Method for determining use quantity of phosphate fertilizer based on available phosphorus in land

Abstract

The invention discloses a method for determining the use quantity of a phosphate fertilizer based on available phosphorus in a land. The method comprises the following steps that step 1, according tothe soil phosphorus level, the land is divided into a phosphorus deficient area, a suitable area and a high phosphorus area, and then the return rate K of the phosphorus in the land in season is determined; step 2, the formula for obtaining the phosphorus requisite amount C and the available phosphorus soil fertility yield of different crops is YOlsen-P through long-term monitoring and research; step 3, according to different soil textures, a correction coefficient A is established; step 4, according to a wheat yield target Yt, a model IP equal to C*(Yt-YOlsen-P)*(1+K)*A is established. By establishing a phosphate fertilizer variable fertilization model and using a phosphorus big data platform, a phosphate fertilizer recommendation system based on the available phosphorus level is developed to achieve precise phosphorus application. The method has the advantages that variable phosphorus application can be carried out, the phosphorus application amount can be accurate to 0.5 kg / mu, thereby reducing the situation that the more phosphate fertilizer or less phosphate fertilizer is applied so that crops can be stably produced.

Description

technical field [0001] The invention relates to the field of phosphate fertilizer application, in particular to a method for determining the amount of phosphate fertilizer used based on land available phosphorus. Background technique [0002] According to the second national soil census, the total area of ​​cultivated land in the country is only 1.827 billion mu, of which only 21% are high-quality cultivated land, 10% are cultivated land with soil organic matter below 0.5%, 59% are phosphorus-deficient land, and 50% are potassium-deficient land. 23%, phosphorus and potassium deficiency accounted for 10%. Empirical fertilization is still used in most areas of my country, and the accuracy of fertilization is not high enough. Under the influence of factors such as phosphate fertilizer prices and agricultural product prices, it is very easy to under- or over-apply in the actual application process, resulting in problems such as crop yield reduction or increase in production cost...

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Problems solved by technology

[0003] The purpose of the present invention is to: in view of the above-mentioned phenomenon that most of the regions still use empirical fertilization, it is very easy to apply less or excessive fertilization in the actual application process, resulting in the problem of crop yield reduction or increased production cost. Phosphate fertilizer usage method

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