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采用石灰性土壤无机磷的分级方法,研究了磷肥在栗钙土中的转化以及包被物对土壤中磷肥转化的影响和莜麦的磷肥效应。研究结果表明,在不种作物的情况下,磷肥施入土壤后很快转化为Ca_2-P、Ca_8-P、Al-P、Fe-P等形态,随施肥时间的延长,Ca_2-P呈减少趋势,其它形态的无机磷则逐渐增加;在种植莜麦的情况下,莜麦对磷肥的吸收利用率为31.1％,土壤残留为68.9％,残留磷中各形态无机磷占施入磷的比率:28.9％为Ca_2-P,11.0％为Ca8-P,10.3％为Al-P,5.5％为Fe-P,9.5％为O-P,3.7％为Ca_(10)-P;包被磷肥较未包被磷肥减少了土壤中Ca_2-P向Ca_8-P转化,增加了施入磷向Al-P的转化而减少了向Fe-P、O-P的转化,磷肥的利用率提高2.9个百分点。施用磷肥莜麦增产178％。
The classification of inorganic phosphorus in calcareous soil was used to study the transformation of phosphate fertilizer in chestnut soil and the effect of coating material on the conversion of phosphate fertilizer in soil and the effect of phosphate fertilizer on oats. The results showed that the phosphate fertilizer quickly transformed into Ca_2-P, Ca_8-P, Al-P, Fe-P and other forms after being applied to soil without any cropping. With the extension of fertilization time, Ca_2 -P decreased Trend, and other forms of inorganic phosphorus gradually increased; in the case of oat cultivation, oats the absorption of phosphate fertilizer utilization rate of 31.1%, soil residue 68.9%, residual phosphorus in various forms of inorganic phosphorus accounted for phosphorus ratio : 28.9% is Ca_2-P, 11.0% is Ca8-P, 10.3% is Al-P, 5.5% is Fe-P, 9.5% is OP and 3.7% is Ca_ (10) -P. By phosphate fertilizer to reduce soil Ca2-P to Ca_8-P conversion, increasing the conversion of phosphorus into Al-P and reduce the conversion to Fe-P, OP, phosphate fertilizer utilization increased by 2.9 percentage points. Application of phosphate fertilizer malt yield 178%.