Effect of root damage on rice growth and yield response
2002
Cai, K.Z. | Lou, S.M. | Duan, S.S.
Field experiments with different varieties under different root cutting (root was cut from one, two, or three sides of the rice plant and no cutting) at the heading stage were conducted on their effect on yield and yield components. The results showed that root cutting increased root activity significantly at the ripening stage in general, irrespective of varieties and treatments. One side cutting caused a yield increase in four varieties (Guang-Lu-Ai 10.2%, Pei-Za-72 4.6%, Feng-Ai-Zhan 1 12.8%, Te-San-Ai 11.4%) and a decrease in one (Er-Qing-Ai by 18.2%). The difference was mainly associated with a difference in grains per panicle and percentage filled grains. Two side cuttings (T2) and three side cuttings (T3) caused a yield increase in two varieties (Guang-Lu-Ai and Te-San-Ai) and a decrease in three (Er-Qing-Ai, Pei-Za-72, Feng-Ai-Zhan 1). It can be concluded that light root cutting at the heading stage has no significant effects on rice yield. It can even increase the yield of some varieties. This may be because root cutting can increase root activity at maturity, which is important for improving the ability to absorb water and nutrient and delay the plant from senescence.
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