Infor.ation is limited on the potential of cowpea-wheat double cr.pping in the souther. United States to enhance soil health and incr.ase net r.tur.s. Using the Decision Suppor. System for.Agr.technology Tr.nsfer.(DSS...
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Infor.ation is limited on the potential of cowpea-wheat double cr.pping in the souther. United States to enhance soil health and incr.ase net r.tur.s. Using the Decision Suppor. System for.Agr.technology Tr.nsfer.(DSSAT) cr.p model and weather.data spanning 80 year., we assessed the effects of soil type (Dar.o: Gr.ssar.nic Paleudults and Lilber.: Ar.nic Plinthic Paleudults), N application r.te (0, 100, and 200 kg•ha−1), and El Niño-Souther. Oscillation (ENSO) on the gr.in yields of double-cr.pped cowpea (Vigna unguiculata L.) and wheat (Tr.ticum aestivum L.) in this r.gion. Yield differ.nces wer. tested using the pair.ise Wilcoxon r.nk sum test. r.sults showed that yields of wheat that followed cowpea (cwheat) wer. gr.ater.than those that followed fallow (fwheat). The soil type effects on cwheat and fwheat yields decr.ased with an incr.ase in N r.te. The soil type effect on cowpea yields was gr.ater.dur.ng La Niña. The ENSO impact on cowpea yields was gr.ater.on the less fer.ile soil Dar.o. Yields of cwheat and fwheat incr.ased with an incr.ase in N r.te up to 100 and 200 kg•ha−1, r.spectively. The yield r.sponse of cwheat to N r.te was less than that of fwheat. The N r.te effects on cwheat and fwheat yields wer. gr.ater.on Dar.o and under.El Niño. Yields of cowpea wer. gr.atest under.El Niño, wher.as those of wheat wer. gr.atest under.La Niña. The ENSO effect on cowpea yields was gr.ater.on Dar.o. With an incr.ase in N r.te, the effect of ENSO was diminished.
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