Assessing Cowpea-Wheat Double Cropping Strategies in the Southern United States Using the DSSAT Crop Model

Woli, Prem; Smith, Gerald R.; Long, C. R.; Rouquette, F. M.

doi:10.4236/as.2022.136049

Cited by 2 publications

(5 citation statements)

References 35 publications

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“…Our finding of the greater yields under El Niño for the semi-arid region of Llano Estacado, however, did not agree with those found for the humid region of Piney Woods [32]. In the Piney Woods case, the grain yields of winter wheat were greatest under the La Niña phase.…”

Section: The Enso Effect On Mono-cropped Wheat Yieldscontrasting

confidence: 96%

“…Although the ENSO effect on m cowpea yields was significant only for the July 15 planting date, the El Niño years tended to produce more cowpea yields than did the La Niña years, especially for the crops planted in July (Table 3, Figure 3). The m cowpea yields associated with the crops planted in July were about 10% greater in the El Niño years compared with the normal yield, an average yield of the entire 81 seasons (Figure 3 These results were in agreement with those found for Piney Woods, a humid vegetational region in the southern US [32]. In that region, irrespective of soil type and N application rate to wheat, the cowpea yields under El Niño years were significantly greater than those under La Niña.…”

Section: The Enso Effect On Mono-cropped Cowpea Yieldssupporting

confidence: 83%

“…For this reason, a number of studies have been conducted to explore associations between various field crops in this region and ENSO [21]- [31]. For Piney Woods, a humid region in the southern US, reference [32] studied the effects of ENSO on cowpea and wheat as influenced by soil type and N application rate. For the Texas High Plains, a semi-arid region in the southern US, on the other hand, reference [33] evaluated ENSO effects on wheat and grain sorghum using about 19 years' yield data on each crop.…”

Section: Introductionmentioning

confidence: 99%

“…The influences of planting date on the effect of ENSO on cotton and peanut yields in Georgia, US, were studied by references [24] and [25], respectively. The ENSO effect on cowpea and wheat yields as influenced by N application rate was studied by reference [32] for the humid region of the southern US. For the semi-arid region of the southern US, however, no study has examined the ENSO impacts on cowpea and wheat yields as influenced by planting date and N application rate.…”

Section: Introductionmentioning

confidence: 99%

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The El Ni&#241;o-Southern Oscillation (ENSO) Effects on Cowpea and Winter Wheat Yields in the Semi-Arid Region of the Southern US

Woli¹,

Smith²,

Long³

et al. 2023

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Information is limited on the effects of climate variability on cowpea (Vigna unguiculata L.) and winter wheat (Triticum aestivum L.) yields in the semiarid region of the southern US. Using the Decision Support System for Agrotechnology Transfer (DSSAT) crop model and weather data spanning 81 years, we assessed the impact of El Niño-Southern Oscillation (ENSO) on the grain yields of these crops in the Llano Estacado region of the southern US as affected by cowpea and wheat planting dates and N application rate. Simulated results showed that the El Niño phase of ENSO produced about 30% more yields of mono-cropped cowpea than those produced under the La Niña phase, especially with the cowpeas planted in July. The cowpea yields under El Niño were about 10% more than the 81-year average normal yield, whereas those under La Niña were about 20% less. At the N rates of 0, 50, and 100 kg·ha −1 , regardless of wheat planting dates, the El Niño years produced, respectively, about 8%, 40%, and 60% higher wheat yields than those produced in the La Niña years, and about 5%, 20%, and 27% more than the 81-year average normal yield. In the La Niña years, the wheat yields at 0, 50, and 100 kg N ha −1 were, respectively, about 5%, 15%, and 20% less than the normal yield with similar N levels. The impact of ENSO on wheat yields under cowpea-wheat double-cropping systems was significant, especially for the wheat crops planted on October 15 (October 30) or later following the cowpea crops planted in June (July). At zero N, the mono-cropped wheat yields were not impacted by ENSO due to N limitation. However, the double-cropped wheat yields were impacted by ENSO even when no N fertilizer was applied due to high soil N status caused by N transfer from cowpea stover residues and roots. Results indicated that management strategies need to be attentive to ENSO forecasts and adjust potential planting dates and N application rates with the ENSO phase to avert risks of crop failure and economic loss.

