Effect of P Fertilizer and Planting Density on Yield of Special Maize in Semiarid Area

[Objective] The study was to give a technique support for the plant of special maize in semiarid area.[Method] With Gaoyou 115 as tested material,the influence of different planting density and P2O5 application rate on the yield of special maize was investigated.[Result] Increasing P application rate and planting density all increased the bald of maize.The bald in the treatment of increasing P application rate was bigger than that of increasing density.The economic traits in the combination of 55 500 plant/hm2(density) +112.52 kg/hm2 (P fertilizer) was best,with uniform ear length,1.5 cm bald,641 grains per ear and 20.5 g of 100-grain weight.The yield in the combination of 66 750 plant/hm2+187.5 kg/hm2 was highest(7 851.1 kg/hm2).The yield in combinations of 55 500 plant/hm +2 62.5 kg/hm2 and 55 500 plant/hm2 +187.5 kg/hm2 was lowest,being 5 697.3 and 5 766.8 kg/hm2 resp.When the density was 66 750 plant/hm2,the 3 P fertilizer levels had a little influence on yield.When the density was 59 250 plant/hm2,the negative effect of increasing P application rate on yield was significant.[Conclusion] The optimum density and P application rate for special maize was 59 250-6 6750 plant/hm2 and 112.5-187.5 kg/hm2 resp.in terraced fields of semiarid area.