Pedosphere 28(3): 411--421, 2018
ISSN 1002-0160/CN 32-1315/P
©2018 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Estimation of the Effects of Maize Straw Return on Soil Carbon and Nutrients Using Response Surface Methodology
ZHOU Dongxing1, SU Ye1, NING Yucui1, RONG Guohua1, WANG Guangdong1, LIU Di1, LIU Liyan2
1College of Resources and Environmental Science, Northeast Agricultural University, Harbin 150030(China)
2Publicity and United Front Work Department, Northeast Agricultural University, Harbin 150030(China)
Corresponding Author:ZHOU Dongxing
ABSTRACT
      Straw incorporation is generally considered an effective agricultural management practice that improves nutrient cycling and maintains soil fertility. To study the interactive effects of straw returning factors on soil organic carbon and available nutrients, a 17-month (May 6, 2016 to October 6, 2017) experiment was conducted on straw incorporation by using response surface methodology under a three-factor (straw length, amount, and burying depth), five-level quadratic orthogonal rotation experimental design. Weight was assigned to each indicator for soil carbon and nutrients and then a comprehensive indicator was established. Then, a second-order polynomial model of the three straw returning factors was established using response surface methodology. Results indicated that 17 months after straw incorporation, straw amount and burying depth had significant effects on the comprehensive indicator of soil carbon and nutrients. Straw length and the interactions of straw amount and burying depth showed no significant effects on the comprehensive indicator of soil carbon and nutrients. It was concluded that 17 months after straw incorporation, the highest value of the comprehensive indicator of soil carbon and nutrients was achieved when the straw length, amount, and burying depth were approximately 17-20 cm, 740-840 g m-2, and 9-13 cm, respectively, which can be recommended as the most suitable parameters for use in straw returning in the study area.
Key Words:  agricultural management practice,soil fertility,soil organic carbon,straw amount,straw burying depth,straw length,straw returning factors
Citation: Zhou D X, Su Y, Ning Y C, Rong G H, Wang G D, Liu D, Liu L Y. 2018. Estimation of the effects of maize straw return on soil carbon and nutrients using response surface methodology. Pedosphere. 28(3):411-421.
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