硅肥和播种方式对胡麻田土壤磷素形态特征的影响OA

In order to explore the cultivation and management techniques to promote the transformation of phosphorus morphology in flax soil and improve its effectiveness,the effects of silicon fertilizer application rate(0,75,150 kg·hm-2)and sowing method(conventional strip sowing and wide uniform sowing,marked as R0 and R1,respectively)on soil total phosphorus and available phosphorus content and soil inorganic phosphorus components at maturity stage were studied through field two-factor splitting experiments.The results showed that the amount of silicon application and the sowing method significantly affected the soil phosphorus content.Silicon application significantly reduced soil pH at seedling,flowering and maturity stages,and increased soil phosphorus content.Among them,the soil pH value was the highest under high silicon(Si2)at seedling stage,while the highest was achieved without silicon(Si0)at mature stage.The total phosphorus content in the soil reached the highest level at the budding stage under the silicon application rate(Si1)of 75 kg·hm-2,and gradually decreased after the full flowering stage.Compared with the conventional strip sowing technology,the soil available phosphorus content in(R1)flax increased significantly by 14.97%-18.39%at each growth stage,while the total inorganic phosphorus content decreased significantly.The interaction between silicon fertilizer and sowing method significantly improved the soil phosphorus status,among which Si1R1 treatment significantly increased the available phosphorus content at seedling,bud stage,and maturity stage,which were significantly increased by 25.35%-51.66%,compared with Si0R0 and Si2R0 treatments,and the closed stored phosphorus content under Si1R1 treatmeut was higher than that of other treatments.Correlation analysis showed that available phosphorus was significantly positively correlated with closed stored phosphorus(P<0.01)and negatively correlated with iron-bound phosphorus(P<0.05).In conclusion,75 kg·hm-2 silicon fertilizer combined with wide uniform sowing technology could effectively reduce soil pH,activate soil calcium-bound phosphorus and closed stored phosphorus,and take into account the effective supply and long-term stability of soil phosphorus,which provided a theoretical basis for the efficient utilization of phosphorus fertilizer in flax production in arid areas of northwest China.