Under the condition of natural precipitation,the drip irrigation water supply was used to simulate the natural precipitation,and the effects of different precipitation and P application rate on the yield,P uptake and accumulation and the utilization ratio of phosphate fertilizer in black soil were studied.The experiments were set up in water and phosphorus two factors.The results showed that,the increase of precipitation and the amount of P fertilizer increased the accumulation of dry matter and the formation of maize yield.Effects of phosphorus application amount on the yield of maize was more significant than precipitation,proper precipitation and phosphorus application can increase the yield of maize;the treatment W3(natural precipitation+200 mm),P3 (220 kg/ha) which yield reached 13 914 kg/ha was the highest among all treatments,the utilization of phosphorus fertilizer decreased with the increase of phosphorus application and increased with the increase of precipitation.Under the same precipitation condition,the phosphorus accumulation in maize plants increased and then decreased with the increase of P application amount,under the condition of proper P application,proper precipitation can significantly increase the P accumulation of maize.In summary,W3(natural precipitation+200 mm),P2(110 kg/ha) treatment was the optimal treatment,namely in the year of precipitation was 508 mm,the maize yield reached 13119 kg/ha,P fertilizer use efficiency also reached the highest,up to 19.7％.
MaizePrecipitationPhosphorus application amountYieldBiomassPhosphorus absorption and accumulationP utilization
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