Effect of planting time, irrigation method and plant pattern on yield and yield components of potato Varieties in Jiroft, Iran

To find the most suitable planting time، irrigation method، plant pattern and their effect on tuber yield of potato varieties، strip split plot experiment was done in a complete randomized block design with three replicates in Jiroft، Iran in 2008-2009 planting season. Treatments were irrigation method at vertical factor in two level sprinkle and dripping irrigation، planting time an main: horizon in two levels night and day irrigation plant pattern an lateral horizon factor in three level planting row intervals 75cm and plant interval 20cm، planting row intervals 70cm and planting interval 21. 5cm and planting row intervals 65cm and plant interval 23cm and finally potato varieties were lateral factor in two levels، Vergo and Sante. Results showed that irrigation method had significant effect on tuber yield and water was efficiency at 0. 01 and on tuber number and tuber mean weight at 0. 05 also on plant pattern had significant effect. Tuber yield، biomass weight and water use efficiency at 0. 01 Variety effect on all elements was significant at 0. 01. Treatment of drip irrigation method had the most tuber yield with 50014 Kg/h which it was more than sprinkle irrigation method with 22037 Kg/h. Day irrigation had more yield in comparison with high irrigation. The treatment of sante variety with trickle and day irrigation and plant pattern of 65×23cm، had the most yield with 5547 kg/h and it is recommended for this region.