地表覆盖物处理对作物及土壤中氮、磷含量的影响.docVIP

地表覆盖物处理对土壤氮、磷的影响 on N and P Contents in Soils and Crops 地表覆盖物处理对土壤氮、磷的影响摘要结果表明：在秸秆覆盖前期，在秸秆覆盖、地膜覆盖、无覆盖情况下，青花土壤中全含量分别为1.68g/kg、1.73g/kg、1.61g/kg玉米土壤中全含量分别为1.69g/kg、1.75g/kg、1.60g/kg；在秸秆覆盖后期，青花土壤中全含量分别为1.72g/kg、1.42g/kg、1.41g/kg玉米土壤中全含量分别为1.70g/kg、1.37g/kg、1.34g/kg在秸秆覆盖前期，在秸秆覆盖、地膜覆盖、无覆盖情况下，青花土壤中全含量分别为1.36g/kg、1.11g/kg、1.26g/kg玉米土壤中全含量分别为1.45g/kg、1.22g/kg、1.34g/kg；在秸秆覆盖后期，青花土壤中全含量分别为1.49g/kg、1.40g/kg、1.72g/kg玉米土壤中全含量分别为1.55g/kg、1.51g/kg、1.68g/kg；关键词：Effects of much on N and P contents in soils and crops ABSTRACT Field experiments were conducted to research effects of mulch on N and P contents in soils and crops with different covering to improve N, P utilization rate and reduce the production cost. The results showed that: (1) With straw covering, N contents of stem and leaves, roots and fruits in cauliflower were 7.61%, 5.74% and 12.37%, P contents 0.66%, 0.71% and 1.61%, respectively. N contents of stem and leaves, roots and fruits in maize were 3.50%, 2.93, 3.08% and 0.93%, P contents 1.14%, 2.04 % and 0.41%, respectively. (2) With plastic film covering, N contents of stem and leaves, roots and fruits in cauliflower were 8.07%, 3.31% and 11.90%, P contents 1.12%, 0.50% and 1.52%, respectively. N contents of stem and leaves, roots and fruits in maize were 0.84%, 3.22%, 1.12%and 0.75%, P contents 1.72%, 2.09%, 2.00% and 0.38%, respectively. (3) With no covering, N contents of stem and leaves, roots and fruits in cauliflower were 7.84%, 3.87% and 11.99%, P contents 1.06%, 0.62% and 1.35%, respectively. N contents of stem and leaves, roots and fruits in maize were 1.12%, 3.13%, 2.98% and 2.43%, P contents 1.26%, 2.12%, 2.76% and 0.26%, respectively. (4) With straw, plastic film and no covering, N contents in soils planting cauliflower were 1.68 g/kg, 1.73 g/kg and 1.61 g/kg, and in soils planting maize 1.69 g/kg, 1.75 g/kg, 1.60 g/kg in the first stage, respectively. With straw, plastic film and no covering, N contents in soils planting cauliflower were 1.72 g/kg, 1.42 g