摘要
A systematic approach was adopted to investigate the nutrient limiting factors in gray-brown purple soils and yellow soils derived from limestone in Chongqing, China, to study balanced fertilization for corn, sweet potato and wheat in rotation. The results showed that N, P and K were deficient in both soils, Cu, Mn, S andZn in the gray-brown purple soils and Ca, Mg, Mo and Zn for the yellow soils. Balanced fertilizer application increased yields of corn, sweet potato and wheat by 28.4%, 28.7% and 4.4%, respectively, as compared to the local farmers' practice. The systematic approach can be considered as one of the most efficient and reliable methods in fertility study.
A systematic approach was adopted to investigate the nutrient limitingfactors in gray-brown purple soils and yellow soils derived from limestone in Chongqing, China, tostudy balanced fertilization for corn, sweet potato and wheat in rotation. The results showed thatN, P and K were deficient in both soils, Cu, Mn, S and Zn in the gray-brown purple soils and Ca, Mg,Mo and Zn for the yellow soils. Balanced fertilizer application increased yields of corn, sweetpotato and wheat by 28.4%, 28.7% and 4.4%, respectively, as compared to the local farmers' practice.The systematic approach can be considered as one of the most efficient and reliable methods infertility study.
