Reactions of Carbonyl Compounds with the Carbonyl Group as an Electrophile with H, C, N and O Nucleophiles.

作为亲电基的碳基与作为亲核基的H,C,N和O的羰基化合物反应。

The nutrient of C, N, P, K in rice straw buried by rotocultivator in deep soil layer released at a high rate and less remain than on surface soil.

运用机械将稻秸秆深施于水田土层内，秸秆中的碳、氮、磷、钾养分释放比秸秆面施速率高，残留量少。