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Response Time of Mid-hybrid Rice to Flood Stress and High Yielding Regulation Techniques for Ratoon Rice
2015, 21(5):
29-32.
DOI: 10.3969/j.issn.1006-8082.2015.05.006
Three experiments with three mid-hybrid rice cultivars （Chuanguyou 642, Rongyou 1015 and Chuanguyou 7329） were conducted in 2014 in Luxian county to determine the effects of submergence time, stubble height, budding-promoting fertilizer and plant growth regulators on yield and yield components of mid-hybrid rice and ratoon rice. The results showed that: 1） Submergence 48 h at flowering stage, grain filling and grain weight of mid-hybrid rice were decreased by 23.6% and 6.5%, respectively, compared to control treatment （no flood stress, CK）, however, the difference was relatively small between 2 h, 4 h after flowering submergence 48 h and CK. 2） The grain yield of ratoon rice significantly increase with budding-promoting fertilizer application. Compare to 35 kg/hm2 and 70 kg/hm2, the grain yield under 105 kg/hm2 increased by 33.5% and 8.3%, respectively, owing to the higher panicles per m2, spikelets per panicle and grain filling. The grain yield of ratoon rice was no significantly affected by stubble height and interaction effects of stubble height by budding-promoting fertilizer. 3） Penchangqing and Meizhouxing improved the panicles per m2, spikelets per panicle and grain filling and increased grain yield of ratoon rice by 15.2% and 17.4%, respectively, compared with water （CK）. The maximum tiller and grain filling of Paclobutrazol was higher but the spikelets per panicle were lower than those of water （CK）, and there was no significant effect on grain yield of ratoon rice.
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