不同种植方式对水稻植株发根力的影响

采用剪根水培和3H核素示踪的方法研究了种植方式对水稻植株不同生育阶段发根力的影响。结果表明:发根力指标在整个生育期内呈单峰曲线,单株根长、根数和根重均在孕穗期达到峰值;3种种植方式中,常耕插秧处理的植株在拔节至抽穗期发根力最强,而免耕留茬抛秧处理的发根力最低。抽穗后10d,免耕留茬抛秧处理的新根重、新根3H-同化物比活度、总活度和分配比例均最高。新根干重与新根的3H-同化物分配比例呈极显著正相关,与穗的3H-同化物分配比例呈极显著负相关。

EFFECTS OF DIFFERENT TILLAGE AND TRANSPLANTING METHODS ON RICE ROOTING ABILITY

Effects of different tillage and transplanting methods on rice rooting ability were studied with the methods of water culture and~3H labeling.The results showed that the dynamic curve of rooting ability had single peak during growth period,and the peak of root length per plant,root number and root dry weight appeared at booting.With conventional tillage and transplanting method,the rice plant had the strongest rooting ability,under non-tillage treatment(BCSNT),the rooting ability was the lowest during elongating to heading.After 10d of heading,the dry weight and~3H specific activity of BCSNT was higher than other treatments,at the same time,the percentage of~3H assimilate at new root was the highest.Dry weight was positively correlated with percentage of~3H assimilate of new root,while negatively with percentage of~3H assimilate of panicle.