关键词: 有机肥;无机肥;早稻;产量;养分吸收;土壤肥力

Abstract:

Effects of different fertilizer structures on grain yield, yield construction, nutrient uptake in early rice and soil fertility were studied using a 22-year long term experiment under double rice-rapeseed rotation system. Six treatments were designed including no fertilizer (CK), NPK, NK, NP, 30% organic manure (30%OM) and 60% organic manure (60%OM). The results showed that the grain and biomass yields in early rice were obviously increased with long-term combined application of organic manure and inorganic fertilizer. The highest and higher rice yields were observed in 30%OM treatment and 60%OM treatment with the increasing rate of 131.58% and 11908%, compared with the CK. Chemical fertilizers application combined with organic manure could promote NPK nutrient absorption. Compared with NPK treatment, the total nutrient absorption(N+P+K) of rice grain were increased by 3.90% and 1.05% within 30% OM treatment and 60% OM treatment, respectively, and compared with CK treatment, which were increased by 135.65% and 129.19%, respectively. Positive effect on soil fertility was also observed in treatments of inorganic fertilizers application combined with organic manure. Rice grain yield, nutrient uptake amount of rice plant, soil organic matter, total N, available N, and available P were all obviously lower than the other treatments, except the CK, which indicated that phosphorus is one of the major factors restricting crop growth in early rice and phosphorus should be applied in early rice production of this area.

Key words: organic fertilizer, inorganic fertilizer, early rice, yield, nutrient uptake, soil fertility