Effects of Organic Fertilizer Substituting Chemical Nitrogen Fertilizer on Nitrogen Content in the Surface Water and Soil of Paddy Field in the Erhai Lake Basin

doi:10.3969/j.issn.1000-6362.2018.04.005

Abstract

Abstract: Aiming at the non-point source pollution problem caused by nitrogen fertilization in paddy fields of Erhai Lake basin, a field experiment was conducted during 2015-2016 in paddy field with different soil fertility condition, including no nitrogen fertilizer (CK), inorganic nitrogen fertilizer (F), organic manure completely substituting ?chemical nitrogen fertilizer (M) and organic manure substituting?half chemical nitrogen fertilizer (MF) under the same amount of total nitrogen input. We got the results by comparing different treatments in dynamic change of total nitrogen (TN), dissolved total nitrogen (DTN), ammonium (NH4+?N), and nitrate (NO3??N). The results indicated that the content of TN, DTN, NH4+?N and NO3??N reached its peak after 1-4 days of fertilization for each treatment, then the content decreased gradually, the period within a month after fertilization was critical period to prevent nitrogen runoff loss. (2)The content of TN and DTN were relatively high within a month of fertilization of MF treatment, which extended the critical period of nitrogen loss. (3) At harvest, both of M and MF treatment could improve the content of soil total nitrogen at 0-20cm soil and changed the form of soil inorganic nitrogen in topsoil. M treatment decreased total nitrogen content and increased nitrogen loss at 20-50cm soil, compared with F and MF. Soil mineralized nitrogen was dominated by NO3??N at 0-40cm in M treatment, while inorganic nitrogen was dominated by NH4+?N in MF and F treatment. Although organic manure substituting half chemical nitrogen fertilizer improved TN at 0-20cm soil, it extended the critical period of nitrogen loss. Thus, improvement of field water management and prevention of field drainage within a month after fertilization should be applied when extending combined application of organic manure and chemical fertilizer in Erhai Lake Basin.

Key words: Organic fertilizer substituting ?chemical nitrogen fertilizer, Erhai Lake basin, Soil total nitrogen, Nitrogen dynamic change, Rice yield

ZHANG Xue-li，DONG Wen-yi，LIU Qin，WANG Hong-yuan，YAN Chang-rong，LIU Hong-bin，. Effects of Organic Fertilizer Substituting Chemical Nitrogen Fertilizer on Nitrogen Content in the Surface Water and Soil of Paddy Field in the Erhai Lake Basin[J]. Chinese Journal of Agrometeorology, 2018, 39(04): 256-266.

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