Determination of the best onion irrigation interval var(Texas early grano) with surface method
2011
Karami, Yaghobali | Yektankhodaei, Maryam | Ghoreyshi, Maryam | Noori Hosaini, Mojtaba
A 3_year experiment was carried out on onion cv. Texas Early Grano at Minab Agricultural Research Station to study the effect of irrigation interval using surface irrigation system and planting method on the bulb yield, qualitative properties and water use efficiency. The study employed a completely randomized block design(CRBD) as a split plot experiment having 4 irrigation interval as main plot (based on 30,50, 70 and 90 mm evaporation class-A pan; Epan) in combination with 2 planting methods (transplant and direct seed sowing) as subplot in three replications. Irrigation interval had no significant effect on yield, TSS, single bulb weight and roundness but significantly affected the water use efficiency (WUE). The maximum water use efficiency of 2.95 kg m-3 was obtained with irrigation treatment based on 90 mm Epan. The planting method showed significant effect on WUE, TSS and bulb roundness, while yield and single bulb weight did not vary between two planting methods. Using transplants yielded in the maximum water use efficiency of 2.77 kg m-3 and TSS of 5.9%. Compared with transplant method, the highest bulb roundness of 0.925 was observed when seeds were directly sown. There was a significant interaction between irrigation interval and planting method on WUE (p0.01) and TSS (p0.05). In direct seed sowing, the highest TSS of 6.22% was achieved when irrigation was applied at 50 mm and the highest WUE of 3.27 kg m-3 was achieved in transplant system when irrigation was applied at 90 mm Epan .
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