| A field plot experiment with "3414" design was carried out to examine N, P and K fertilization response to late rice on reddish clayey soil which was developed from quaternary red clay in Ningxiang County, Hunan Province, and to provide a scientific basis for reasonable fertilization of the local rice production to reduce wasting fertilizers and environmental pollution caused by unreasonable fertilization. The fertilization efficiency model of early rice production in the tested soil of Ningxiang County was established by use of computer technique based on the experiment result. The main results were as follows:1. Compared the treatment of straight fertilizer with that of not straight fertilizer, the biomass production has increased with applying straight fertilizer under fixing other two elements of N, P and K. In a certain-applying rate range, the production has been increased as increasing the straight fertilizer, but the increase rate has been decreased. Compared the fertilizer with no fertilizer, rice yield has a little improved, at the same time, in addition to dealing with 2 and no fertilization little difference, other fertilization and no fertilization yield significant differences compared with, indicating fertilization have a significant increase fertilizer effect. Among them, it increased yield more significant, because of the application of nitrogen fertilizer.2.According to the results of "3414" field experiment, the fertilization efficiency model of early rice production in Ningxiang County has been gotten, and the application rates of N, P and K fertilizers were obtained as rice yield was maximum by use of computer technique. The N fertilization efficiency models of 3 experiment sites, QuiKuaiYi, QiuKuaiEr and QiuKuaiSan, were y=275.67+18.94N-0.59N2, y=262.61+ 18.74N-0.57N2 and y=270.48+16.44N-0.58N2, respectively. The P fertilization efficiency models of 3 sites, Quikuaiyi, QiuKuaiEr and QiuKuaiSan, were y=382.06+7.44P-0.61P2, y=368.80+7.40P-0.56P and y=357.47+4.07P-0.18P2, respectively. The K fertilization efficiency models of 3 sites, Quikuaiyi, QiuKuaiEr and QiuKuaiSan, were y=386.68+ 7.91K-0.57K2, y=360.00+12.03K-0.98K2 and y=357.10+5.75K-0.40K2, respectively.3. According to the result of "3414" field experiment, the fertilization efficiency model of early rice production in Ningxiang County has been gotten, and the binary quadratic of N, P and K fertilizers were obtained as rice yield was maximum by use of computer technique. The N,P binary quadratic fertilization efficiency models of 3 experiment sites, QuiKuaiYi, QiuKuaiEr and QiuKuaiSan, were y=250.89+17.51N+ 8.84P-0.51N2-0.75P2+0.004NP, y=268.13+14:62N+3.13P-0.50N2-0.64P2+0.46NP, and y=278.43+13.02N+0.90P-0.54N2-0.35P2+0.45NP, respectively. The N,K binary quadratic fertilization efficiency models of 3 experiment sites, QuiKuaiYi, QiuKuaiEr and QiuKuaiSan, were y=271.74+16.29N+2.58K-0.52N2-0.29K2+0.22NK, y=275.95+ 13.48N+3.49K-0.53N2-0.93K2+0.73NK, and y=288.95+12.29N+0.43K-0.56N2-0.58K2+ 0.65NK, respectively. The P,K binary quadratic fertilization efficiency models of 3 experiment sites, QuiKuaiYi, QiuKuaiEr and QiuKuaiSan, were y=252.15+28.41P+ 24.37K-0.99P2-0.51K2-2.84PK, y=280.05+18.90P+21.37K-0.96P2-1.16K2-1.25PK, and y=293.7O+12.72P+13.59K-0.38P2-0.52K2-1.10PK, respectively. The binary quadratic model of optimal fertilizer fertilizer effect is not reasonable, and the ratio of output below the best treatment of six overlapping production, so the model is not good.4. According to the result of "3414" field experiment, the composite fertilization efficiency models of 3 sites were also established. The composite fertilization efficiency models of 3 sites were y=264.670+8.89N+10.65P+4.08K-0.45N2-0.52P2-0.05K2+ 0.52NP+0.75NK-1.55PK (Quikuaiyi site), y=255.69+10.11N+8.51P+7.15K-0.52N2-0.71P2-0.91K2+0.47NP+0.82NK-0.78PK (QiuKuaiEr site), and y=249.59+9.93N+9.41P+ 7.43K-0.55N2-0.41P2-0.55K2+0.38NP+0.63NK-1.20PK (QiuKuaiSan site), respectively. |
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