留桩高度对再生稻生长发育及产量的影响

Effect of Stubble Height on Growth and Yield of Ratooning Rice

以汕优63、明恢63为试材,设10、20、40 cm3个留桩高度处理,研究了不同留桩高度对再生稻生长发育及产量的影响。结果表明,高留桩使再生稻生育期缩短,而株高、穗长、再生率和产量均增加;反之,低留桩使再生稻生育期延长,而株高、穗长、再生率和产量均下降。再生稻以“多穗取胜”,为保证再生稻获得高产,供试品种留桩高度应在30-40 cm,以确保再生季在9月中旬“寒露风”来临前安全齐穗,提高有效穗数。

Shanyou 63 and Minghui 63 were used as materials and three stubble height treatments （10 cm, 20 cm to 40 cm） were set to study the effect of different stubble height on growth and yield of ratooning rice. The results showed that higher stubble shortened the growth period, but increased plant height, spike length, ratooning rate and yield of ratooning rice. On the contrary, lower stuuble lengthened growth period, but decreased plant height, spike length, ratooning rate and yield of ratooning rice. Ratooning rice had higher yield mostly because of its spike amount. Therefore, in order to guarantee high yield of ratooning rice, the stubble of the two varieties should be in 30-40 cm, which could make sure that ratooning rice completed its full spikes before mid September before cold-dew wind arrived and enhanced the effective spike number.