直播水稻高产稳产的简易诊断指标及其调控技术

ANALYSIS OF SIMPLE AND EASY DIAGNOSTIC TARGETS AND RELATED CONTROL TECHNIQUE FOR STABLE HIGH-YIELD OF DIRECT-SEEDING RICE

应用微机统计分析了1987—1988年直播水稻群体系统试验资料,从中明确了每亩穗数、干物重、叶面积系数、株高和上展叶长与产量构成因子中的穗数、每穗实粒数的关系,并看到六叶期与九叶期是预测穗数、实粒数的适宜时期。从而指出直播稻亩产500公斤的各生育期的诊断指标及其调控技术,以供直播稻生产应用和参考。

A series of data were analysed by microcomputer through direct-seeding rice experiments with 16 treatments during 1987—1988.The result indicated that 5 sim- ple and easy diagnostic items namely rice seedling number per unit area,dry matter we- ight per unit area,leaf area index,plant height and lenghtof fully developed upper le- af had respectively significant effects on the yield of rice. Also relationships between observed values of the 5 above items and ear number per unit area as well as grain number per ear were further regressively analysed,resp- ectively,the result showed that 6-leaf stage (tillering stage) and 9-leaf stage (full ti- llering stage) were the suitable stages for the prediction of ear number per unit area and grain number per ear in rice yield structure by observations of the 5 above diagnosis items.Therefore,the diagnostic targets of the 5 above items at different stages,corres- ponding to the yield of T.5t rice per ha were calculated,also the prediction method for diagnostic targets stage to stage was established.These results can be used in simple and easy diagnosis for stable high yield of direct-seeding rice.