Determination of consumptive water amount in potato
1383
Hossanzadeh, Amir Aslan | Hossanzadeh Debakhshan, Ahmad | Ahmadi Adli, Rasool
The experiment was carried out in five replications using randomized completely blocks design with four treatments, treatments were the irrigation intervals based on 14, 28, 41 and 55 mm. evaporation of class A pan(I 1 , I 2 , I 3 and I 4 respectively). Every year before of planting for determining of chemical specifications of soil, one composed soil sample was provided at the depth of 0-30 cm. The consumption fertilizer was in the form of N 90 P 180 K 120 . The soil physical specifications determind with sampling of existing layers in depth of 0-100 cm. Irrigation was carried out by piping and amount of application water meteric counter. The first irrigation was uniformly carried out for wetting 80 cm. of soil depth. The amount of water in the next irrigations was determined by sampling of soil. The results show that I 2 treatment is advisable. In this treatment mean yield was 43006 kg/ha, and consumptive water use was 4560 m 3 /ha. I 2 treatment had maximum WUE, and it irrigated 9 times. Farshi et al. (1376) have estimated that the consumptive water use of potato is equal to 5261 m 3 /ha in Ardabil region. In spite of 20% decrease in yield with increasing irrigation interval (decreasing irrigation frequency from 9 to 6), we can save 4.36% in amount of applied water and rach to 4361 m 3 /ha.
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