JPH05103521A - Method for fertilizing to paddy field - Google Patents

Abstract

PURPOSE:To uniformly feed a solid fertilizer onto the face of paddy field by an easy work in a short time such as several minutes at a low cost by directly charging a solid fertilizer having shape capable of quickly dissolving in water together with irrigation water from water inlet of paddy field to the face of paddy field. CONSTITUTION:A porous or granular solid fertilizer having <=0.8 bulk density is allowed to directly drop from a fertilizer bag to the water inlet of a paddy field, in which irrigation water is flowing, over about 3min to fertilize and electric conductivity of field face water is measured after 3hr when inflow of irrigation water is stopped and when 3 days passed through and it is detected and analyzed that the change flowability of electricity is changed according to an amount of ion dissolved in water and the mount of fertilizer component dissolved in water of rice field is measured. Thereby it is confirmed that the fertilizer is uniformly given to the face of paddy field and the labor of fertilization operation is facilitated to efficiently culture a paddy rice plant, lotus root and rush at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fertilization method for streamlining and labor saving of fertilization such as rice cultivation in paddy fields. More specifically, fertilizer application is characterized in that fertilizer is introduced from a water mouth together with irrigation water. It is about the method.

[0002]

2. Description of the Related Art Conventionally, fertilizers in paddy fields have often used granular or powdered fertilizers, and some liquid fertilizers may be added. When applying a granular or powdered fertilizer, it is usually sprayed directly by hand, and it is necessary to walk through the paddy fields, which requires a great deal of labor to apply fertilizer uniformly. With granular fertilizers, working hours are shortened by using a power spreader, but it is also necessary to walk a ridge by carrying a machine that is quite heavy, it is quite heavy labor, and the machine is expensive. . On the other hand, liquid fertilizer may be applied by an irrigation fertilizer applicator, but this has the same problem as the power spreader.

In recent years, labor-saving fertilization methods have been attempted in which an aqueous solution of a liquid fertilizer or a solid fertilizer is introduced from a water mouth together with irrigation water. For example, a method for mixing fertilizers and pesticides in an irrigation water into a paddy field to apply fertilizer and a device therefor have been devised (JP-A-3-108437). However, liquid fertilizers suitable for such fertilization methods are generally expensive, and their handling for transportation and storage is more complicated than ordinary granular or powder fertilizers, or solid fertilizers are dissolved in water to prepare an aqueous solution. It also takes time to create and use. A fertilizer application method and a liquefaction fertilizer application method have been devised, in which solid fertilizer is gradually semi-liquefied by the water flow in the flowing canal of a paddy field, and is further liquefied and fertilized through the flowing canal (Japanese Patent Laid-Open No. 64-74926). ), The fertilizer application is required also in this case.

[0004]

As in the prior art, mechanization is one means for reducing fertilization labor. However, in the current agricultural environment aiming at low cost, how to apply fertilizer cheaply without using expensive machinery is an important issue. In addition, the aging of agricultural workers is progressing further, and making fertilization work light labor is also an important issue. The problem to be solved by the present invention is to provide a fertilization method from the angle of how inexpensively fertilizer can be applied with light labor.

[0005]

[Means for Solving the Problems] As a result of earnest research on the method of introducing fertilizer together with irrigation water from the mouth of a paddy field, the present inventor is suitable for it, as to how inexpensively fertilizer application can be performed with light labor. The present invention was completed by finding a combination with fertilizer. That is, the present invention relates to a fertilizer application method in which solid fertilizer is directly fed from a water mouth of a paddy field together with irrigation water, and more specifically, it has a bulk specific gravity of 0.8 or less, and has a form in which it rapidly dissolves in water. The present invention relates to a fertilizer application method in which a solid fertilizer having the above characteristics is directly added from the mouth of a paddy field together with irrigation water.

In order to inflow irrigation water from the water outlet of a paddy field, it is common to carry it directly from an irrigation canal or through a pipe by a pump. The fertilization is completed by dropping the solid fertilizer directly from the bag within a short time of a few minutes from the top of the inflowing irrigation water. Since it is important that the solid fertilizer suitable for the present invention is easily dissolved in water, the structure of the fertilizer is generally porous, and its bulk specific gravity is preferably 0.8 or less. The bulk specific gravity of normal granular fertilizer is around 1.

