JPH09154405A - Raising seedling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain uniformly grown seedlings liable to be affected by clubroot and suitable for mechanical transplantation by using a seedling bed block having a specific construction and raising the seedlings under condition resistant to the clubroot infection. SOLUTION: A cylinder made of a biodegradable sheet having air- permeability and water-permeability (e.g. a natural paper sprayed with a polyethylene resin for bonding) is filled with a slightly alkaline culture soil (preferably pH 7.5 or below) to form a seedling bed block. Seeds of a plant liable to be affected by clubroot (preferably a cruciferous plant such as Chinese cabbage) are sowed on the seedling bed and germinated and grown on the slightly alkaline soil. The slightly alkaline soil can be prepared by adding calcium carbonate to a medium composed of peat moss, perlite, etc. In the case of transplanting a raising seedling block holding a grown seedling, it is preferable to plant the block in a state to protrude the upper face of the block beyond the soil surface of the field to prevent the intrusion of contaminated soil into the block even if the soil of the field is contaminated with clubroot nematode.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for raising seedlings of a plant susceptible to root-knot disease, and more particularly to a method for raising seeds of cruciferous vegetables such as Chinese cabbage and cabbage and flowers.

[0002]

2. Description of the Prior Art In rapeseed cultivated plants such as Chinese cabbage and cabbage, when it is contaminated with a root-knot disease fungus, which is a type of filamentous fungus and belongs to the deformed fungi, root-knots are generated in the main roots of the plants and the heads are not formed. In the past, as a measure against root-knot disease, it was effective to adjust the hydrogen ion index (pH) of the field soil to 7.2 or more, and paper pot raising was effective. Handbook ”(published by the Agriculture Research Center of the Ministry of Agriculture, Forestry and Fisheries).

[0003]

[Problems to be Solved by the Invention] However, it is extremely difficult in practice to improve the pH of the entire soil in a field having several are to a pH of 7.2 or more, and it is cultivated in the same field. It is not realistic because it affects other cultivated plants. Also, in seedlings grown in paper pots, roots are hard to come out, so the paper pots must be removed at the time of transplantation, the soil in the pots is easy to dry, and since the pots are connected, the medium in each pot is breathable and There is a problem that the transplanting efficiency is poor because the cultivation conditions vary due to the difference in water permeability and the quality of the cultivated seedlings is poor, and it is not suitable for mechanical planting when transplanting to the field and must be manually planted. there were.

The present invention has been made in view of such a point, and is a seedling raising method for raising seedlings suitable for actual work and having uniform growth during seedling raising work and suitable for mechanical planting work. The purpose is to provide.

[0005]

In order to achieve the above-mentioned object, the present invention forms a nursery block by filling a tube made of a biodegradable sheet material having air permeability and water permeability with a slightly alkaline soil. However, this seedbed block is sown with seeds of plants that are susceptible to root-knot disease such as cruciferous cultivated plants, and germinated and raised in slightly alkaline soil.

[0006]

In the present invention, the medium for sowing seeds is filled with microalkaline medium in a cylinder formed of a biodegradable sheet material with aeration and water permeability, so that seedlings can be raised under conditions that are difficult to be infested by root-knot fungi. Since each medium is independent at the time of raising seedlings, the growth environment of each cylindrical medium can be made uniform and it is suitable for mechanical planting.

Further, since the tubular body is formed of the biodegradable sheet material, it is separated from the soil in the field for a certain period until the biodegradable sheet is decomposed when transplanted in the field. The alkalinity can be maintained and the main roots can be grown without being affected by root-knot fungus. Moreover, even during that time, water can be expected to move with the soil in the field, which facilitates cultivation management.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A biodegradable sheet material that is decomposed by soil bacteria. It is a short sheet of peat moss, perlite, vermiculite, or soil that is adjusted to pH 7.2 by mixing calcium carbonate with the soil. A seed bed block of a columnar cylinder is formed, and each seedling of Chinese cabbage is sown on each of these tubular seed bed blocks, and the seed bed seeded seed block is formed in a plastic tray in the pocket, the bottom of which is slightly away from the bottom of the pocket. Place in a floating state. The pockets formed in this plastic tray are formed in a plurality of rows and a plurality of columns, and the nursery blocks are arranged in alignment with the plastic tray. Then, the seedlings are allowed to germinate while being placed on this plastic tray, and seedlings are raised to a certain size.

During this seedling raising period, since the seedling raising block floats from the bottom surface of the plastic tray, the seedling raising block does not have excess water, and the outer peripheral portion of the seedling raising block is exposed to the outside air and sunlight. Also, since the side roots do not protrude from the biodegradable sheet material forming the side wall of the seedling-growing block, the roots grow in the slightly alkaline seedling-growing block.

