Effect of shading signal on growth and photosynthetic characteristics of soybean seedlings Effects of shading and light recovery on soybean morphology and photosynthetic characteristics in soybean-maize intercropping system Effect of planting patterns on crop yield, nutrients uptake and interspecific competition in maize-soybean relay strip intercropping system Effects of cropping patterns and fertilization on rhizosphere soil phosphorus availability of maize/soybean relay intercropping system Effects of transgenic BADH soybean on nitrogen transformation in saline-alkaline soil