Pot and field experiments of maize(Zea mays L.)under drip irrigation were conducted to evaluate the effects of phosphorus fertigation and lateral depths on the distribution of Olsen-P in soil and growth and yield of maize in 2016 and 2017, respectively. Three lateral depths at 0, 15, and 30 cm beneath the soil surface and two phosphate fertilizer application methods(single basal application and split fertigations)were tested in both years. Another treatment with no phosphate fertilizer applied was considered in the field experiments as control. The phosphorus fertigation could improve the efficiency of phosphate fertilizer while the strong phosphorus adsorption was also observed. The phospho-rus fertigation significantly improved the growth and yield of maize and the phosphate fertilizer application methods imposed significant effects on the yield of maize at a significance level of α=0.1 for both the pot and field experiments. The treatments with lateral depth at 15 cm generally obtained higher yields than the treatments with lateral depths at 0 cm. However, poor phosphorus availability might be found for the crops while the drip laterals were buried at 30 cm and thus limit the growth of crops. The phosphorus fertigation and subsurface drip irrigation are recommended to improve the use efficiency of phosphate fertilizer while a large lateral depth should be used with cautious.
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