Farmland Soil Fertility in Qinba Area in 30 Years: Variation Characteristics and Fertilization Countermeasures

doi:10.11924/j.issn.1000-6850.casb18050106

Abstract

Abstract: The paper aims to find out the variation characteristics of soil fertility in Qinba area, and formulate the reasonable measures for fertilization management. We analyzed the soil nutrient test results of the soil testing and fertilization project during 2008-2012, and compared the soil nutrient data from the second soil survey during 1980-1982 to study the variation characteristics of soil fertility in the region in past 30 years. The results showed that: the average values of soil organic matter, total nitrogen, available nitrogen, available phosphorus and available potassium were 20.1 g/kg, 1.16 g/kg, 108.9 mg/kg, 17.9 mg/kg and 113.7 mg/kg during 2008-2012, respectively, and compared with the average values from the second soil survey during 1980-1982, the soil organic matter, available nitrogen and available phosphorus increased by 18.2%, 46.5%, and 113.1%, respectively, and the total nitrogen increased slightly, available potassium decreased slightly. At present, the soil fertility level in Qinba area is high and the production potential is large. It is suggested that the traditional fertilization method should be changed; the application of nitrogen fertilizer should be based on the principle of precision; the application of phosphorus fertilizer should be changed into topdressing; returning straw to the field controls the input of nitrogen fertilizer and phosphate fertilizer; increase the application of potassium fertilizer and organic fertilizer, all achieve a balanced increasing in regional soil fertility.

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