The Effect Of NPK Fertilizer Application Amount On The Main Rice Quality

There are many factors that affect the quality of rice. Many agricultural studies show that rice quality is affected by the type of fertilizer application, the time of fertilizer application, the amount of fertilizer application, and the composition of fertilizer application. Referring to the other relevant studies, the author conducted both pot and field experiences in Lianyungang city in 2003 in an aim to explore the effects of the amount of N.P.K fertilizer on the rice quality of local rice varieties. The main results are reported as follows.1 , Effect of level of Nitrogen fertilizer application on rice quality1.1 Effects of the amount of Nitrogen fertilizer application on rice yield and its componentsEffects on the yield and dry weight of rice: the yield and the dry weight of the three rice varieties by N₅ and N10 treatments is significantly higher than that of CK, while that by N15 treatment is lower than that of CK.Effect of the yield of rice and its component: with the increase in the amount of N fertilizer application, the panicle numbers of rice significantly increase. But there are differences among the three treatments. The panicle number and the kernel number of the rice by N5 treatment are significantly higher than that of the other two treatments respectively. In contrast, that of N₁₀ and N₁₅ treatments is lower than that of CK respectively. In addition, the 1000-grain weight of the three rice varieties by N₅ and N₁₀ is significantly heavier than that of CK.1.2 effects of applying different amounts of Nitrogen fertilizer in the late rice on rice yield and its componentsThe results of increasing Nitrogen fertilizer application are shown as follows: 1) the nutritious quality of rice is enhanced as the result of the significant increase in its protein content 2) the milling quality of rice is enhanced by raising its brown rice rate, milled rice rate, and head rice rate 3) the chalky rice rates of wuyujing3 and xieyou507 are lower than that of CK, while the chalky rice rate of 3114 is higher than that of CK. 4) the rice grain amylose content and gel consistency are decreased ,thus affecting the cooking and...