Effects of straw mulching and planting green manure on water use and nutrients uptake of winter wheat on dryland

With bare fallow in summer as control,field experiments were carried out to study effects of wheat straw mulching,green manure planting and their mixture under no-tillage on grain yield,water use efficiency and uptake of nitrogen(N),phosphorus(P) and potassium(K) of winter wheat in dryland areas.The obtained results showed that straw mulching and green manure planting had no significant effect on the winter wheat yield and biomass.Compared with the control,straw mulching increased water consumption of wheat by 10 mm while planting green manure decreased it by 11 mm.However,straw mulching and planting green manure had no significant effect on water use efficiency.Additionally,planting green manure and straw mulching plus planting green manure in summer fallow period significantly declined nutrient uptake by winter wheat with N by 6.0% and 6.6%,P uptake by 5.9% and 6.2%,and K uptake by 7.9% and 7.9%,respectively.Consequently,one-year straw mulching and green manure planting had no obvious effect on winter wheat yield,however,straw mulching increased water consumption of winter wheat while planting green manure decreased it.Planting green manure and straw mulching plus planting green manure treatments decreased the nutrient uptake of N,P and K of winter wheat.