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Abstract:Field experiments were conducted at the Agricultural Engineering Experimental Farm of The Federal University of Technology, Akure, during 2006Akure, during /2007Akure, during and 2007Akure, during /2008 seasons to investigate the response of cassava under drip irrigation. The experiment was laid out in a randomised complete block design (RCBD) with three replications. The treatments were based on four different water regimes; with T 100 receiving 100% available water (AW), T 50 and T 25 receiving 50% and 25% of AW and T 0 with zero irrigation (control treatment). Disease free stems of the cassava cultivar TMS 91934 were planted at a spacing of 1 m by 1 m. The results indicated that T 100 full treatment produced the highest average total dry matter yield of 49.12 and 37.62 t/ha in 2006/07 and 2007/08 cropping seasons, respectively. However, the average total dry matter production in T 50 , T 25 , and T 0 showed significant differences in their values. Low total dry matter yields of 7.12 and 5.92 t/ha, respectively, were associated with T 0 for the two cropping seasons. The total water use of 1491.75 and 1701.13 mm was recorded for T 100 , while total water use of 729.00 and 651.13 mm were obtained for T 0 in the two cropping seasons. The water use efficiency determined for the two cropping seasons ranged between 7.38 kg/ha and 32.93 kg/ha. The percentages of total water applied from total water use for T 100 were 51.11% and 61.72%, while 14.83% and 17.85% were recorded for T 25 for 2006/07 and 2007/08 cropping seasons, respectively.

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Crop water productivity defines the relationship between crop produced and the amount of water involved in producing the crop. It is a useful indicator for quantifying the impact of irrigation scheduling decisions with regard to water management. This paper presents CWP quantified from field experimental data. The field experiments were conducted for three years in a tropical region of south Western Nigeria to determine the crop water productivity (CWP) and consumptive use of plantain (musa sp) cv. Agbagba. There were four treatments and four replicates based on the level of water application. CWP were computed in terms of crop water use, water applied, and economic returns. Results showed that crop water consumed varied significantly (P<0.05) among treatments. Estimated water consumed ranged from 900 mm to 1700 mm from planting to harvest depending on the irrigation water regime. Crop Water Productivity (CWP) in terms of water consumed varied from 0.91-1.37 kgm-3 for 2006/2007 and 0.91-1.41 kgm-3 in the 2007/2008 seasons respectively while CWP in terms of water applied varied from 2.82-3.98 kgm-3 and 2.89-4.04 kgm-3 in the first and second seasons respectively. The amount of irrigation water applied at the different growth stages of the crop and the growth stage response to moisture stress influenced the status of CWP. The findings indicated that plantain crops were very sensitive to lack of soil water during the total growing season.