JP2012044947A - Planting soil for ericaceae plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide planting soil for an ericaceae plant that does not hamper growth thereof even when there is less water supply.SOLUTION: The planting soil for ericaceae plant includes 0.15-0.25 pts.mass of a water-absorbing resin based on 100 pts.mass of the soil.

Description

  The present invention relates to soil for planting azaleas.

  Rhododendrons are plants that are easy to grow, have beautiful flowers, and bloom every year without much effort. In addition, because of its relatively strong adaptability to the environment, it is a plant that can be planted in a wide range of areas and can be easily planted after transplanting, and can be easily shaped by cutting. In addition, since it has been improved from wild species that have grown naturally and many varieties exist, it is possible to select varieties depending on the planting location. Because of having such characteristics, azaleas, especially azaleas or satsuki, which are plants belonging to the genus Azalea, are often used for planting on roadsides or median strips.

  However, when planted on the side of a road or in a median strip, there is a problem that due to the location, there is a problem of reduced labor for plants, especially a decrease in the continuous water supply, resulting in plant wilt and death. . In addition, in the irrigation work by a water truck or the like for avoiding such drying damage, a great amount of cost and labor are required.

  For the purpose of reducing such irrigation work, a water retention agent for agriculture and horticulture in which water-absorbing resin is mixed with soil is known (see Patent Document 1).

JP 63-0668026 A

  However, in the water retention agent for agricultural and horticultural purposes described in Patent Document 1, in the azalea plant, water drainage is required along with elimination of water shortage. This causes a problem such as a decrease in air permeability due to the occurrence of wilting and death.

  Therefore, the subject of this invention is providing the soil for planting the azalea plant which water supply does not inhibit growth at least.

  That is, the gist of the present invention relates to soil for planting azaleas, which contains 0.15 to 0.25 parts by mass of a water-absorbing resin with respect to 100 parts by mass of soil.

  When the azalea plant is planted with the soil for planting of the present invention, the supply of water does not cause at least wilting or death, and can grow for a long time.

The state of the Satsuki seedling 4 weeks after being planted in the planting soil of Example 1 is photographed. The state of the satsuki seedling 4 weeks after being planted in the planting soil of Comparative Example 1 is photographed. The state of the satsuki seedling 4 weeks after being planted in the planting soil of Comparative Example 3 is photographed.

  Examples of the azalea plant according to the present invention include, for example, azaleas such as azaleas, satsuki, rhododendrons and azaleas; Examples include genus plants, cypress plants such as blueberries, cranberries and cowberry. Among these azalea plants, azalea plants are preferable from the viewpoint of high environmental adaptability and strength against pruning, and azaleas or satsuki are more preferable.

  As the soil used for the planting soil for the azalea plant according to the present invention, acidic soil is preferable from the viewpoint of the growth of the azalea plant. For example, red jade soil, pure sand soil, Kanuma soil, and black soil.

  Examples of the water-absorbing resin used in the soil for planting azaleas according to the present invention include, for example, a crosslinked product of an acrylate polymer, a crosslinked product of a starch-acrylate graft copolymer, and a vinyl alcohol-acrylic acid. Cross-linked product of salt copolymer, cross-linked product of maleic anhydride grafted polyvinyl alcohol, cross-linked isobutylene-maleic anhydride copolymer, cross-linked product of partially neutralized polyacrylic acid, saponified product of vinyl acetate-acrylic ester copolymer Etc. Among these water-absorbing resins, a cross-linked product of an acrylate polymer is preferable because it absorbs a large amount of water and can retain the absorbed water in the molecule even when a slight load is applied.

  In addition, there is no limitation in particular in the manufacturing method of the said water absorbing resin, As a manufacturing method, the reverse phase suspension polymerization method, the aqueous solution polymerization method, etc. are mentioned.

