JP2010037182A - Liquid fertilizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new liquid fertilizer having phosphorous acid as the component. <P>SOLUTION: An aqueous solution is obtained by mixing 20-40 pts.mass of phosphorous acid and 10 pts.mass of an alkaline compound. Monopotassium phosphate may be added. Since the presence of the alkaline compound results in a greater pH value (i.e. shifted to the alkaline side) of the aqueous solution than that of an aqueous solution of phosphorous acid alone, the aqueous solution dissolves phosphorous acid at a higher concentration than the one containing only phosphorous acid. The solution, therefore, makes a liquid fertilizer containing phosphorous acid at a high concentration. The liquid fertilizer may be used without being diluted or after being diluted e.g. 10-1,000 times. Foliar application and root drench are possible. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention belongs to the technical field of liquid fertilizers.

  Phosphorus (P) is known as one of the three elements of fertilizer, and has been used in the form of phosphoric acid, phosphorous acid, and the like. Known fertilizer effects of phosphate fertilizer include rooting / sharing promotion, fruit set / coloring promotion, cell skin (film) hardening, and disease resistance enhancement.

  Japanese Patent Application Laid-Open No. 2006-28000 discloses a technique of using an aqueous solution containing phosphorous acid as a fertilizer.

JP 2006-28000 A

When an aqueous solution of phosphorous acid is sprayed on the leaf surface, it is absorbed directly from the leaf surface, and in this respect, it can be said that the spraying efficiency is good.
On the other hand, there were cases where the concentration was unsatisfactory simply by preparing an aqueous solution of phosphorous acid.

The liquid fertilizer according to claim 1,
With phosphorous acid,
It is an aqueous solution in which an alkaline compound is used as a solute.

The liquid fertilizer according to claim 2
The liquid fertilizer according to claim 1, wherein the liquid fertilizer is an aqueous solution containing not only the two components but also monopotassium phosphate as a solute.

The liquid fertilizer according to claim 3
The liquid fertilizer according to claim 1 or 2, wherein the blending ratio of the alkaline compound in the entire liquid fertilizer is 4 to 10% by mass.

The liquid fertilizer according to claim 4 is:
The liquid fertilizer according to claim 1, wherein phosphorous acid is 20 to 40 parts by mass when the alkaline compound is 10 parts by mass.

The liquid fertilizer according to claim 5 is:
The liquid fertilizer according to claim 3 or 4, wherein phosphorous acid is 20 to 30 parts by mass when monopotassium phosphate is 10 parts by mass.

The liquid fertilizer according to claim 6 is:
The liquid fertilizer according to any one of claims 1 to 5, wherein the alkaline compound is calcium hydroxide.

The alkaline compound used in the present invention is a compound in which the aqueous solution becomes alkaline, and needless to say, it is water-soluble.
As a specific example, the calcium hydroxide of Claim 6 can be mentioned. Metal hydroxides such as sodium hydroxide and potassium hydroxide are also suitable. A plurality of types of alkaline compounds can be mixed.

  In an aqueous solution containing phosphorous acid and an alkaline compound as a solute, the pH value is larger than that of an aqueous solution of phosphorous acid alone (ie, displaced to the alkaline side) due to the presence of the alkaline compound. Then, phosphorous acid can be dissolved at a higher concentration than in the case of phosphorous acid alone.

  In the liquid fertilizer according to claim 1, a fertilizer component may be added in addition to the two components of phosphorous acid and an alkaline compound. The monopotassium phosphate according to claim 2 is an example. Monopotassium phosphate has a fertilizing effect as a phosphate fertilizer and potassium fertilizer.

The preferable blending ratio of monopotassium phosphate is preferably the blending ratio according to claim 5, that is, the range in which phosphorous acid is 20 to 30 parts by mass when the monopotassium phosphate is 10 parts by mass.
Since the liquid fertilizer of the present invention is basically a phosphite fertilizer and the alkaline compound is an auxiliary agent, it is not preferable that the mixing ratio is excessive or too small. Although it depends on the kind of the alkaline compound to be used, generally, the blending ratio according to claim 3, that is, the blending ratio of the alkaline compound in the entire liquid fertilizer is preferably 4 to 10% by mass.

Moreover, the preferable compounding ratio of an alkaline compound can also be prescribed | regulated by the ratio with phosphorous acid, In that case, when the compounding ratio of Claim 4, ie, 10 mass parts of alkaline compounds, phosphorous acid is 20- A range of 40 parts by mass is preferred.
[Example]
A liquid fertilizer was prepared with the blending ratio shown in Table 1 below. Although this liquid fertilizer may be used without being diluted as it is, it is usually used in a form in which it is diluted 10-fold to 1000-fold and applied to the foliar surface or irrigated to the base.

［施用実験］
実施例（表１）の液体肥料をウンシュウミカンに施用して、その果実品質に及ぼす影響を調査した。
試験方法
１）供試品種：「青島温州」 青島温州２８年生樹（交互結実、シートマルチ栽培樹）
２）試験区：散布区（実施例の液体肥料の１０００倍希釈液を散布）、無処理
３）散布月日：２００８年１０月２０日、１０月２９日、１１月７日、１１月２０日
４）処理区：樹冠散布；１区１樹６反復
５）調査日：収穫；１２月２２日 着色、果汁内容；１２月２５日 果皮障害果；１２月２８日
６）調査結果：表２に示す通り。

[Application experiment]
The liquid fertilizer of an Example (Table 1) was applied to Satsuma mandarin, and the influence on the fruit quality was investigated.
Test method 1) Test variety: “Qingdao Wenzhou” Qingdao Wenzhou 28-year-old tree (alternative fruiting, sheet cultivated tree)
2) Test plot: spray plot (spread with 1000-fold diluted liquid fertilizer of the example), no treatment 3) spray date: October 20, 2008, October 29, November 7, November 20 Day 4) Treatment area: tree spraying; 1st area 1 tree 6 repetitions 5) Investigation day: Harvest; December 22 Coloring, fruit juice content: December 25 Pericarp fruit; December 28 6) Investigation result: Table 2 As shown in

表２に示すとおり、実施例の液体肥料には糖度向上効果及び浮皮軽減効果が認められた。

As shown in Table 2, the liquid fertilizer of the examples was found to have an effect of improving sugar content and an effect of reducing skin float.

Claims (6)

With phosphorous acid,
A liquid fertilizer characterized by being an aqueous solution having an alkaline compound as a solute.   The liquid fertilizer according to claim 1, wherein the liquid fertilizer is an aqueous solution containing monopotassium phosphate as a solute in addition to the two components.   The liquid fertilizer according to claim 1 or 2, wherein the compounding ratio of the alkaline compound in the entire liquid fertilizer is 4 to 10% by mass. The liquid fertilizer according to claim 1, 2, or 3, wherein phosphorous acid is 20 to 40 parts by mass when the alkaline compound is 10 parts by mass. The liquid fertilizer according to claim 3 or 4, wherein phosphorous acid is 20 to 30 parts by mass when monopotassium phosphate is 10 parts by mass.   The liquid fertilizer according to any one of claims 1 to 5, wherein the alkaline compound is calcium hydroxide.