Comprehensively Evaluating Soil Nutrients in Spring Wheat (Triticum aestivum) Field under Regulated Deficit Irrigation in an Arid Environment

Abstract:

A field experiment was carried out in 2007 and 2008 growing seasons to explore the comprehensive evaluation of soil nutrients in spring wheat field under regulated deficit irrigation (RDI) in an arid environment. The soil organic matter, soil total and available nitrogen, phosphorus, and potassium in 0~40 cm layer after two years of RDI management were selected as the evaluating factors to determine both the weighing coefficient of each soil nutrient component and the comprehensive evaluation index for soil nutrients (CEISN) using the membership function in fuzzy mathematics. The results showed that the CEISN was higher in all the RDI management than that in the no water deficit control except 3.5% lower in RDI2 over CK. The CEISN improvement was respectively 6.3%, 6.1%, 6.1%, 5.3%, 4.9%, and 3.8% higher in RDI7, RDI4, RDI5, RDI1, RDI3, RDI6 than in CK sequentially. Consequently, after two years of experiment, the optimal water management and sustainable soil nutrient use pattern was maintained in RDI7 due to its maximum CEISN in all the water deficit regulation regimes.

• Periodical: Advanced Materials Research (Volume 773)
• Pages: 837-843
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.773.837
• Online since: September 2013
• Authors: Heng Jia Zhang, Jun Hui Li
• Keywords: Comprehensive Evaluation Index, Regulated Deficit Irrigation, Soil Nutrients, Spring Wheat, Weighing Coefficient

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