  The ability of the water-absorbent resin is evaluated as physiological saline water retention ability. The physiological saline water retention capacity of the water-absorbent resin is preferably 20 to 60 g / g, more preferably 30 to 50 g / g, and still more preferably 35 to 45 g / g. 20 g / g or more is preferable from the viewpoint of eliminating soil water shortage, and 60 g / g or less is preferable from the viewpoint of securing drainage of soil. In addition, the physiological saline water retention capacity of a water absorbing resin is a value obtained by the measuring method as described in the below-mentioned Example.

  The proportion of particles of less than 250 μm in the water absorbent resin is preferably 20% by mass or more, more preferably 20 to 60% by mass, and further preferably 25 to 50% by mass of the water absorbent resin. From the viewpoint of improving mixing of the water-absorbent resin and soil and improving drainage, 20% by mass or more is preferable. In addition, the particle | grain ratio below 250 micrometers of a water absorbing resin is a value obtained by the measuring method as described in the below-mentioned Example.

  The usage-amount of the said water absorbing resin is 0.15-0.25 mass part with respect to 100 mass parts of soil. From the viewpoint of maintaining the water retention of soil and obtaining the effect of labor saving in irrigation work, it is 0.15 parts by mass or more, and from the viewpoint of preventing growth inhibition of azaleas such as root rot due to excessive water and reduced air permeability. , 0.25 parts by mass or less. In azaleas, it is necessary to consider the balance of the amount of the water-absorbing resin because soil drainage is required along with the elimination of water shortage.

  The method for mixing the soil and the water absorbent resin is not particularly limited as long as the soil and the water absorbent resin can be mixed uniformly.

  To the soil for planting azaleas according to the present invention, fertilizers, rooting promoters, medium amount elements, trace elements, mycorrhizal fungi, and the like can be added as long as the effects of the present invention are not impaired.

  Hereinafter, the present invention will be described in more detail based on examples and comparative examples, but the present invention is not limited to only these examples.

<Saline retention capacity of water-absorbent resin>
The physiological saline water retention capacity of the water-absorbent resin was measured and evaluated by the following method.
2.0 g of the water-absorbent resin was weighed into a cotton bag (Membroad No. 60, width 100 mm × length 200 mm) and placed in a 500 mL beaker. 500 g of physiological saline (0.9% by mass sodium chloride aqueous solution, the same applies hereinafter) was poured into a cotton bag at a time, and the physiological saline was dispersed so as not to generate water-absorbent resin mamako. The upper part of the cotton bag was tied with a rubber band and left for 1 hour to sufficiently swell the water absorbent resin. The cotton bag was dehydrated for 1 minute using a dehydrator (product number: H-122, manufactured by Kokusan Centrifuge Co., Ltd.) set to have a centrifugal force of 167 G, and the weight Wa of the cotton bag containing the swollen gel after dehydration ( g) was measured. The same operation was performed without using the water absorbent resin, the wet hourly space mass Wb (g) of the cotton bag was measured, and the physiological saline water retention capacity of the water absorbent resin was determined by the following formula.

  Water retention capacity of water-absorbent resin (g / g) = [Wa-Wb] (g) / mass of water-absorbent resin (g)

<Particle ratio of water-absorbent resin of less than 250 μm>
The proportion of particles of less than 250 μm of the water absorbent resin was measured and evaluated by the following method.
As a lubricant, 0.25 g of amorphous silica (Degussa Japan Co., Ltd., Sipernat 200) was mixed with 50 g of the water absorbent resin.

  A JIS standard sieve was combined from the top in the order of a sieve having a mesh size of 250 μm and a tray, and the water-absorbing resin was put into the combined sieve and classified by shaking for 20 minutes using a low-tap shaker. After classification, the mass of the water-absorbent resin remaining in the tray was calculated as a mass percentage with respect to the total amount, and the value was defined as the proportion of particles less than 250 μm.

