氮素水平对不同穗型品种产量性状的影响

以不同穗型水稻品种为试材,研究不同氮素水平下水稻产量性状的结果表明:直立穗品种的 生物产量高于弯曲型品种,经济系数低于弯曲型品种。在低氮条件下,两品种的经济系数均提高,且 弯穗型品种的经济产量略高于直穗型品种,在高氮条件下则相反。在相同肥力下,抽穗前两品种的物 质生产差异不大,但抽穗后直穗型品种的物质生产明显高于弯穗型品种。同时发现在低氮条件下,两 品种的穗数明显减少,但穗粒数增多,结实率提高,一、二次枝梗的千粒重均高于高氮处理。

The Effects of Different Levels of Nitrogen Condition on Production Characteristics In the Different Panicle Rice

Using different panicle rice varieties as the materials, studying their production characteristics in different levels of nitrogen condition, the results were as following: the biomass of the erect panicle variety was higher than that of the curved panicle variety. The harvest index of the erect panicle variety was lower than that of the curved panicle variety. In the low nitrogen fertilizer condition, the harvest index of these two varieties were all improved, further the grain yield of curved panicle variety was higher than that of the erect panicle variety, the result is reverse in high nitrogen fertilizer condition. In the same fertilizer condition, the amount of dry matter production after heading of erect panicle variety was clearly higher than that of the curved panicle variety. In the low nitrogen fertilizer condition, the number of both variety'' spike were decreased, and the grain numbers improved, the seed setting percentage increased. Meanwhile 1000-grain weight of the primary and secondary branches was heavier than those in the high nitrogen fertilizer condition.