Improving irrigation water use efficiency for Potato crop production under sandy soil conditions
2009
Khalifa, E.M.A.
The aim of irrigation management during the potato growing season should be to maintain the soil water content in the 0-60 cm depth between the Full point and the Refill point to minimize excess soil water content, which could leach below the root zone, and avoid soil water stress effects on the crop. Greenhouse experiments with pieces of rice straw were carried out during the growing season 2006/2007 (October to January) in an Arid Land Research Center, Tottori University, Japan. The present study included four irrigation intervals (every day, every two days, every three days and every four days) and five different mixed ratio between rice straw pieces and sandy soil (0, 10, 20, 30 and 40 % by volume). The objective of the present research was increase sandy soil holding capacity and improves irrigation water use efficiency for potato crop production. The important results that obtained from the present work were as follows: The maximum value of water consumptive use was 580 mm/season that obtained with 0.3 and 0.4 straw-soil ratio for four days irrigation interval. Irrigation drainage water increased by about of 62.30, 197.39 and 283.37% for 2, 3 and 4 days irrigation intervals, respectively comparing with every day irrigation interval. Irrigation every day gave the highest values of water application efficiency because increase irrigation intervals tended to increase deep percolations (water drainage). The average values of tuber yield were 7.93, 9.56, 8.36 and 6.30 Mg/fed. for irrigation intervals 1, 2, 3 and 4 days, respectively. The results indicated that, increasing rice straw-soil ratio tended to increase irrigation water use efficiency due to decrease irrigation water drainage by increasing rice straw- sandy soil ratio.
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