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Section: The Enso Effect On Mono-cropped Wheat Yieldscontrasting

confidence: 96%

Section: The Enso Effect On Mono-cropped Cowpea Yieldssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The El Ni&#241;o-Southern Oscillation (ENSO) Effects on Cowpea and Winter Wheat Yields in the Semi-Arid Region of the Southern US

Woli¹,

Smith²,

Long³

et al. 2023

Self Cite

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“…More information is needed regarding the total crop production potential and limitations of cowpea-wheat double cropping in the southern United States to help increase productivity while enhancing soil health. Reference [7] conducted a simulation modeling study to examine the effects of cowpea-wheat crop sequence, soil type, N application rate, El Niño-Southern Oscillation (ENSO), and their interactions on the grain yields of cowpea and winter wheat in the humid region of the southern United States. However, no study has assessed the relationships among cowpea-winter wheat double-cropping, N application rate, and P. Woli et al planting date for the semi-arid region of the southern United States.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Potential of Cowpea-Wheat Double Cropping in the Semi-Arid Region of the Southern United States Using the DSSAT Crop Model

Woli¹,

Smith²,

Long³

et al. 2023

Self Cite

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Information is limited on the potential of double-cropping cowpea (Vigna unguiculata L.) and wheat (Triticum aestivum L.) in the semiarid region of the southern United States. Using the Decision Support System for Agrotechnology Transfer (DSSAT) crop model and weather data of 80 years, we assessed the possibility of cowpea-wheat double-cropping in this region for grain purpose as affected by planting date and N application rate. Results showed that the possibility of double-cropping varied from 0% to 65%, depending on the cropping system. The possibility was less with systems comprising earlier planting dates of wheat and later planting dates of cowpea. Results indicated that cowpea-wheat double-cropping could be beneficial only when no N was applied, with wheat planted on October 15 or later. At zero N, the double-crops of cowpea planted on July 15 and wheat planted on November 30 were the most beneficial of all the 72 double-cropping systems studied. With a delay in planting cowpea, the percentage of beneficial doublecropping systems decreased. At N rates other than zero, fallow-wheat monocropping systems were more beneficial than cowpea-wheat double-cropping systems, and the benefit was greater at a higher N rate. At 100 kg N ha −1 , the monocrop of wheat planted on October 15 was the most beneficial of all the 94 systems studied. Results further showed that fallow-wheat yields increased almost linearly with an increase in N rate from 0 to 100 kg•ha −1 . Fallow-wheat grain yields were quadratically associated with planting dates. With an increase in N rate, wheat yields reached the peak with an earlier planting date. Wheat yields produced under monocropping systems were greater than those produced under double-cropping systems for any cowpea planting date.

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Assessing Cowpea-Wheat Double Cropping Strategies in the Southern United States Using the DSSAT Crop Model

Cited by 2 publications

References 35 publications

The El Ni&#241;o-Southern Oscillation (ENSO) Effects on Cowpea and Winter Wheat Yields in the Semi-Arid Region of the Southern US

The El Ni&#241;o-Southern Oscillation (ENSO) Effects on Cowpea and Winter Wheat Yields in the Semi-Arid Region of the Southern US

Exploring the Potential of Cowpea-Wheat Double Cropping in the Semi-Arid Region of the Southern United States Using the DSSAT Crop Model

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Assessing Cowpea-Wheat Double Cropping Strategies in the Southern United States Using the DSSAT Crop Model

Cited by 2 publications

References 35 publications

The El Ni&amp;#241;o-Southern Oscillation (ENSO) Effects on Cowpea and Winter Wheat Yields in the Semi-Arid Region of the Southern US

The El Ni&amp;#241;o-Southern Oscillation (ENSO) Effects on Cowpea and Winter Wheat Yields in the Semi-Arid Region of the Southern US

Exploring the Potential of Cowpea-Wheat Double Cropping in the Semi-Arid Region of the Southern United States Using the DSSAT Crop Model

Contact Info

Product

Resources

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The El Niño-Southern Oscillation (ENSO) Effects on Cowpea and Winter Wheat Yields in the Semi-Arid Region of the Southern US

The El Niño-Southern Oscillation (ENSO) Effects on Cowpea and Winter Wheat Yields in the Semi-Arid Region of the Southern US