Pedosphere 31(1): 94--102, 2021
ISSN 1002-0160/CN 32-1315/P
©2021 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effect of P fertilizer reduction regime on soil Olsen-P, root Fe-plaque P, and rice P uptake in rice-wheat rotation paddy fields
Hao CHEN1,2, Yu WANG1, Jiahui YUAN1, Wenbin ZHU1, Guanglei CHEN1,3, Shenqiang WANG1
1State Key Laboratory of Soil and Sustainable Agriculture, Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China)
2College of Resource and Environment, University of Chinese Academy of Sciences, Beijing 100049(China)
3College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095(China)
      In agricultural systems, it is vital to use limited yet optimal phosphorus (P) resources, because excessive P fertilizer application leads to the accumulation of P in soil, increasing the risk of environmental pollution and causing the waste and exhaustion of P resources. In a rice-wheat rotation system, omitting P fertilizer application in the rice-growing season is a good alternative; however, how this P fertilization reduction influences changes in P in the soil-root-aboveground system is unclear. In this study, after a seven-year rice-wheat rotation at the Yixing (YX) and Changshu (CS) sampling sites, China, compared with P fertilization in rice- and wheat-growing seasons (PR+W), reduced P fertilization (no P fertilizer application in either season, P0; P fertilization only in wheat-growing seasons, PW; and P fertilization only in rice-growing seasons, PR) did not result in substantial variation in crop biomass. The PW treatment did not reduce crop total P, root iron (Fe)-plaque P, and soil Olsen-P at three stages of rice growth (seedling, booting, and harvesting stages) at the YX and CS sites. In contrast, concentrations of soil Olsen-P, aboveground crop total P, and root Fe-plaque P decreased in the P0 treatment by 45.8%-81.0%, 24.6%-30.9%, and 45.6%-73.4%, respectively. In addition, a significant negative correlation was observed between the root Fe-plaque P and crop biomass at the two sites. Significant positive correlations were also observed between root Fe-plaque P and root total P, crop total P, and soil Olsen-P. In addition, the results of a redundancy analysis revealed that soil alkaline phosphatase (ALP) played a major role in the supply of P in soil, and was closely associated with root Fe-plaque P. The results of this study will enhance the understanding of the changes in P in the soil-root-aboveground system, particularly under P fertilizer reduction regimes.
Key Words:  crop biomass,crop total P,iron plaque,reduced P input,rice-growth stage,soil-root-aboveground system
Citation: Chen H, Wang Y, Yuan J H, Zhu W B, Chen G L, Wang S Q. 2021. Effect of P fertilizer reduction regime on soil Olsen-P, root Fe-plaque P, and rice P uptake in rice-wheat rotation paddy fields. Pedosphere. 31(1): 94-102.
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