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为了掌握桃优香占需肥规律和需肥水平,桃源县农业科学研究所采用农业部推荐的“3414”部分方案进行氮钾肥料效应研究。结果表明,施氮180 kg/hm~2条件下,氮肥的增产效应达到1.47 t/hm~2,增产率28.1%,每千克纯N增产稻谷8.1 kg/hm~2。在早稻稻草还田基础上,施K_2O 135 kg/hm~2,增产幅度仅为0.275 t/hm~2,增产率4.3%,钾肥的增产效应偏低;桃优香占氮钾二元二次多项式肥料效应回归模型:Y=5 228.6+12.09 N+2.97 K-0.032 2 N~2-0.020 7 K~2+0.012 4 NK,F=32.49**,显著性检验达极显著水平;根据肥料效应模型计算得出桃优香占在稻草还田5 250 kg/hm~2、基施磷肥(P2O5)30 kg/hm~2基础上的最佳经济施氮(N)量为190.7 kg/hm~2,最佳经济施钾(K_2O)量为102.8 kg/hm~2,对应的最佳经济产量为6.69 t/hm~2。
In order to grasp the law of peach youyou and the need for fertilizer, Taoyuan County Agricultural Science Research Institute recommended “3414” part of the program recommended by the Ministry of Agriculture for nitrogen and potassium fertilizer effect. The results showed that under nitrogen application rate of 180 kg / hm ~ 2, the stimulation effect of nitrogen fertilization reached 1.47 t / hm ~ 2 and the yield rate increased by 28.1%, and the yield of 8.1 kg / hm ~ 2 per kilogram of pure N was increased. On the basis of rice straw returning to the field, K_2O 135 kg / hm ~ 2 increased yield by only 0.275 t / hm ~ 2 and increased yield by 4.3% Polynomial fertilizer effect regression model: the significance test was significant at Y = 5 228.6 + 12.09 N + 2.97 K-0.032 2 N ~ 2-0.020 7 K ~ 2 + 0.012 4 NK, F = 32.49 **. According to the fertilizer effect The optimal economic nitrogen (N) content of Tao You Yu Xiang based on the model was 5 250 kg / hm ~ 2 with straw returning to field and 30 kg / hm ~ 2 with base fertilizer P2O5 190.7 kg / hm ~ 2, and the best economic K2O was 102.8 kg / hm ~ 2, corresponding to the best economic yield of 6.69 t / hm ~ 2.