关键词: 冬水田;杂交中稻;肥料稻谷生产效率;干物质

Abstract:

The experiment was conducted with 18 mid-season rice combinations grown under the conditions of nitrogen application (AN) and no nitrogen application (NN). The results indicated that the grain productive rate showed P (292.47~328.04 g grain/g P)＞K(95.39~107.12 g grain/g K)＞N(57.35~70.35 g grain/g N), highly significant positive correlations were observed between the grain productive rates of N、P、K and harvest index of grain. N、P、K and dry matter DM accumulation above ground plants were increased by AN, and the increasing amount of P was bigger than that of K, but their increasing amount were mainly distributed in stems and leaves. The accumulation of N、P、K above ground plants were increased by AN, which was the common function of DM and N、P、K content increased, the effect of increasing N、P、K content (66.30%~80.16%) was bigger than that(19.84%~33.70%) of DM. Significant or highly significant negative correlations were observed between N、P、K content above ground plants and their grain productive rate, the ratio of N、P、K uptake amount above ground plants of 18 mid-season rice combinations was 1∶0.20~0.21∶0.61~0.66, 73%~80% N、P  were distributed in grain, 73%~75% K  were distributed in stems and leaves.

Key words: winter paddy field, mid-season hybrid rice, nutrient grain productive rate, dry matter