Author(s)

Listowel Aditwin Akologo¹, Harrison Kwame Dapaah², Julius Yirzagla³

¹Gbewaa College of Education, Pusiga-Bawku, Ghana.
²Akenten Appiah-Menka University of Skills Training and Entrepreneurial Development, Mampong Campus, Mampong, Ghana.
³CSIR-SARI, Nyankapla, Ghana.

Legumes constitute a major component of sustainable cropping systems due to their biological nitrogen fixing potential. A field study was conducted in 2020 and 2021 at Ashanti-Mampong in the forest transition zone of Ghana to quantify nitrogen credits to carrot from early (70 - 75 days) and medium maturing (80 - 85 days) cowpea varieties (Asetenapa and Soronko) respectively, and Obatanpa maize variety as a reference crop. The experimental design was a split plot with five Nitrogen levels (0, 30, 45, 60 and 90 N kg/ha) applied to carrot as sub-plots following the legumes and the maize variety as main plots. NPK (15:15:15) was applied at the rate of 250 kg/ha to provide the nitrogen. The sub-plot treatments (0, 30, 45, 60 and 90 N kg/ha) were planted following the two cowpea varieties and the maize variety as a reference crop. Soronko had the highest number of nodules (176) while Asetenapa had the lowest nodules (55). Nitrogen credit to carrot from the early-maturing cowpea (Asetenapa) was 32 N kg/ha in the first year of incorporation and 18 N kg/ha in the second year after incorporation. N-credit from the medium-maturing cowpea (Soronko) was 18 N kg/ha and 29 N kg/ha in the first and second year after incorporation respectively. Obatanpa maize variety with 0 kg N/ha fertilizer level produced the lowest carrot yield, indicating that the soil amendment increased yields. The species and maturity of legumes are important determinants of their N credit contribution to crops in rotation.

N-Credit, Sustainable, Cropping Systems, Incorporation, Nitrogen Fixation

Akologo, L. , Dapaah, H. and Yirzagla, J. (2023) N-Credits from Different Maturing Cowpea Varieties to Carrot in Rotation. American Journal of Plant Sciences, 14, 482-495. doi: 10.4236/ajps.2023.144032.