In order to understand the effects of water or N fertilizer on rice yield,quality and its physiological mechanism,a japonica hybrid rice cultivar Yongyou 2640 was grown in field,and two irrigation regimes,namely conti...
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In order to understand the effects of water or N fertilizer on rice yield,quality and its physiological mechanism,a japonica hybrid rice cultivar Yongyou 2640 was grown in field,and two irrigation regimes,namely continuously flooded(CF) and alternate wetting and moderate drying irrigation(AWMD),and three N rates,namely LN(120 kg N/ha),MN(240 kg N/ha),HN(360 kg N/ha) were *** effect of irrigation regimes and N rates on rice growth and development,yield formation,nutrient uptake,and rice quality were *** results showed that,at the same N rate and compared with CF,AWMD significantly increased grain yield by 6.7%-18.6%because of increases in the percentage of filled grains and 1000-grain *** the CF regime,the grain yield at HN and MN were 21.1%-23%and 12%-15.5%higher than LN,*** yield at HN was lower than MN due to the lower percentage of filled grains and lower 1000-grain *** the AWMD regime,grain yield showed no significance between MN and HN although both MN and HN exhibited a higher grain yield than that LN,with the increase by 23.7%-25.3%arid 23.2%-24.4%,*** all the treatment combinations of irrigation regimes and N rates,the combination of AWMD+MN showed the highest grain *** reason for the high yield of AWMD+MN was the synergetic increase in total number of spikelets,the percentage of filled grains and 1000-grain *** compared with CF,AWMD significantly reduced irrigation water by 18.1%-23.2%and increased water use efficiency(WUE) by 27.3%-55.3%.The WUE was highest when AWMD combined with *** the same N rate,when compared with CF,AWMD significantly increased appearance quality through reducing rice chalk size,chalkiness degree,and improved starch viscosity property by reducing setback and increasing peak viscosity and *** AWMD+MN treatment combination showed the highest milled rice rate,head rice rate and the lowest amylose content,and the best rice quality among all the treat
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