摘要
以白菜薹为试验材料,汉寿众依有机肥为供试肥料,调查有机肥替代复合肥不同比例条件下白菜薹农艺性状、土壤理化性质、产量和偏生产力,建立肥料施用量与产量的数学模型,筛选最佳施用比例,为白菜薹生产上有机肥替代复合肥的比例提供科学依据.结果表明:不同有机肥替代复合肥处理对白菜薹农艺性状和土壤理化性质等存在差异;根据肥料效应函数法,得到白菜薹产量(Y)与有机肥施用量(X)之间的肥料效应方程(二次多项式Y=-0.000 6X 2+3.008 1X+22 065,R2=0.564 3,三次多项式Y=-0.000 000 4X 3+0.002 4X 2-1.919 9X+23 036,R2=0.911 2),三次多项式的拟合度高于二次多项式.根据数学模型得出,白菜薹在一定有机肥施用量范围内,获得的最佳产量为 25 596.2 kg/hm2,有机肥的最佳投入量为 2 000 kg/hm2,即有机肥最佳替代比例介于 40%～60%之间.
Abstract
Compound fertilizer was replaced by manure produced by Hanshou Zhongyi in different proportions for the cultivation of Brassica campestris L.ssp.chinensis var.utilis.The agronomic traits,soil physical and chemical properties,yield,and partial factor productivity of this vegetable in different fertilizer treatments were investigated.The mathematical model of fertilizer application rate and yield was established to determine the optimal replacement proportion.The results showed that the agronomic traits and soil physical and chemical properties varied among the different fertilizer replacement treatments.The fertilizer response functions between the vegetable yield(Y)and manure application rate(X)were obtained as follows:quadratic polynomial Y=-0.000 6X 2+3.008 1X+22 065,R2=0.564 3;cubic polynomial Y=-0.000 000 4X 3+0.002 4X 2-1.919 9X+23 036,R2=0.911 2).The fitting degree of the cubic polynomial was higher than that of the quadratic polynomial.The highest yield of the vegetable was obtained as 25 596.2 kg/hm2 when the input of manure was 2 000 kg/hm2.That is,compound fertilizer should be replaced by manure in a proportion within the range of 40%-60%.
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