Contents of Flavor Components in Newhall Navel Oranges (Citrus sinensis) Harvested from Eleven Production Areas of China Studies on the Optimum Parameters for Mineral Nutrition in Newhall Navel Orange Leaves Influence of magnesium deficiency and excess on chlorophyll fluorescence characteristics of Newhall navel orange leaves Research on the Fruit Quality of Newhall Navel Orange of Hubei Province Influence of magnesium deficiency on chlorophyll fluorescence characteristic in leaves of Newhall navel orange Studies on the Optimum Parameters for Mineral Nutrition in Newhall Navel Orange Leaves The relationship between leaf nutrients and fruit quality of navel orange in southern Jiangxi province of China Effects of nitrogen forms and ratios on photosynthetic characteristics of Newhall navel orange in calcareous yellow soils