We studied the influence of walnut shading on growth, development, photosynthesis and yield of different wheat varieties under walnut wheat intercropping model. The results showed that plant weight, grains per spike, grains weight per spike, 1000 grains weight, harvest index, yield, the photosynthesis of flag leaf, inverted second leaf and inverted third leaf of wheat under the crown of walnut trees were lower than that far away from the crown, meanwhile, different varieties had the same trends. However, the photosynthesis, yield and its components of Yannong 22 were higher than that of DH155, Mianmai 48,Mianmai 37 and Xingdong 20.As a result, in walnut wheat intercropping system, photosynthesis, florets and total spikelets were the important assessment indexes for wheat varieties selection. |