Assessing Cowpea-Wheat Double Cropping Strategies in the Southern United States Using the DSSAT Crop Model
Open Access
- 1 January 2022
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in Agricultural Sciences
- Vol. 13 (06), 758-775
- https://doi.org/10.4236/as.2022.136049
Abstract
Information is limited on the potential of cowpea-wheat double cropping in the southern United States to enhance soil health and increase net returns. Using the Decision Support System for Agrotechnology Transfer (DSSAT) crop model and weather data spanning 80 years, we assessed the effects of soil type (Darco: Grossarenic Paleudults and Lilbert: Arenic Plinthic Paleudults), N application rate (0, 100, and 200 kg•ha−1), and El Niño-Southern Oscillation (ENSO) on the grain yields of double-cropped cowpea (Vigna unguiculata L.) and wheat (Triticum aestivum L.) in this region. Yield differences were tested using the pairwise Wilcoxon rank sum test. Results showed that yields of wheat that followed cowpea (cwheat) were greater than those that followed fallow (fwheat). The soil type effects on cwheat and fwheat yields decreased with an increase in N rate. The soil type effect on cowpea yields was greater during La Niña. The ENSO impact on cowpea yields was greater on the less fertile soil Darco. Yields of cwheat and fwheat increased with an increase in N rate up to 100 and 200 kg•ha−1, respectively. The yield response of cwheat to N rate was less than that of fwheat. The N rate effects on cwheat and fwheat yields were greater on Darco and under El Niño. Yields of cowpea were greatest under El Niño, whereas those of wheat were greatest under La Niña. The ENSO effect on cowpea yields was greater on Darco. With an increase in N rate, the effect of ENSO was diminished.Keywords
This publication has 32 references indexed in Scilit:
- The ENSO effect on peanut yield as influenced by planting date and soil typeAgricultural Systems, 2013
- Is the change of winter wheat yield under warming caused by shortened reproductive period?Ecology and Evolution, 2012
- GIS and crop simulation modelling applications in climate change research.Published by CABI Publishing ,2010
- Maize ethanol feedstock production and net energy value as affected by climate variability and crop management practicesAgricultural Systems, 2009
- Intensification of agriculture in the south-eastern Pampas: I. Capture and efficiency in the use of water and radiation in double-cropped wheat–soybeanField Crops Research, 2004
- The DSSAT cropping system modelEuropean Journal of Agronomy, 2003
- Climate variation and crop production in Georgia, USA, during the twentieth centuryClimate Research, 2001
- Long‐Term Wheat, Soybean, and Grain Sorghum Double‐Cropping under Rainfed ConditionsAgronomy Journal, 1990
- Straw and Tillage Management Practices in Soybean‐Wheat Double‐Cropping1Agronomy Journal, 1982
- Individual Comparisons by Ranking MethodsBiometrics Bulletin, 1945