maximum Collapse average                          cm Number of shares Weight (g) Weight (g) -------------------------------------------------- --------------------- Medium containing the modifier of the present invention 8.8 3.6 0.6 0.8 0.2 Control conventional medium 8.2 3.1 48.0 27.6 13.2 -------------------------------------------------- ----------------------

[0016]

INDUSTRIAL APPLICABILITY According to the present invention, a water-soluble binder such as a polyethylene oxide polymer, which itself has extremely strong hygroscopicity and becomes caking when it absorbs moisture and is dissolved, is obtained by firing diatomaceous earth at a high temperature. By adsorbing to a mineral porous material having such fine porosity, it is used as a regulator whose melting to water is adjusted, and the water content is 25 to 40%.
As a conditioned medium to a degree, by uniformly mixing and adjusting the adjusting agent of the present invention, at the time of use even after long-term storage, it can be used while maintaining the same state as the time of adjustment, and at the time of filling work into a seedling raising container etc. Dust can be prevented, and very good seedlings can be obtained at the time of transplantation after raising seedlings, and the soiled part does not collapse, so that the transplanting work can be performed smoothly. Further, the adjusting agent of the present invention is uniformly mixed in an ordinary medium in advance and used after storage, but even if it is used without a storage period, the effect is the same as when stored.

Claims (2)

[Claims] 1. A medium-conditioning agent for raising seedlings, wherein a water-soluble binder is adsorbed on a mineral porous material. 2. A water content of 25 to 4 is added by adding a medium adjusting agent for raising seedlings in which a water-soluble binder is adsorbed to a mineral porous material.
Conditioned medium for raising seedlings adjusted to 0% by weight.