Effect Of Tillage In Fallow Period And Increasing Phosphorus Fertilizers On Soil Water And N,P Use Efficiencies In Dryland Wheat

In order to explore soil water moisture conservation technology in fallow period and matching phosphorus application of dryland wheat, field test was carried out in Wenxi, Shanxi province under the conditions of tillage in fallow period and different phosphorus application levels of 0 kg/hm2 (P0),75 kg/hm2 (P75)?150 kg/hm2 (P150)?225 kg/hm2 (P225)?300 kg/hm2 (P3oo)?375 kg/hm2 (P375) to study the effect of tillage in fallow period and regulation effect of phosphorus fertilizer on soil water, soil nutrients, root, population quality, plant N, P use efficiencies, yield and qulities in rain-fed, WUE of dryland wheat. The results showed that:After tillage in fallow period, soil water storage at the depth of 0-300 cm at sowing stage was significantly improved, and it was improved 16.36 mm. The soil water storage at the depth of 0-300 cm of winter stage to booting stage was significantly increased, and meanwhile increasing the amount of phosphorus, the soil water storage at the depth of 0-200 cm at winter stage declined first and then ascended, and the P150 was the highest, the depth of 140-180 cm at elongation stage and the depth of 100-140 cm at booting stage declined first and then ascended, and the P225 was the highest.After tillage in fallow period, soil organic matter content at the depth of 0-40 cm at sowing stage was significantly improved, soil Available P content at the depth of 0-100 cm at sowing stage was improved, and meanwhile increasing the amount of phosphorus, the 0-40 cm soil organic matter content at maturity and 0-100 cm soil Available P content at anthesis and maturity declined first and then ascended, and the P150 was the especially highest.After tillage in fallow period, the root growth characteristics at the depth of 0-80 cm at different growth stages was improved, and the root growth characteristics at the depth of 0-80 cm in elongation stage was improved, and meanwhile increasing the amount of phosphorus, the root growth characteristics at the depth of 0-80 cm at different growth stages declined first and then ascended, and the P150 was the especially highest, the Po at turning green stage was the lowest, and the root growth characteristics at the depth of 0-80 cm in elongation stage declined first and then ascended, and the P150 was the highest.After tillage in fallow period, the tillering number, dry matter, plant height, leaf areas, spike length and bearing spikelet number at maturity were improved, the sterility spikelet number was close, and meanwhile increasing the amount of phosphorus, the tillering number, dry matter, plant height, leaf areas, spike length and bearing spikelet number at maturity declined first and then ascended, and the P150 was the especially highest, the sterility spikelet number on Pisowas the lowest.After tillage in fallow period, the ear Number, the oretical yield and yield were improved, and meanwhile increasing the amount of phosphorus, the 1000-grain weight, filling rate, the oretical yield, yield and WUE declined first and then ascended, and the P150 was the especially highest, the ear Number declined first and then ascended, and the P150 was highest.After tillage in fallow period, the phosphorus accumulate amount in plant at different growth stages, phosphorus accumulate amount in various organs at maturity, P recovery, P agronomic efficiency were improved, and meanwhile increasing the amount of phosphorus, the phosphorus accumulate amount in plant at different growth stages, P recovery, P agronomic efficiency declined first and then ascended, and the P150 was the especially highest, the phosphorus accumulate amount in various organs at maturity, and the P150 was highest, and the grain on P150 was especially.After tillage in fallow period, nitrogen uptake rate of seeding stage to winter stage and anthesis to maturity was improved, nitrogen accumulate amount in plant at different growth stages, NAAA, NTBA, nitrogen accumulate amount in grain at maturity, N uptake efficiency and N productive Efficiency were significantly improved, and meanwhile increasing the amount of phosphorus, nitrogen uptake rate of seeding stage to booting stage and anthesis to maturity declined first and then ascended, and the P150 was highest, nitrogen uptake rate of seeding stage to winter stage and anthesis to maturity especially highest, the nitrogen accumulate amount in plant at different growth stages, NAAA, NTBA, N uptake efficiency and N productive Efficiency declined first and then ascended, and the P150 was the especially highest, nitrogen accumulate amount in grain at maturity declined first and then ascended, the Piso was highest.After tillage in fallow period, grain protein and its compontent contents, protein yield and soluble sugar content, surose content, starch content in grain was improved, and meanwhile increasing the amount of phosphorus, grain protein and its compontent contents, protein yield and soluble sugar content, surose content, starch content in grain declined first and then ascended, the P150 was the especially highest.In all, tillage in fallow period is beneficial to protect leisure period precipitation, improve aswp, the water still significant effect to the booting stage, to improve soil nutrient content, promote the dry land wheat root growth, optimizing plant yield, agronomic traits, build reasonable group, promote accumulation of nitrogen and phosphorus absorption by plant, is conducive to plant flowers after nitrogen before operation and nitrogen accumulation, to improve protein content of grain protein and its components, production, to improve the grain soluble sugar, sucrose, starch content, and with p 150 kg/hm2 effect significantly, in the end, the leisure commune with p 150 kg/hm2 can obtain higher yield, quality and water use efficiency.