水稻分蘖发生及与特定部位叶片叶鞘含氮率的关系

以水培的方法，设计不同的供氮水平，研究了水稻分蘖的发生、生长，出叶和干物质生产的变化规律。结果表明：分蘖发生及新叶的出生与供氮水平及叶片、叶鞘的含氮率关系密切，过高过低的供氮水平均不利，即分蘖发生及新叶的出生要求一个最适的供氮水平，在本试验中是７０～５０ｍｇ／Ｌ；过低的氮素供应水平，会使叶蘖同伸的ｎ—３关系打破，出现叶蘖ｎ—４同伸的滞后现象；分蘖的发生与发生分蘖的节位和上一节位的叶片、叶鞘的含氮率呈极显著正相关，此两叶的含氮率高则分蘖发生多，因此，这两叶含氮率的高低可作为分蘖发生与否的诊断指标。

RELATIONSHIP BETWEEN EMERGENCE OF TILLER AND NITROGEN CONCENTRATION OF LEAF BLADE OR LEAF SHEATH ON SPECIFIC NODE OF RICE

This paper studied the emergence and growth of tillers, leaf emergence and dry matter production of rice with solution culture systems of different nitrogen concentrations. The results are as fellows: the emergence of the tiller and leaf was affected significantly by the nitrogen concentrations of the solution, the leaf blade and the sheath. The optimum nitrogen concentration in the solution for the emergence of the tiller and leaf was 70-50 mg/L in this experiment; the law of leaf-tiller n-3 synchronization could be changed to the law of leaf-tiller n-4 synchronization by the lower nitrogen concentration of the solution; the tiller emergence rate was significantly correlated to the nitrogen concentrations of the 3rd and the 4th leaf blades (from top) and the 3rd leaf sheath, and to the nitorgen concentration of the 4th sheath. Thus the nitrogen concentrations in the two successive leaves on the tillering-node and the above node could be considered as an indicator of tiller emergence.