| The influence of N fertilizer application ratio at different growth stages on grain yields of Liaochun No.10,a variety of spring wheat grown widely in Liaoning Province,was studied under dry-land conditions.The results showed that N application at seeding stage had important effect on grain yield increase and the yield potential was restricted under no fertilizer,too little fertilizer or too much fertilizer.On the basis of proper N fertilizer application at seeding stage,additional applications of N fertilizer at jointing and anthesis stages were able to maintain high LAI and chlorophyll content in leaves at late growing stage,thus enhancing photosynthetic capacity,and promoting dry matter accumulation and transferring of photosynthetic products to kernels. |