Effects of soil variation on CROPWAT modelled irrigation water requirements of okra (Abelmoschus esculentus) under derived Savannah and humid forest agro-ecological zones of Nigeria
Accurate quantification of irrigation water requirement at different physiological growth stages of okra (Abelmoschus esculentus L.) life cycle is important to prevent over- or under-irrigation. Field experiments were therefore initiated to model okra irrigation water requirements at the four physiological growth stages of okra life cycle using CROPWAT model. Derived Savannah 1 (DS1), derived Savannah 2 (DS2) and humid forest (HF) occupying 493.36, 69.83 and 305.25 ha, respectively, were used. Some selected soil physical properties coupled with weather parameters were used to develop irrigation water requirements for okra crop. In DS1, the estimated crop co-efficient (Kc) values were 0.30, 0.52, 0.84 and 0.7 for the germination, crop growth, flowering and fruiting stages, respectively. Corresponding Kc values in DS2 were 0.30, 0.54, 0.90 and 0.84 and in the HF were 0.30, 0.56, 0.87 and 0.86, respectively. Daily crop evapo-transpiration values ranged from 1.16 to 3.36, 1.17 to 3.64, and 1.2 to 3.38 mm day-1 for DS1, DS2 and HF, respectively, with significant (p=0.05) peak at the flowering stage for the three locations. Sustainable okra cultivation would require maximum daily irrigation water at flowering stage (reproductive phase) to meet the crop physiological needs and evapo-transpiration demand of the atmosphere.
Aliku, O. and Oshunsanya, S.O. (2017). Effects of soil variation on CROPWAT modelled irrigation water requirements of okra (Abelmoschus esculentus) under derived Savannah and humid forest agro-ecological zones of Nigeria. Acta Hortic. 1182, 31-38
crop co-efficient, crop evapo-transpiration, soil properties, effective rainfall, okra