Interrelations among Crop Load, Fruit Quality, Shoot Growth, and Leaf Mineral Nutrients in Dense-Planting 'Fuji'/M.26/Seedling Apple Trees with High Productivity

摘要

Dense-planting 'Fuji' apple trees with high productivity every year were sampled to investigate interrelations among yield, shoot growth, leaf mineral nutrient contents, and fruit quality Higher yield resulted in lower soluble solids, higher fruit firmness, and higher chlorophyll content in fruit skin, but no effect on anthocyanin content. Shoot growth positively affected fruit weight and fruit firmness, and negatively fiuit soluble solids and fruit skin anthocyanin content. Leaf N content in late July showed a highly negative correlation with fruit soluble solids, but a highly positive one with fruit firmness. Leaf K had a highly positive correlation with fruit firmness and a negative one with fiuit soluble solids and fiuit skin anthocyanin. Leaf Ca correlated negatively with fiuit skin anthocyanin content. Leaf Mg had a negative correlation with fiuit weight and fiuit soluble solids, but a positive one with fiuit firmness. Leaf B had positive correlations with fiuit firmness and with anthocyaninand chlorophyll of fiuit skin, and negative correlations with fiuit weight and soluble solids. However, leaf P and Mn had no correlations with fiuit characteristics. Leaf N, the most important factors on shoot growth and fiuit quality, showed higher correlation with the parameters analyzed in late June than in late July.