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Effects of Phosphorus Activator on Validity of Phosphorus in Red Soil

Author: LiJie
Tutor: ChenZhiWen
School: Jilin Normal University
Course: Physical Geography
Keywords: temperature phosphorus activator available phosphorus inorganic phosphorus
CLC: S158
Type: Master's thesis
Year: 2011
Downloads: 21
Quote: 0
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Abstract


The low utilization rate of phosphate fertilizer will not only result in direct economic losses,but also on the adverse consequences for people’s survival environment. Therefore, the global topic subject is how to improve the seasonal utilization of phosphate fertilizer and reduce environmental pollution. The phosphorus activator is an effective way which improves the low utilization rate of Chinese phosphate fertilizer and the serious fixation of phosphate status. Effects of temperature and various activators on plant nutrition and the validity of P were important. However people ignored the research about the effects of PA in different temperature. The paper selected the humic acid、ethyl allophanate、sodium humate、low-molecular weight organic acid、low-molecular weight humic acid,Citric acid as PA,used red soil in Fujian province as tested soil. With soil incubation test,the paper studied the effects of phosphorus activator on different type of phosphorus and their validities in red soil.①S oil incubation test showed: When not phosphate fertilized, the amount of available phosphorus: 15℃>25℃>35℃,while the case was opposite when phosphate fertilized. PA was good at increasing the amount of available phosphorus in red soil. The effects were difference in different temperature. Compared with the treatment B(phosphate fertilized), when 15℃,four kinds of PA,with the order being humic acid > sodium humate >low-molecular weight organic acid>ethyl allophanate, enhanced the amount of available phosphorus about 22.23%、18.25%、14.35%、6.74% separately; when 25℃,about 33.91%、18.92%、18.65%、16.66% separately, with the order being ethyl allophanate>humic acid>low-molecular weight organic acid>sodium humate; when 35℃, ethyl allophanate is not obvious to synergize compared to CK(B). The other PA could enhance the amount of available phosphorus about 13.09%、10.56%、4.02% separately, with the order being humic acid>sodium humate>low-molecular weight organic acid.②The results showed that PA can improve available phosphorus contents in the soil effectively, and activations capability of different activators differed. Results of coeffcient analysis and path coefficient analysis showed that the activations capability order were as follows: low-molecular weight organic acid > humic acid >sodium humate> ethyl allophanate. Meanwhile,PA can improve Al-P, Ca-P, Fe-P and other inorganic phosphorus contents effectively,and Al-P and Ca-P was different from control significantly at 1% level,while available phosphorus and Fe-P were not different with control obviously. They still could affect active phosphorus according to Al-P and Ca-P indirectly.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil fertility (soil fertility )
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