Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 1998, Vol. 9 ›› Issue (3): 176

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Nitrogen utilization and transformation in red soil fertilized with urea and ryegrass

Wu Gang1, Zhang Qin-Zheng1, Ye Qing-Fu1, Zhu Zhu-Jun1, Xi Hai-Fu1,He Zhen-Li2   

  1. 1 Institute of Nuclear- Agricultural Sciences, Zhejiang Agricultural University, Hangzhou 310029;
    2 Department of Soil Science and Agricultural Chemistry, Zhepiang Agricultural University, Hangzhou 310029
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Wu Gang, Zhang Qin-Zheng, Ye Qing-Fu, Zhu Zhu-Jun, Xi Hai-Fu, He Zhen-Li. Nitrogen utilization and transformation in red soil fertilized with urea and ryegrass.Nuclear Science and Techniques, 1998, 9(3): 176

Abstract: The influence of fertilization with urea and ryegrass on nitrogen utilization and transformation in red soil has been studied by using 15N tracer method. When urea and ryegrass were applied alone or in combination, the percentage of N uptaken by ryegrass from labelled urea was 3 and 1.7 times that from labelled ryegrass for the application rate of 200mgN·kg-1 and 100 mgN·kg-1, respectively; combining application of ryegrass and urea reduced uptake of urea N and increased uptake of ryegrass N by ryegrass plant, but the percentage of N residued in soil increased for urea and decreased for ryegrass; when urea and ryegrass were applied alone, the percentage of N residued in soil from labelled ryegrass was more than 69% while that from labelled urea was less than 25%, and much more ryegrass N wae ineoernes tad trie rome Mee nren B.

Key words: Nitrogen, Utilization, Transformation, Red soil, Ryegrass