Canopy Development,Light Interception and Grain Yield in High Yielding Wheat Varieties in Beijing District Oxygation Enhances Growth, Gas Exchange and Salt Tolerance of Vegetable Soybean and Cotton in a Saline Vertisol Light interception and utilization of maize-capsicum strip relay intercrop Studies on Relationship among Character of Canopy Light Interception and Yield in Maize Populations(Zea mays L.) Leaf Movement and Sunlight Interception of Tilia amurensis Seedlings Study on Light Interception, Photosynthesis and Respiration in High-yielding Peanut Canopies