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Method for determining dry land optimum phosphorus application amount

An optimal, dryland technology, applied in the direction of material inspection, soil material testing, etc., can solve the problem of soil phosphorus loss and other issues

Inactive Publication Date: 2009-01-07
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Studies have shown that when soil available phosphorus is higher than a certain level, the potential of soil phosphorus to enter the water body through various means increases, which may cause soil phosphorus loss.

Method used

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  • Method for determining dry land optimum phosphorus application amount
  • Method for determining dry land optimum phosphorus application amount
  • Method for determining dry land optimum phosphorus application amount

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] Such as Figure 1 ~ Figure 2 As shown, take the Sujiatun wheat field in Shenyang City as an example.

[0024] 1) Drawing of the working curve: Take 1 hectare as the unit, randomly select 15 parts of dry land surface soil, air-dry and sieve, mix it with 0-200kg / ha concentration of phosphorus fertilizer for pot test. After fertilization, keep the local Sujiatun field conditions in Shenyang City for about a week, and measure the soil available phosphorus and 0.01MCaCl 2 Solution leaching phosphorus content, plotting soil available phosphorus and CaCl 2 -P relationship curve (see figure 1 ) and the relationship curve between soil available phosphorus increment and soil fertilization amount (see figure 2 ). The soil available phosphorus determination method can be Olsen method, Bray method or Mehlick3 method (Lu Rukun. Soil Agricultural Chemical Analy...

Embodiment 2

[0032] Such as Figure 3 ~ Figure 4 As shown, take the vegetable greenhouse in Damintun Town, Xinmin City as an example.

[0033] Taking 1 hectare as the unit, randomly select 15 parts of dry land surface soil, air-dry and sieve, mix it with 0-200kg / ha phosphorus fertilizer for pot experiment. Keep the local field conditions for about a week after fertilization, and measure the soil available phosphorus and 0.01MCaCl 2 Solution leaching phosphorus content, plotting soil available phosphorus and CaCl 2 -P relationship curve (see image 3 ). Simultaneously draw the relationship curve between soil fertilization amount and soil available phosphorus increment Figure 4 . Then plant the local main vegetable variety cucumber, measure the cucumber yield after harvesting, and draw the relational curve of soil available phosphorus content and cucumber yield (see image 3 ).

[0034] Soil available phosphorus and CaCl 2 The turning point of the -P relationship curve corresponds t...

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Abstract

The invention relates to a method for fertilizing optimal phosphorus amount in a dry land, making sure to meet double requirements of environment and production, namely, the optimal available phosphorus content in soil is finally fixed by a rating curve of the available phosphorus in the soil and CaCl2-p and a turning point of the rating curve of the available phosphorus in the soil and crop production. Then the content of the available phosphorus in the soil which is not fertilized is measured to calculate the difference value with the optimal available phosphorus content, the corresponding fertilizing amount is obtained according to a graph of relation of the fertilizing amount in the soil and the available phosphorus increment in the soil, thus determining the optimal fertilizing amount. The measuring method of the invention can save fertilizer, lower production cost and reduce environmental risk.

Description

technical field [0001] The invention relates to a method for determining the optimum amount of phosphorus application in dry land that can meet the dual requirements of environment and production. Background technique [0002] Phosphorus is one of the limiting factors for eutrophication of water bodies. In recent years, with the development of agriculture, the fertilizer phosphorus put into dry land soil has increased year by year. Studies have shown that when soil available phosphorus is higher than a certain level, the potential of soil phosphorus to enter the water body through various means increases, which may cause soil phosphorus loss. Therefore, only when the available phosphorus in the soil is lower than a certain level can the safety of the relevant water body environment be guaranteed. How to coordinate the relationship between agricultural production and environmental protection, find the optimal amount of phosphorus application, and ensure both economic and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 陈欣赵牧秋史奕周全来温林钦
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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