In:
Agronomy Journal, Wiley, Vol. 112, No. 3 ( 2020-05), p. 1828-1838
Abstract:
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.
Type of Medium:
Online Resource
ISSN:
0002-1962
,
1435-0645
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
1471598-3
