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Effect of Long-Term Fertilization on Soil Productivity and nitrate accumulation in Gansu Oasis

Agricultural Sciences in China 2006年第1期5卷 57-67页

作者： YAnG Sheng-mao LI Feng-min SUO Dong-rang GUO Tian-wen WAnG Jian-guo SOnG Bing-ling JIn Shao-ling Institute of Soil and Fertilizer Gansu Academy of Agricultural Sciences Lanzhou 730070 P.R.China The Key Laboratory of Arid and Grassland Agroecology Lanzhou University Ministry of Education Lanzhou 730000 P.R.China Institute of Agricultural Sciences of Zhangye Prefecture Zhangye 734000 PR China

A long-term （1982-2001） field experiment was conducted in a calcareous soil under wheat （Triticum aestivum L.）-wheat （Triticum aestivum L.）-maize （Zea mays L.） rotation system at Zhangye, Gansu Province, China to determine the effects of long-term fertilization on crop yield, nutrients interactions, content and accumulation of nitrate-n in soil profiles. Twenty- four plots in a split-plot factorial with a combination of eight treatments （from nitrogen （n）, phosphorus （P）, potassium （K） and farmyard manure （M） applications） and 3 replications were selected. Main treatments were M and without M, and the sub-treatments were no-fertilizer （CK）, n, nP and nPK. When P and K fertilizers were part of treatments, their ratio to n was 1n：0.22P：0.42K. All M, P and K fertilizers were applied as the basal dressing. The grain yield was harvested each experimental period and straw yield for the period from 1988 to 1997. After crop harvest in 2000, the soil was sampled from the 0-20, 20-60, 60-100, 100-140 and 140-180 cm depths to determine nO3^--n content. Maize yield of CK in 2000 was only 28.2% of that in 1984, and wheat in 2001 was 25.7% of that observed in 1982. Average impact of fertilizers on grain yield decreased in the order of n 〉 M 〉 P 〉 K. Yield response to n and P fertilizers increased with progress of the experiment. The impact of K fertilizer showed no increase in grain yield during the initial 6 years （1982-1987）, moderate increase in the next 5 years （1988-1992）, and considerable increase in the last 9 years （1993-2001）. The straw yield trend was similar to grain yield. accumulation and distribution of nO3^--n in soil was significantly affected by annual fertilizations. Mineral fertilizers （nP and nPK） led to nO3^- -n accumulation in most subsoil layers, with major impact in the 20-140 cm depth. The combination of mineral fertilizers and farmyard manure （MnP and MnPK） reduced soil nO3^--n accumulation in comparison to mineral fertilizers, It can be argued that long

关键词： long-term fertilization accumulation of nitrate-n crop yields nutrients interactions farmyard manure nbalance sheet Zhangye Oasis

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