A seedling-growing block grown to some extent on a plastic tray is transplanted to a field. In this case, the seedling-growing block is set on the soil of the field so that the upper end of the seedling-growing block projects from the soil surface of the field. When the upper end surface of the seedling-growing block thus protrudes from the soil surface in the field, even if the soil in the field is contaminated with root-knot fungus, the contaminated soil will not enter the seedling-growing block and the seedling-growing block will not. The medium environment inside can be kept slightly alkaline, and it is possible to suppress the generation of lesions at the root.

Then, the seedling-growing block transplanted to the field is gradually decomposed by microorganisms in the field soil, and eventually the medium in the seedling-growing block and the field soil are integrated, but the biodegradable sheet material is used. Until the medium is completely decomposed, the medium in the nursery block and the soil in the field are kept partitioned by the biodegradable sheet material, so that the medium in the nursery block can be kept in a clean medium. Moreover, since the biodegradable sheet material forming the seedling-growing block has water permeability, the biodegradable sheet material can receive moisture from the field soil, and therefore the inside of the seedling-growing block is not dried.

[0012]

[Example] As a biodegradable sheet material, a natural paper sprayed with a polyethylene resin for adhesion was used, and 100 g of calcium carbonate was added to 1 Kg of the medium and mixed to form a soil of pH 7.2. Wrap it in the sheet material,
A cylindrical nursery block having a diameter of 3 to 4 cm and a length of 4 to 6 cm was formed. Chinese cabbage seeds were sown on this seedling-growing block, and the seedling-raising seedling blocks were aligned on a plastic tray, and water was irrigated to such an extent that the soil was not dried to raise seedlings. 9
Taking Chinese cabbage harvested in December and harvested in December as an example, 3
Germination was carried out in the day, and the seedlings were grown until 17 to 22 days after germination and transplanted to the field. The pH of the seedling-growing block at the time of this transplant was 7.5. Chinese cabbage heading started 25 days after transplantation and was harvested 50-60 days after transplantation.

In the above cultivation method, at the time of transplantation, at the time of heading,
As a result of observing each root part at the time of harvesting, it was not possible to observe root mungles at the time of transplantation, and it was not possible to observe root mounds conspicuous on the main root at the time of heading and at each time of harvesting.

The diameter of the seedling-growing block is preferably about 3 cm to 4 cm in relation to the growth of roots, and the length of the seedling-growing block is preferably about 4 cm to 6 cm. In addition, the pH of the medium was adjusted to 7.2 in the above examples, but this medium has a pH of 7.
It may be a fine alkali of 5 or less. Further, as a cultivated crop to which the present invention can be applied, in addition to the above Chinese cabbage, plants susceptible to root-knot disease of cruciferous plants represented by cabbage and broccoli are considered.

[0015]

INDUSTRIAL APPLICABILITY In the present invention, the medium for seed sowing is filled with the microalkaline soil in the cylindrical body formed of the biodegradable sheet material with aeration and water permeability, so that it is difficult to be invaded by root-knot fungus. It is possible to raise seedlings, and since each medium is independent at the time of raising seedlings, the growth environment of each tubular medium can be made uniform. As a result, the utilization efficiency of seedlings can be improved. Furthermore, since the seedling-growing blocks are independent of each other, they are suitable for mechanical planting, which can improve the transplanting efficiency and reduce the load during transplanting work.
Further, after planting in the field, since the biodegradable sheet material forming the nursery block has water permeability, it is possible to receive water transfer from the field soil, and Management can be easily performed, and cultivation management can be easily performed. Moreover, even after planting the seedlings in the field, until the biodegradable sheet forming the seedling-growing block decomposes and disappears, the medium part in contact with the root of the cultivated crop is isolated from the field soil. Therefore, the medium with which the roots of the cultivated crops come into contact can be maintained in a slightly alkaline state regardless of the degree of soil contamination in the field. As a result, the seedlings are not infested by root-knot fungi even after planting, the harvesting efficiency can be improved, and the soil in the field is not improved, which is suitable for actual work. Furthermore, since the biodegradable sheet can be formed by adjusting the decomposition period, it is possible to use a biodegradable sheet material suitable for the cultivated crop.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isokirou 62 Kanda, Momoyama-cho, Naga-gun, Wakayama Prefecture

Claims (3)

[Claims] 1. A seed bed block is formed by filling a tube made of a biodegradable sheet material having air permeability and water permeability with a slightly alkaline soil, and seeds of a plant susceptible to root-knot disease are formed on the seed bed block. A seedling raising method in which seeds are sown and germinated and raised in slightly alkaline soil. 2. The slightly alkaline medium has a hydrogen ion index of 7.
The seedling raising method according to claim 1, which is 5 or less. 3. The seedling raising method according to claim 1, wherein the plant susceptible to root-knot disease is a cruciferous plant.