Effect of irrigation mode coupling nitrogen fertilizer application model on yield formation of Japonica Rice in cold region
ZHAO Hongwei;SUN Bin;WANG Zhuoqian;SHA Hanjing;ZHANG Bo;GU Haitao;Rice Research Institute, Northeast Agricultural University;
In order to explore the effect of irrigation mode coupling nitrogen fertilizer application model on the dry matter accumulation and yield formation of Japonica rice in cold region, two Japonica Rice(Dongnong 425 and Songjing 6) were selected as test materials. The experiment set 3 irrigation methods(W1, normal irrigation; W2, mild wetting-drying alternate irrigation; W3, severe wetting-drying alternate irrigation) and 3 nitrogen application model(the ratio of basal fertilizer, tillering fertilizer, panicle fertilizer and grain fertilizer were 6:3:1:0(N1), 5:3:1:1(N2), 4:3:2:1(N3)) at the same nitrogen level. The effects of irrigation method coupling nitrogen fertilizer application model on dry matter accumulation and translocation,pollen fertility, grain filling, yield and yield components of Japonica rice in cold region were studied, providing guidance for high yield and high efficiency cultivation of Japonica rice in cold region. The results showed that there was significant interaction on these above mentioned indexes between irrigation method and nitrogen fertilizer. Compared with W1, W2 and W3 improved the dry matter transport rate, contribution rate, and grain filling rate, shortened filling time, advanced filling period, decreased the effective panicle number, grain number and pollen fertility of two varieties. In addtion, W2 increased 1000-grain weight of two varieties, the seed setting rate, harvest index, not significantly changed the dry matter accumulation and output of Dongnong 425, but decreased the dry matter accumulation, output, seed setting rate and harvest index of Songjing 6. However, 1000-grain weight, dry matter accumulation and output, seed setting rate and harvest index of two varieties decreased under W3 treatment. The ratio of root to shoot in two Japonica rice varieties increased with the increasement of water stress. Compared with N1 under the same irrigation condition,Dongnong 425 and Songjing 6 with N2 application model effectively improved the dry matter accumulation and transport capacity, panicle number, grain number, seed setting rate, 1000-grain weight, harvest index and pollen fertility; N3 model increased the effective panicle number, grain number, 1000-grain weight and yield, but decreased seed setting rate, harvest index, matter transfer rate and contribution rate of stem and sheath. The results showed that W2N2 was the best coupling mode for Dongnong 425 and W1N2 for Songjing 6.
【Fund】： 国家重点研发计划项目(2016YFD0300104);; 黑龙江省重大科技招标项目(GA14B102-02)
【CateGory Index】： S511.22
【CateGory Index】： S511.22