不同能态土壤水对冬小麦矿质养分积累,运转和分配的影响

Effect of Different Potential Soil Water on Accumulation,Translocation and Distribution of Mineral Nutrients of Winter Wheat

In the trial the author obtained the following results:Soil wat-er of different potential deeply affected the accumulation,translocation anddistribution of N,P and K of wheat.SWS(S)was closely related to the am-ounts(A)of N,P and K accumulated,resp.,in a nonlinear relationship,i.e.A=a+b/S(a,b being constants).Treated with 0.3bar and 0.5bar SWS,the wheat plant translocated and distributed the nutrients regularly withmore N,P and K accumulated.About 70% of N and P concentrated in thegrain.During grain-filling stage certain amounts of N and P from soil,andK at 0.3bar SWS were still assimilated.In the treatment of SWS>0.5bar,the growth and development of wheat were markedly obstructed,nutrientsdistributed in disorder with less N,P and K accumulated and no net uptakebut more losses of N,P and K during grain filling.SWS>1.0bar,.most ofthe nutrients existed in vegetative organs at repening.