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通过对近4年132个试验结果进行综合分析。结果表明,本市农田土壤缺钾主要受成土母质、水热状况和人为耕作影响。施用钾肥在红壤、潮土、潜育和潴育型水稻土表现较明显的效果;钾肥增产效果(y)与用量(x)之间呈y=x/(0.150+0.00678x)曲线相关;增产率(y)与肥料K_2O/N比(x)之间呈y=23.14x-14.48x~2抛物线相关,肥料K_2O/N以0.8时产量最高;钾肥最佳用量(y)和土壤速效钾(x)之间呈y=21.52-0.1125x线性负相关。水稻钾肥建议用量为5~10公斤/亩,并以一次作耙面肥为好。
Through a comprehensive analysis of 132 test results in recent 4 years. The results showed that the potassium deficiency in farmland in this Municipality was mainly affected by soil parent material, water and heat conditions and man-made farming. The application of potash fertilizer showed obvious effect on red soil, alluvial soil, latent soil and paddy paddy soil. The yield increase effect (y) of potassium fertilizer was related to the dosage (x) by y = x / (0.150 + 0.00678x) The relationship between the rate (y) and fertilizer K_2O / N ratio (x) was y = 23.14x-14.48x ~ 2 with parabola correlation. The yield of fertilizer K_2O / N was the highest at 0.8; the optimum amount of potassium fertilizer (y) x) y = 21.52-0.1125x linearly negatively correlated. The recommended amount of potash fertilizer for 5 ~ 10 kg / acre, and to make a rake as well.