Physiological activity and material production in processing tomato under continuous cropping 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 QTL Mapping of Sink-Source Related Traits Using Two Sets of Reciprocal Introgression Lines in Rice Study on photosynthetic property of Cucurbita maxima Cytochemical Localization of ATPase and Acid Phosphatase in Minor Veins of the Leaf of Vicia faba During Different Developmental Stages Effects of Fruit Thinning on Fruit Sugar Accumulation and Leaf Photosynthetic Characteristics of Pear Effect of Sink-source Change on Net Photosynthesis and Rela ted PhysiologicalResponse in Peach Trees ( Prunus persica ) 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 EFFECT OF SINK-SOURCE RELATIONSHIPS ON PARTITIONING OF14C PHOTOSYNTHATES IN CHINESE DATE(ZIZYPHUS JUJUBA) Effects of Elevated CO2 on Growth, Carbon Assimilation, Photosynthate Accumulation and Related Enzymes in Rice Leaves during Sink-Source Transition STUDY ON THE RELATIONSHIP AMONG THE DRY MATTER PRODUCTIVITY AND THE POPULATION SINK-SOURCE FEATURE AND YIELD OF DIFFERENT PLANT TYPE MAIZE Population physiological indices on density-tolerance of maize in different plant type