论文部分内容阅读
依１９８６～１９９３年试验结果建立的二次多项式回归方程，探讨了甜菜氮磷钾肥需要量及其效应与土壤肥力的关系。结果为：获得最高块根产量和最高纯经济效益的施氮量分别为９．４１ｋｇ／亩和７；６８ｋｇ／亩。在最高纯经济效益施氮量下，平均每公斤氮增加块根５１．９ｋｇ，降低含糖率（０．１０＋０．００２８ｘ＿１一０．００５４ｘ＿２一０．０７４ｘ＿５）度，其中ｘ＿１、ｘ＿２和ｘ＿５分别为土壤碱解氨、有效磷和有机质含量。获得最高块根产量和最高纯经济效益施Ｐ＿２Ｏ＿５量分别为（一２５．６一０．１４０ｘ＿２＋５．０４ｘ＿４）ｋｇ／亩和（一２７．８一０．１４０ｘ＿２＋５．０４ｘ＿４）ｋｇ／亩（ｘ＿４为土壤ｐＨ值）。在最高纯经济效益施磷量下，平均每公斤Ｐ＿２Ｏ＿５增加块根（一６２．３一０．３７２ｘ＿２＋１３．４０ｘ＿４）ｋｇ，提高块根含糖率（０．６３＋０．００２０ｘ＿１一０．０７７ｘ＿４一０．０９０ｘ＿５）度。当土壤有效Ｋ＿２Ｏ含量大于１１０．６ｍｇ／ｋｇ土时，钾肥没有显著增产作用，只是有增产趋势；钾肥的增糖作用显著，每亩每公斤Ｋ＿２Ｏ提高含糖率０．００１４ｘ＿２度。
Based on the quadratic polynomial regression equation established from 1986 to 1993, the relationship between the requirements of nitrogen, phosphorus and potassium fertilizers and their effects on soil fertility was discussed. The results are as follows: The nitrogen application rates for obtaining the highest root yield and the highest net economic benefit are 9.41kg / mu and 7; 68kg / mu, respectively. Under the highest net economic benefit of nitrogen application, the average nitrogen content per kilogram of nitrogen increased 51.9kg, reducing the sugar content (0.10 + 0.0028x_1-0.0054x_2-0.074x_5) degrees, of which x_1, x_2 and x_5 were soil Alkaline ammonia, available phosphorus and organic matter content. The highest yield of root tuber and the highest pure economic benefit were (25.6 ± 0.140x_2 + 5.04x_4) kg / mu and (27.8 ± 0.140x_2 + 5.04x_4) kg / mu (x_4 is soil pH value). Under the highest phosphorus application rate, the average root tuber (62.3- 0.372x_2 + 13.40x_4) kg per kg P_2O_5 increased the sugar content (0.63 + 0.0020x_1-0.077x_4-0.090x_5) degree. When available K2O content was more than 110.6 mg / kg soil, there was no significant increase in yield of K fertilizer, but only a trend of increase in yield. The effect of K addition was significant. K2O per kilogram increased K2O content of 0.0014x2.