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| Effects of long-term fertilization on soil water and nutrient with Triticum aestivum L. succession in dryland of Loess Plateau |
| Wei Feng1, 2, Hao Mingde2 |
| 1. College of Environment Science and Engineering, Key Subject of Soil and Water Conservation & Desertification Control, Southwest Forestry University, 650224, Kunming；2. Institute of Soil and Water Conservation, Northwest A & F University, 712100,Yangling, Shaanxi: China |
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Abstract To provide reference for reasonable use of water and fertilizer resources in dry-land of Loess Plateau，the study on the change of soil nutrient and water was conducted under the condition of 22-year Triticum aestivum L. succession based on the long-term fertilizer experiment. The six treatments were no fertilizer (CK), nitrogen fertilizer (N), phosphate fertilizer (P), manure fertilizer (M), nitrogen and phosphate fertilizers (NP), nitrogen and phosphate fertilizers with manure (NPM). Nutrient in tilth soils (0-20cm), and water contents and water storage in soil profiles (0-300cm) were measured. The results showed that for the contents of soil organic matter, total N, total P, available N, available P, and available K in tilth soils, they increased by 55.44%, 45.24%, 29.63%, 67.16%, 186.96% and 123.65%, respectively, after long-time M application. For contents of soil organ matter, total N, total P, available N, available P, and available K in tilth soils, they increased by 65.67%, 50.00%, 40.74%, 72.37%, 324.58% and 191.17%, respectively, after long-time NPM application. The water contents in tilth soils were 18.19%, 17.99%, 17.66%, 17.42%, 16.96% and 16.29% after long-time NPM, M, P, CK, N and NP treatments, respectively. The distribution characteristics of water contents in soil profile were similar for long-time NPM, M and NP treatments. The water storage of 0-300cm soil layers were 666.73, 656.23, 629.41, 536.88, 504.26 and 488.47mm in the P, CK, N, NP, M and NPM treatments, respectively. Compared to the CK, the wate storage in the P treatment increased by 1.60%, but decreased by 4.09% in the N treatment, 18.19%in the NP treatment, 23.16% in the M treatment and 25.56% in the NPM treatment. The long-term application of single manure and chemical fertilizer combined with manure could increase nutrient and water contents in tilth soils. The water storage in 0-300cm soil layers significantly decreased by the long-term application of single manure and chemical fertilizer combined with manure.
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Received: 16 December 2010
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