Effects of Different Drip-line Layouts and Dripper Discharges on Soil Water-nitrogen Distribution and Spring Wheat Yield

In order to find out the suitable drip-line layouts and dripper discharges of spring wheat in northwest arid area，field experiments of wheat under drip irrigation had been conducted at a farm in Minqin county，Gansu province.Drip irrigation experiments had set up two kinds of dripper discharges（2.2 L/h and 3.1 L/h）and three kinds of drip-line layouts（one drip-line for 4，5 and 6 rows of wheat，respectively）.By analyzing soil water-nitrogen distribution，spring wheat water consumption，physiological indicators and yield of different irrigation parameters，the results showed that：horizontal water transport of 3.1 L/h dripper discharge in soil was larger than that of 2.2 L/h，while the vertical water transport was smaller with the same irrigation amount in the loam with the same irrigation amount；when the dripper discharge was the same，the soil water content at 1/2 drip-line spacing decreased with the drip-line spacing increased.After fertilization，the accumulation of nitrate nitrogen in 0-40 cm soil layer was increased with the dripper discharge increased，while that in 40-60 cm soil layer showed different tendency with the dripper discharge increased.Accumulation of nitrate nitrogen beneath dripper increased with the drip-line spacing increased.With the same dripper discharge，total dry mass and yield of the treatment of one drip-line for 6 rows of wheat were significantly lower than that of the treatment of one drip-line for 4 and 5 rows of wheat，but there was no significant difference between treatment of one drip-line for 4 and 5 rows of wheat.With the same drip-line layouts，compared with 2.2 L/h dripper discharge treatment，the 3.1 L/h dripper discharge has the higher total dry mass and yield.Considering the yield，cost and other factors，it was recommended to choose the drip layout figuration that one drip-line for 5 rows of wheat with 3.1 L/h dripper discharge.