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Individual study: Dynamics of crop yields and soil organic carbon in a long-term fertilization experiment in the Huang-Huai-Hai Plain of China

Published source details

Cai Z.C. & Qin S.W. (2006) Dynamics of crop yields and soil organic carbon in a long-term fertilization experiment in the Huang-Huai-Hai Plain of China. Geoderma, 136, 708-715


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Amend the soil using a mix of organic and inorganic amendments Soil Fertility

A controlled, randomized, replicated experiment in 1990-2003 on sandy-loam in Fengqiu, China (Cai & Qin 2006) found that soil organic carbon increased by 12.2 Mg C/ha in the manure treatment, 7.8 Mg C/ha in the mixed, and 3.7 Mg C/ha in the nitrogen/phosphorus/potassium (NPK) treatments compared to the control, which lost 1.4 Mg C/ha. Wheat Triticum aestivum and maize Zea mays yields were 1.9% and 1.5% lower (respectively) in the mixed fertilizer treatment, and 23.7% and 18% lower  with manure-only than in the NPK treatment (5,261 and 7 808 kg/ha), in which yields were highest and most stable. A long-term wheat-maize rotation had the following treatments: inorganic fertilizer (NPK, NP, PK or NK), organic manure fertilizer, mixed nitrogen addition comprising half inorganic fertilizer and half compost (wheat straw, soybean Glycine max and cotton Gossypium herbaceum seed cake); and no fertilizer (control). Each treatment was replicated four times in 45.5 m2 plots.