长期地膜覆盖与施肥对土壤磷素和玉米吸磷量的影响

利用比较法对长期连续覆膜(17年)后土壤磷素的变化以及玉米吸收量的变化进行了研究。结果表明:经过17年的耕作,无论是施有机肥还是磷肥均能显著增加土壤中速效磷以及全磷的含量;覆膜栽培与裸地栽培比较结果,覆膜对于土壤中速效磷以及全磷含量的变化影响不大;对植株的籽粒、轴、叶片、茎的全磷进行了测定后显示:覆膜可以促进籽粒、轴、茎对磷的吸收,抑制了叶片对磷养分的吸收;从成熟期地上部分累积磷的总量来看,覆膜可以明显提高作物对磷的吸收。

Effects of Long-term Mulching and Fertilization on Phosphorus in Soil and Corn

This paper deals with the change of soil phosphorus and the uptake of P by corn in different treatments with the long-term plastic mulching and fertilization.The main results showed that soil available P and total P were evidently increased by using organic fertilizer and Chemical phosphorus fertilizer.In comparison of covered and uncovered treatments,the amount of soil available P in the covered treatments trended to be decreased,but the total P hardly changed after mulching.The treatments with plastic mulching could accelerate uptake of P by core and stalk.The results of accumulation P in maize at harvest showed that mulching could promote uptake by corn,which meant mulching could improve yield of corn.