Replacing Compound Fertilizer by Manure Promotes the Growth and Development of Brassica campestris L.ssp.chinensis var.utilis
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%.
万方数据
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