滨海盐碱地不同氮肥用量对水稻干物质转运及稻米品质的影响

为探讨滨海盐碱地不同氮肥用量对水稻干物质积累和转运、稻谷产量及品质的影响,以常规中粳中晚熟品种圣稻2620为试验材料,在含盐量3‰～6‰条件下研究了6种氮肥施用方式(N5,40 kg/667 m2;N4,32 kg/667 m2;N3,24 kg/667 m2;N2,16 kg/667 m2;N1,8 kg/667 m...

Effects of Different Nitrogen Application Rates on Dry Matter Transport Characteristics and Quality of Rice in Coastal Saline Alkali Land

In order to study the effects of different nitrogen application rates on dry matter accumulation, translocation, yield and quality of rice in coastal saline alkali land, a field experiment was carried out under the condition of 3‰~6‰ salt content, using Shengdao 2620 as material. The results showed that, with the increase of nitrogen application rate, the proportion of reproductive growth period in the whole growth period of rice increased from 23.67% （N0, no nitrogen fertilizer） to 25.00% （N5, nitrogen application rate is 40 kg/667 m²）, the proportion of vegetative growth period in the whole growth period of rice decreased from 76.33%（N0） to 75.00% （N5）, the whole growth period of rice decreased from 180 days （N5） to 169 days（N0）. The peak period of dry matter accumulation was from 25 days after the green returning period to 20 days after heading. The overall dry matter accumulation rate was N5 > N4（nitrogen application is 32 kg/667 m²）> N3（nitrogen application is 24 kg/667 m²）> N2（nitrogen application is 16 kg/667 m²）> N1（nitrogen application is 8 kg/667 m²）> N0. The dry matter output rate and conversion rate of stem sheath and leaf were increased with the increase of nitrogen application rate, but reduce nitrogen application rate by 20% did not affect dry matter output and transformation. With the increase of nitrogen application rate, the chalky rice rate was significantly decreased, head rice rate and appearance quality were significantly increased. With the increase of nitrogen application rate, the eating quality of rice decreased significantly, the eating value decreased from 72 （N0） to 67 （N5）. However, the yield was increased significantly, from 388.34 kg/667 m² （N0） to 525.89 kg/667 m²（N4）. The yield of N4 treatment （nitrogen fertilizer） reduced by 20% was 4.39% higher than that of total nitrogen fertilizer N5 treatment.