Differences of Plant-Type Characteristics between Rice Cultivars with High and Low Levels in Yield and Nitrogen Use Efficiency Effects of Shading in Maize/Soybean Relay-Cropping System on the Photosynthetic Characteristics and Yield of Soybean Some Plant-type Parameters Measurement Based on Image Technology inTomato Some Plant-type Parameters Measurement Based on Image Technology inTomato Plant-type Characteristics in Populations with Different Yield of Yongyou 12