Method for determining dry land optimum phosphorus application amount

Method for determining dry land optimum phosphorus application amount

  • CN 101,339,183 B
  • Filed: 07/06/2007
  • Issued: 03/12/2014
  • Est. Priority Date: 07/06/2007
  • Status: Active Grant
First Claim
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1. a method for definite dry land optimum phosphorus application amount, is characterized in that:

  • 1) drafting of working curve;

    take 1 hectare as unit, choose at random 10-20 part dryland soil itself and phosphate fertilizer are mixed to get to the soil containing the phosphate fertilizer of the gradient concentration of 20-50kg/ha, then carry out potted plant, then be placed on local nonirrigated farmland field condition 5-8 days, measure in above-mentioned each gradient the content of available phosphorus in soil, measure CaCl simultaneously 2the content of the Soil Phosphorus that in solution, lixiviate contains variable concentrations phosphate fertilizer, draws soil available phosphorus and CaCl 2the relation curve of the relation curve of the content of the Soil Phosphorus that in solution, lixiviate contains variable concentrations phosphate fertilizer and soil available phosphorus increment and soil applying fertilizer amount;

    The initial concentration of described gradient concentration is 0kg/ha, and termination concentration is 200kg/ha;

    2) the determining of phosphorus application amount in nonirrigated farmland;

    crop is executed kind in above-mentioned soil, measure crop yield after results, draw the available phosphorus of above-mentioned soil and the relation curve of crop yield, soil available phosphorus and CaCl 2the soil available phosphorus content of the turning point of the relation curve of the content of the Soil Phosphorus that in solution, lixiviate contains variable concentrations phosphate fertilizer is the critical value that Soil Phosphorus threatens to water body;

    The soil available phosphorus content of the turning point of the relation curve of soil available phosphorus content and crop yield is the corresponding soil available phosphorus content of optimal output;

    Lower value between the corresponding soil available phosphorus content of the critical value that Soil Phosphorus threatens to water body and optimal output is the best available phosphorus content of soil;

    When not applying fertilizer, in soil, available phosphorus content is more than or equal to the best available phosphorus content of soil, without increasing the p application rate;

    When not applying fertilizer, in soil, available phosphorus content is less than the best available phosphorus content of soil, the value of difference correspondence on the relation curve of soil available phosphorus increment and soil applying fertilizer amount is the fertile amount of optimum phosphorus application.

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