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Grain yield, and nitrogen uptake and translocation of peanut under different nitrogen management systems in a wheat–peanut rotation
Author(s) -
Liu Zhaoxin,
Gao Fang,
Li Ying,
Zhao Jihao,
Wang Ying,
Wang Zhaoyi,
Li Yuerong,
Li Xiangdong,
Yang Dongqing
Publication year - 2020
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.1002/agj2.20065
Subject(s) - intercropping , agronomy , sowing , nitrogen , point of delivery , yield (engineering) , arachis hypogaea , rotation system , fertilizer , anthesis , urea , crop , chemistry , mathematics , biology , cultivar , materials science , organic chemistry , metallurgy
Better N fertilizer management is essential for improving crop productivity and reducing N losses to the environment. However, few studies have reported N absorption, use, and balance in a wheat ( Triticum aestivum L.)–peanut ( Arachis hypogaea L.) relay intercropping system. This study aimed to determine the effects of different N application rates and ratios at different maturation stages on the yield and N use of peanut in this system. Nitrogen (300 kg ha −1 ) was applied the day before sowing and at jointing, booting, and anthesis in peanut at the following ratios: 50–50–0–0 (N1), 35–35–0–30% (N2), and 35–0–35–30 (N3) (control: 0 kg ha −1 ). Nitrogen isotope‐labeled urea was used under the same conditions in microplot. Peanut pod yield increased by 19.0 and 24.8% under the N2 and N3 treatments, respectively, compared with the N1 treatment. Applying N at three stages and withholding N until booting improved the N derived from fertilizer in peanut, promoted the distribution of 15 N to pods, and increased pod yield. The 15 N experiment revealed that N uptake at different growth stages of peanut was 20.7 to 30.4% higher under N3 than under N2, increasing N harvest index and apparent N recovery efficiency compared with N2. The N3 treatment also significantly increased the N recovery efficiency and the agronomic N use efficiency and reduced the apparent N loss. Therefore, applying N fertilizer as in the N3 treatment could be appropriate for wheat–peanut relay intercropping systems in China.