水稻产量形成与叶片含氮量及叶色的关系

Relationship between yield formation and leaf nitrogen content and color in rice plant

以 6个中晚熟水稻品种为材料 ,研究了不同时期叶片含氮量与分蘖发生、穗粒形成及产量的关系。结果表明 ,分蘖发生率随出生时叶片含氮量提高而提高 ,分蘖发生与终止的临界叶片含氮量随分蘖出生期推迟而逐步提高 ;穗颖花数主要受倒 2叶期、倒 1叶期叶片氮状况影响 ,结实率与抽穗期叶片氮状况有关 ,穗颖花数和结实率最高时叶片含氮量粳稻为 2 7～ 2 8g·kg-1,籼稻为 2 5g·kg-1左右。试验发现 ,N -n叶龄期、倒 2叶期和抽穗期主茎顶 4叶叶色接近或略深于顶 3叶为不同品种高产的共同特征 。

Relationships between nitrogen contents in leaf at different stages and tiller emergency,spike,grain and yield formation were studied with six middle and late maturity rice varieties.The results indicated that tillering percentage increased with enhancing nitrogen content in leaf,suitable nitrogen contents in leaf for tillering emergency and termination enhanced with the delay of tillering stage.Spikelet number per spike was mainly affected by the nitrogen contents in the first and second leaf from the top,productive grain percentage was related to nitrogen content at heading stage,and suitable nitrogen contents in leaf for spikelet differentiation and productive grain formation were 27?28 g·kg -1 and 25 g·kg -1 in Japonica and Indica rices respectively.Color of four top leaves in main stem at N-n,N- 1 and heading stage was similar with or slightly darker than that of three top leaves,which was a common characteristic for high yield in different rice varieties.In addition,suitable leaf nitrogen content indices for high yield in rice plant were provided.