Effect of Straw Returning with Phosphate Fertilizer on Soil Nutrient and Phosphate Utilization Rate in Dryland Wheat
Luohan 22 was used as the experimental material,and a split-plot experimental design was employed.The main plots were divided into two treatments:no straw return(S0)and straw return(S1),while the sub-plots received P0～P4 treament(phosphorus application of 0,75.0,112.5,150.0,187.5 kg/hm2,respectively).Soil physicochemical indexes and phosphorus utilization efficiency of wheat at different growth stages were measured.The effects of straw returning and phosphorus application on soil nutrients and phosphorus uptake and utilization of wheat were analyzed.The results showed that:(1)The content of total nitrogen,total phosphorus,total potassium,alkali-nitrogen,available phosphorus and available potassium in the soil generally decreased gradually as the wheat growth stage progressed,with the highest levels during the jointing period and the lowest during the maturity period.(2)Under the same phosphorus application level,the S1 treatment was generally higher than the S0 treatment,with increases in total nitrogen,total phosphorus,total potassium,alkali-nitrogen,available phosphorus,and available potassium of 1.99%,8.08%,1.74%,4.74%,7.38%,and 5.73%respectively.(3)With the same phosphorus application level,straw return increased the agronomic phosphorus use efficiency,phosphorus recovery rate,phosphorus partial factor productivity,and phosphorus absorption efficiency compared to no straw return,with increases of 12.09%,82.68%,6.11%,and 16.72%respectively.(4)Under the same straw return treatment,agronomic phosphorus use efficiency and apparent recovery rate increased first and then decreased with the increase of phosphorus application level,reaching a maximum at the P2 treatment level(112.5 kg/hm2).Phosphorus partial factor productivity and absorption efficiency decreased with the increase of phosphorus application level,and the interaction between straw return and phosphorus fertilization significantly affected agronomic phosphorus use efficiency,apparent recovery rate and absorption efficiency.
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