Abstract: Influence of different bed width on the interspecific relationship in relay cropping of wheat and corn was studied based on the field experiments. The results showed that increase of bed width from 1.2m to 2.4m could take marginal advantage of wheat and reduce marginal disadvantage of corn, so the crop yield of double cropping increased. And increased of the bed width was also helpful for mechanization of farm work under the relay cropping.

Key words: tomato, saline-alkali stress, spermidine, nitrogen metabolism, mineral element.