| Autor: |
Vargas, Amilcar, Singh, Gurbir, Kaur, Gurpreet, Lo, Tsz Him, Spencer, G. D., Krutz, L. Jason, Gholson, Drew M. |
| Předmět: |
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| Zdroj: |
Agrosystems, Geosciences & Environment; Mar2024, Vol. 7 Issue 1, p1-14, 14p |
| Abstrakt: |
Crop yields are adversely affected by nitrogen (N) losses in humid subtropical regions. This study was conducted to determine whether N dynamics could be manipulated through planting geometry and fertilizer placement. The effects of irrigation (irrigated and rainfed), row pattern (single‐ and twin‐row), and N placement (surface dribble, one knife, two knives, and control) on corn (Zea mays L.) productivity and N use efficiency were investigated at Leland, Mississippi, on a Bosket very fine sandy loam. The total N rate was split into two equal halves of 128 kg N ha−1 at V2 and V6 growth stages. The effects of row pattern and N placement were consistent between irrigated and rainfed environments. There was no interaction between row pattern and N placement nor did row pattern affect corn productivity or N use efficiency parameters. In 2020, when less than 30 mm of rainfall occurred from the first N application through 2 weeks after the last N application, corn grain yield and agronomic N efficiency were not different among placement methods and averaged 11.1 Mg ha−1 and 20.3 kg grain kg−1 fertilizer N, respectively. However, in 2021, applying N with one knife increased corn grain yield by 7% to 14% compared to the two knives and surface dribble application methods; in that year, 235 mm of rainfall occurred from the first N application through 2 weeks after the last N application. Applying N with one knife appears to consistently improve crop productivity and N use efficiency parameters for both irrigated and rainfed environments. Core Ideas: Weather (i.e., rainfall) influenced nitrogen (N) availability and corn productivity in the Mississippi Delta.Irrigation during reproductive growth stages increased yield by 9.3% compared to rainfed in 2021.Row pattern configurations had minimal effect on crop productivity and N dynamics.Corn yield in the surface dribble was 12.4% less compared to one‐knife placement in 2021. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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