The form of the solid fertilizer may be porous, granular, powdery, or granular as long as it can be dissolved in water promptly, but the porous or granular form is particularly preferable. This is because when the fertilizer has a porous or granular form, it is particularly rapidly dissolved in water. In other words, if the solid fertilizer does not dissolve in water quickly, although it moves a little along the flow of irrigation water, most of it accumulates on the surface of the paddy soil near the mouth of the water, and a large amount of fertilizer is applied only to that part. Not only can fertilizer be applied evenly, but there is a risk of concentration problems in crops near the mouth of the water.

The term "porous" as used herein means a mode in which many spaces are present inside the fertilizer grains, which has the property of being extremely soluble in water. The crop to which the method of the present invention can be applied is not particularly limited, but examples thereof include paddy crops such as paddy rice, lotus root, and rush.

[0009]

[Function] By applying the solid fertilizer as described above to the place where irrigation water is flowing in from the mouth of the paddy field in a short time of several minutes, the fertilizer quickly dissolves and moves on the surface of the paddy field together with the irrigation water. Then, the fertilizer is applied uniformly.

[0010]

EXAMPLES Examples of the present invention will be specifically described below, but the present invention is not limited thereto. Example 1 Porous fertilizer (manufactured by Nissan Chemical Co., Ltd., bulk specific gravity = 0.52) was dropped directly from the fertilizer bag over about 3 minutes to fertilize it for 3 hours while irrigation water was flowing from the mouth of the paddy field. The electrical conductivity of the paddy water was measured after the inflow of irrigation water was stopped and three days later. The electric conductivity is an analytical method for detecting that the flowability of electricity changes depending on the amount of ions dissolved in water, and it is possible to measure the amount of fertilizer components dissolved in rice field water.

The test is conducted in a paddy field of 10 are.
The water depth of the rice field water before fertilization was set to about 2 cm, and the water depth of the rice field water when the inflow of irrigation water was stopped was set to about 8 cm.
As a control example, the same test was carried out using an ordinary granular fertilizer (manufactured by Nissan Chemical Co., Ltd., bulk specific gravity = 0.96) instead of the porous fertilizer. The results are shown in Table 1. With porous fertilizer, there is little variation in the electrical conductivity of rice field water, and it is clear that fertilizer is applied uniformly. On the other hand, it was confirmed that the control fertilizer did not perform uniform fertilization because the electric conductivity of the surface water varied widely.

Further, the paddy rice grown in these paddy fields is
In Example 1, although the growth was uniform, in the control example, a concentration disorder was observed in the paddy rice near the mouth of the water, and the paddy rice at the tail of the water was prone to lack of fertilizer. Table 1 Electric conductivity of rice field water (unit: mS / cm) ─────────────────────────────── Immediately after fertilization Fertilization after 3 days ──────────── ──────────── Mizuguchi Central Mizujiri Mizuguchi Central Mizujiri ─────────────── ─────────────── Example 1 0.37 0.29 0.33 0.31 0.32 0.26 Control example 1.03 0.23 0.15 0.61 0.20 0.12 ────────────────── ──────────── Note) Electric conductivity of irrigation water = 0.08, electric conductivity of rice field water before fertilization = 0.07

[0013]

EFFECTS OF THE INVENTION According to the present invention, it is possible to perform basic fertilization and top-dressing on crops cultivated in paddy fields such as paddy rice, lotus root, and rush, and it is sufficient to drop the fertilizer from the fertilizer bag in a few minutes. It becomes possible to easily shift to light labor. Moreover, since a fertilizer application device is not required, and solid fertilizers that are cheaper than liquid fertilizers can be used, low-cost agriculture is possible.

Claims (3)

[Claims] 1. A fertilizer application method in which a solid fertilizer having a form of rapidly dissolving in water is directly fed into a paddy field together with irrigation water from a water mouth of the paddy field. 2. The fertilizing method according to claim 1, wherein the bulk density of the solid fertilizer is 0.8 or less. 3. The fertilizer application method according to claim 2, wherein the form of the solid fertilizer is porous or granular.