[Example 1 and Comparative Examples 1 to 3]
Weigh out 3.6kg of pure sandy soil (manufactured by Yamane Building Materials Co., Ltd.) with a moisture content of 10% as soil, and in a plastic container, Aquakeep SA60N TYPEII (Sumitomo Seika), which is a cross-linked product of acrylate polymer as water-absorbing resin Manufactured by Co., Ltd., saline retention capacity: 41 g / g, particle size distribution (particle ratio of less than 250 μm): 32% by mass) are mixed at the ratio shown in Table 1, and further stirred with a transplanting iron to plant soil. Was prepared. Next, the sample was filled into a 1/5000 aren Wagner pot (Fujimoto Kagaku Co., Ltd.), and a Satsuki seedling (Gunze Green Co., Ltd.) was planted as an azalea plant. At the time of planting, 800 g / pot of irrigation was performed. Five samples were prepared per one kind of planting soil.

[Example 2]
In Example 1, a crosslinked product of an acrylate polymer as a water-absorbing resin to be used was Aquakeep SA60S (manufactured by Sumitomo Seika Co., Ltd., physiological saline water retention capacity: 42 g / g, particle size distribution (particle ratio of less than 250 μm) ): A sample was prepared in the same manner as in Example 1 except that the content was changed to 15% by mass).

  Each sample was placed in a glass greenhouse in Sakai City, Hyogo Prefecture. After planting, water was not irrigated, and rainwater did not fall into the glass greenhouse throughout the cultivation period. Between May and June of 2010, the wilting of Satsuki seedlings was confirmed visually.

The criteria for wilting were as follows.
At the time when either “curvature” of the current branch, “curvature”, “curvature”, or “discoloration (yellowing, browning)” of the current year's leaf occurred, it was determined to be wilt (FIGS. 2 and 2). 3).

  Table 1 shows the percentage (%) of individuals in which wilting was confirmed. The usage rate of the water-absorbing resin in the table is the usage rate (parts by mass) with respect to 100 parts by mass of true sand.

  As is clear from Table 1, when the soil of the examples is used, even if there is no supply of water after planting the Satsuki seedling, wilt and death do not occur over a long period of time, and the Satsuki seedling can be grown for a long time. It has become possible. In particular, in Example 1 using a water-absorbing resin having a particle ratio of less than 250 μm of 20% by mass or more, the growth state was better than that in Example 2 using a particle ratio of less than 20% by mass. . FIG. 1 is a photograph of the state of Satsuki seedlings four weeks after being planted in the planting soil of Example 1.

  On the other hand, when the water-absorbent resin was not used or when the amount used was small (Comparative Examples 1 and 2), many Satsuki seedlings wilted. This is thought to be due to a decrease in the amount of water in the soil. Moreover, also when there was much usage-amount of water-absorbing resin (comparative example 3), many satsuki seedlings wilted. This is probably due to excessive moisture in the soil and a decrease in air permeability. FIG. 2 is a photograph of the state of Satsuki seedlings 4 weeks after being planted in the soil for planting of Comparative Example 1, and “curvature”, “curvature”, “curvature” and “curvature” of the current year branch. It can be seen that "discoloration" has occurred. FIG. 3 is a photograph of the state of Satsuki seedlings 4 weeks after being planted in the planting soil of Comparative Example 3, and the upper left sample in FIG. It can be seen that the “discoloration” occurs.

  The soil for planting according to the present invention enables the growth of azaleas at least for a long period of time, and is preferably used as soil for planting on roadsides, median strips, etc. it can.

Claims (6)

  A soil for planting azaleas, which contains 0.15 to 0.25 parts by mass of a water-absorbing resin with respect to 100 parts by mass of soil.   The soil for planting of Claim 1 whose azalea family plant is an azalea genus plant.   The soil for planting of Claim 1 or 2 whose azalea family plant is an azalea or a Satsuki.   The soil for planting according to any one of claims 1 to 3, wherein the water absorbent resin is a crosslinked product of an acrylate polymer.   The soil for planting of any one of Claims 1-4 whose physiological saline water retention ability of a water absorbing resin is 20-60 g / g.   The soil for planting of any one of Claims 1-5 whose particle | grain ratio of less than 250 micrometers of a water absorbing resin is 20 mass% or more of this water absorbing resin.