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1980—1986年在湖北省油菜主产区,应用正交没计和回归旋转设计进行多点试验共82次,示范点72个,研究油菜氮磷钾经济施肥技术。结果指出实行油菜氮磷钾经济施肥非常必要,油菜的土壤养分丰缺指标可以划分为四级。以三元平方根多项式为数学模型,符合肥料效应递减律的试验结果,用PC—1500型电子计算机计算经济施肥量。亩产油菜籽100—125公斤范围内,亩施N、P_2O_5和K_2O(公斤)低肥田为14.75,8.60和6.15,较低肥田为13.20,8.00和8.25,中肥田为10.25,6.45和5.10,高肥田为7.62,5.05和3.70。每亩投资和利润(元)分别为低肥田32.60和33.70,较低肥田为29.98和30.41,中肥田为23.78和34.54,高肥田为18.07和37.82。
1980-1986 in Hubei main rapeseed production areas, the application of orthogonal and regression design rotary test carried out a total of 82 multiple points, 72 demonstration sites, the rape nitrogen, phosphorus and potassium economic fertilization techniques. The results indicated that it is very necessary to carry out nitrogen, phosphorus and potassium fertilization in rapeseed. The index of soil nutrient abundance and rapeseed can be divided into four grades. Taking the square root of a square root polynomial as the mathematical model, the experiment results that accord with the decrement law of fertilizer effect were calculated by PC-1500 computer. In the range of 100-125 kg per mu of rapeseed, the low fertilization fields of N, P2O5 and K2O (kg) were 14.75, 8.60 and 6.15, the lower fertilization fields were 13.20, 8.00 and 8.25, the middle fertilization fields were 10.25, 6.45 and 5.10, respectively Fertilizers are 7.62, 5.05 and 3.70. The investment and profit (yuan) per mu were 32.60 and 33.70 for low fertilizers, 29.98 and 30.41 for lower fertilizers, 23.78 and 34.54 for medium fertilizers and 18.07 and 37.82 for high fertilizers.