节水灌溉下节水抗旱稻品种沪优2号产量优势及其生理基础
Yield Advantage of Water-saving and Drought-resistance Rice Cultivar Huyou 2 under Water-saving Irrigation and Its Physiological Basis
为探明节水抗旱稻品种在节水灌溉条件下的产量优势与生理基础，以新培育的节水抗旱稻品种沪优2号为材料，以高产杂交稻内5优8015为对照，设置2种灌溉模式（常规灌溉与节水灌溉），研究了2种灌溉模式下沪优2号和内5优8015的种植表现。结果表明，在常规灌溉下，供试品种产量无显著性差异，产量均高于9 t/hm2；与常规灌溉相比，节水灌溉显著降低了对照品种的产量，降幅达到27.4%，而对节水抗旱稻品种产量影响较小。节水抗旱稻品种在节水灌溉下保持较高的产量，主要得益于其具有较强的分蘖能力，较高的分蘖成穗率、每穗粒数和结实率，齐穗期有较大的根系生物量以及较深的根系分布，且复水后有较高的根系氧化力。
施鸿鑫1,孙雄彪2 . 节水灌溉下节水抗旱稻品种沪优2号产量优势及其生理基础[J]. 中国稻米, 2019 , 25(2) : 64 -68 . DOI: 10.3969/j.issn.1006-8082.2019.02.014
In order to explore the yield advantage and physiological basis of water-saving and drought-resistance rice varieties under water-saving irrigation, the planting performance of one newly bred water-saving and drought-resistance cultivar Huyou 2 and high-yielding cultivar Nei 5 you 8015 under conventional irrigation and water-saving irrigation modes was compared. The results showed that there was no significant difference in yield of two test varieties under conventional irrigation, the yields are higher than 9 t/hm2. Compared with conventional irrigation, under water-saving irrigation the yield of Nei 5 you 8015 significantly reduced by 27.4%, but the yield of Huyou 2 reduced little. Higher grain yield and higher water use efficiency of water-saving and drought-resistance rice cultivar under water-saving irrigation should be attributed to the following aspects: greater tillering ability and higher percentage of productive tillers, more spikelets per panicle and higher seed setting rate, larger root biomass and deeper root distribution at heading stage, higher root activity at re-watering period.
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