Physiological activity and material production in processing tomato under continuous cropping Diurnal Variations of Carbohydrate Contents and Activities of Related Enzymes in Leaves in Response to Defruiting in Peach Trees Diurnal Variations of Carbohydrate Contents and Activities of Related Enzymes in Leaves in Response to Defruiting in Peach Trees QTL Mapping of Sink-Source Related Traits Using Two Sets of Reciprocal Introgression Lines in Rice Study on photosynthetic property of Cucurbita maxima Effects of potassium on plant growth, potassium cycle and distribution in different maize genotypes Effects of Fruit Thinning on Fruit Sugar Accumulation and Leaf Photosynthetic Characteristics of Pear Effects of Fruit Thinning on Fruit Sugar Accumulation and Leaf Photosynthetic Characteristics of Pear