再生稻头季机收留桩高度试验初报

Primary trial report on machinery-harvested stubble height of ratoon rice at the first cropping season

选择适宜的留桩高度是机收再生稻的关键技术之一,以内优航148水稻为试验材料,设计留桩高度5 cm、15 cm、25 cm、35 cm 4个处理,进行机收再生稻留桩高度试验,结果表明:留桩高度为25 cm时,最高苗数、有效穗数多,穗粒结构合理,每667 m2产量达372.4 kg,比留桩高度5 cm、15 cm、35 cm分别增加71.7 kg、53.6 kg、26.8 kg;留桩高度25 cm及以下处理,碾压区与无碾压区的再生季可以调节至同一时间收获。

Selecting suitable stubble height is one of the key techniques for machinery-harvested ratoon rice. By using rice cultivar ＂Neiyouhang148＂ as test material, and designing four treatments of stubble heights, i.e. 5 cm, 15 cm, 25 cm and 35 cm, the test on machinery - harvested stubble height of ratoon rice at the first cropping season were carried out. The results showed that, when stubble height was 25cm, the treatment had the maximum tillers number, more effective panicle number and rational panicle-spikelet structure, the yield reached to 372.4 kg/667 m2, and the yield increased by 71.7 kg/667 m2（ 1075.5 kg/hm2 ）, 53.6 kg/667 m2 （ 804. 0 kg/hm2 ） and 26.8 kg/667 m2 （402.0 kg/hm2 ） to compare with the treatments of 5 era, 15 cm and 35 em respectively; the treatments with stubble height 25 cm and lower, the harvesting time could be adjusted to the same time in rolling area and no-rolling area.