A field experiment of spring wheat was conducted from March to July in 2015 to find out the optimum irrigation amount and drip tape distance, the effect of three drip tape distances (D1: 60 cm, D2: 90 cm and D3: 120 cm) and three irrigation amount (I1: 35 mm, I2: 45 mm and I3: 55 mm) on spring wheat yield and water use efficiency were studied. The results showed that D1I2 treatment had the highest yield of 8964 kg/hm2. When the drip tape distance was 60 cm or 90 cm, the yield increased significantly when the irrigation amount increased from 35 to 45 mm, while the yield decreased by 9.5% and 2.2% when the irrigation amount was 55 mm. When the irrigation amount was 35 or 45 mm, the yield of D1 treatment was significantly higher than that of D3 treatment; but when the irrigation amount increased to 55mm, the yield of the three drip tape distance treatments had no obvious difference. Water use efficiency ranged from 1.57 to 2.11 kg/m3 and the highest one appeared in D2I2 treatment. Taking yield, irrigation amount, water use efficiency and input of drip tapes into consideration, treatment D2I2 was recommended as the best combination of drip tape distance and irrigation amount in this area.
Key words
spring wheat; drip tape distance; irrigation amount; yield; water use efficiency
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