Farmland phosphorus-saving synergistic fertilization method taking into account soil environmental capacity under rice-wheat rotation system
A technology for environmental capacity and farmland phosphorus saving, applied in fertilization methods, fertilization devices, agriculture, etc., can solve problems such as excessive application, and achieve the effect of protecting the water environment and saving phosphorus resources
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[0040] Example 1: Experimental Research on Phosphorus-saving and Efficient Fertilization in Huanghuai Rice-wheat Rotation Farmland
[0041] (1) Determination of soil phosphorus content in Henan Province
[0042] Based on the survey and measurement results of 400,000 soil samples in the National Soil Testing and Formula Project from 2005 to 2009, it can be concluded that the current average soil available phosphorus content in Henan Province is 2.94 times higher than the 5.90 P mg / kg in the second national soil survey. Up to 17.37P mg / kg, detailed data such as figure 1 shown.
[0043]Through the comparative study on the historical changes of soil phosphorus content in the top layer of paddy soil in Henan Province, it was found that the average content of the national soil testing formula in 2005-2009 was 12.73 P mg / kg, while in 2012, 829 samples of paddy soil from the whole province were tested. The average content of the self-test results is 15.10 P mg / kg, which is 7.03 P mg...
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