Effects Of Nitrogen And Seeding Date On The Yield And Quality Of Low Glutelin Rice

To study the response of population quality, grain yield, rice quality, nitrogen use efficiency of low glutelin rice to nitrogen and seeding date and the realationship between SPAD value and easy-to-digest protein, from 2009 to 2010, two field experiments were conducted in Danyang city of Jiangsu province, the way that improving grain yield and rice quality of low glutelin rice at the same time was clarified, and theoretical basis and technical reference were provided for high yield and quality of low glutelin rice. Results showed as following:1. Eeffects of nitrogen application on the yield and quality of low glutelin riceWith the increasing of nitrogen amount, the popularion LAI, tiller number and dry matter accumulation of low glutelin rice significantly improved. when the nitrogen amount was below 270 kg/hm2, with the enhancement of nitrogen amount, the grain yield increased, when the nitrogen amount reached 360 kg/hm2, the grain yield decreased significantly. With mid nitrogen amount applying, the N uptake efficiency of W3660 was higher, and lower in the other way round. The processing quality and nitrogen nutritional quality were improved by using nitrogen, however, when the nitrogen amount reached 360 kg/hm2, the chalky condition aggravated and the cooking quality decreased. Under the same nitrogen amount, when panicle ratio increased, the LAI at heading stage, dry matter accumulation after flowering, transporting rate after flowering, nitrogen use efficiency and one hundred kilogram grain nitrogen uptake were improved, the processing quality and nutritional quality of rice were better, and chalkiness degree was fewer. Above all, the yield and quality of W3660 were best when application of nitrogen amount was 180 kg/hm2 and nitrogen ratio was 6:4.2. Effects of seeding date on the yield and quality of low glutelin rice genotypesWhen the seeding date delayed, the vegetative stage of low glutelin rice reduced and the grain filling stage and the growth pield increased, the processing quality increased at first and then decreased, chalkiness degree, protein content changed oppositely, amylose content of different varieties change differently, amylose content of W3660 and W1721 decreased firstly and then increased, amylose content of W1240 increased. Comparison between different varieties, the dry matter accumulation from heading stage to maturity stage, the LAI at heading stage and grain yield showed W1240>W1721>W3660, the indicators of W1240, W1721 and W3660 in the above-mentioned reached maximum by seeding at May 30, May 20 and May 10, respectively. Head milled rate, chalkiness degree, amylose content and protein content showed that W3660>W1721>W1240. Correlation analysised of climatic factors with protein show that the climatic factors at filling stage were significantly correlation with protein traits, and the partial correlation coefficients of average temperature, daily temperature and daily radiation characteristics with the protein were larger than others, while the partial correlation coefficients of the average daily rainfall, daily mean reative humidity with protein were lower.3. Effects of nitrogen and seeding date on protein components and SPAD diagnosis of low glutelin riceUnder field conditions, the prolamin, glutelin, easy-to-digest protein and total protein content of rice was increased signicantly with the increasing of nitrogen amount and panicle ratio. When the seeding date delayed, the easy-to-digest protein and total protein content significantly reduced. At heading stage, the SPAD value of the third leaf from the top and easy-to-digest protein in milled rice was significantly correlated, the exponentical function y=1.4351e0.0207x, R2=0.857 forecasts better.