Pedosphere 30(6): 832--843, 2020
ISSN 1002-0160/CN 32-1315/P
©2020 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Determining the optimum range of soil Olsen P for high P use efficiency, crop yield, and soil fertility in three typical cropland soils
Qihua WU1,2, Shuxiang ZHANG1, Gu FENG3, Ping ZHU4, Shaomin HUANG5, Boren WANG1, Minggang XU1
1Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081(China)
2Guangdong Provincial Bioengineering Institute(Guangzhou Sugarcane Industry Research Institute)/Guangdong Key Laboratory of Sugarcane Improvement and Biorefinery, Guangzhou 510316(China)
3College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094(China)
4Centre of Agricultural Environment and Resources, Jilin Academy of Agricultural Sciences, Changchun 130033(China)
5Institute of Plant Nutrition, Resources and Environment, Henan Academy of Agricultural Sciences, Zhengzhou 450002(China)
      Soil Olsen P level has a major influence on crop yield, efficient P utilization, and soil fertility. In this study, the optimum Olsen P range was determined from long-term (1990-2012) field experiments in three typical soil types of China under single cropping of maize or double cropping of maize and wheat. The critical soil Olsen P value for crop yield was evaluated using three different models, and the relationships among P use efficiency (PUE), Olsen P, and total P were analyzed. The agronomic critical soil Olsen P values obtained from the three models for the neutral soil of Gongzhuling and the calcareous soil of Zhengzhou were similar; however, the values from the linear-linear and linear-plateau models for both maize and wheat were substantially lower than those from the Mitscherlich model for the acidic soil of Qiyang. The PUE response change rates (linear equation slopes) under different soil Olsen P levels were small, indicating slight or no changes in the PUE as the soil Olsen P increased in all three soils. A comparison of the Olsen P levels that achieved the maximal PUE with the agronomic critical values derived from the three models indicated that the linear-plateau model exhibited the best performance. The regression equation coefficients of Olsen P response to total P decreased as follows:Zhengzhou (73 mg g-1) > Qiyang (65 mg g-1) > Gongzhuling (55 mg g-1). The Olsen P level increased as the total P increased, which may result in a decrease in PUE. To achieve a relatively high crop yield, PUE, and soil fertility, the optimum Olsen P range should be 13-40, 10-40, and 29-40 mg kg-1 at Gongzhuling, Zhengzhou, and Qiyang, respectively.
Key Words:  critical Olsen P value,efficient P utilization,long-term fertilization,P management,response curve,soil type
Citation: Wu Q H, Zhang S X, Feng G, Zhu P, Huang S M, Wang B R, Xu M G. 2020. Determining the optimum range of soil Olsen P for high P use efficiency, crop yield, and soil fertility in three typical cropland soils. Pedosphere. 30(6):832-843.
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