| In order to find out the best amount and application way of phosphorus fertilizer for dryland wheat,a field test was carried out in Wenxi,Shanxi province. Two application depths (20，40 cm) and three phosphorus amounts (P2O5 75,112.5,150 kg·hm-2) were conducted. The effects of phosphate fertilizer on soil moisture and dry matter accumulation and translocation of dryland wheat were analyzed. The results showed that increasing the amount of phosphorus improved 100 cm soil moisture of dryland wheat before anthesis,and the effect of 40 cm depth application was more significant than that of 20 cm depth. With the increase of the amount of phosphorus,the weight of plant dry matter were increased at different growth stages and significantly different under the condition of 40 cm depth. Comparing with 20 cm depth,under high phosphorus with 40 cm depth,dry weight of leaf,stem and sheath before anthesis was increased. However,the dry weight of stem and sheath was decreased significantly at maturity stage,and the dry weight of grain and its ratio to plant were increased at this stage. With the increase of the amount of phosphorus,contribution rate of dry matter accumulation amount to grain after anthesis was improved significantly and the effect of 40 cm depth was more obvious than that of 20 cm depth. In addition,for dryland wheat under the different depths of phosphorus application,the relationship between soil moisture from wintering to booting stage and dry matter accumulation amount after anthesis was closely,especially for soil moisture of booting stage. In conclusion,40 cm depth application of 150 kg·hm-2 phosphorus fertilizer for dryland wheat is beneficial to improve the soil moisture in 100 cm until booting stage. It is benefit to promote the translocation of dry matter from stem and sheath to grains,and improve the accumulation of dry matter and its contribution to grain after anthesis,which finally improved grain yield. |
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