Effects of nitrogen form on nutrient uptake, growth and fruit yield of rabbiteye blueberry [Vaccinium ashei]
1995
Katakura, Y. (Keisen Jogakuen Junior Coll., Isehara, Kanagawa (Japan)) | Yokomizo, H.
The effects of N form on nutrient uptake, growth, fruit yield and fruit quality of 3-year-old "Homebell" rabbiteye blueberry (Vaccinium ashei READE) trees were studied in solution culture for 3 y. With increasing N supply, the growth and fruit yield of the trees supplied with ammonium were increased, whereas those supplied with nitrate were decreases. The root growth supplied with ammonium was also more vigorous than that supplied with nitrate. High nitrate supply resulted in brown roots and marginal leaf chlorosis, which showed small necrotic spots. A high N supply resulted in reduced fruit weight and increased sugar content in both N sources. The juice pH of fruits was higher in ammonium supply than in nitrate supply. Five nutrients (N, P, K. Ca and Mg) were absorbed from early April to late October. N, P and K uptake was higher in early May to early August, whereas Ca and Mg uptake was higher in mid-September to early October. High nitrate supply resulted in reduced N, P, K. Ca and Mg uptake, especially in reduced Ca and Mg rates. Leaf N, P and K contents were increased with supplying these nutrients in both N sources, but with increasing nitrate supply leaf Ca and Mg were decreased. Water absorption was higher in the trees supplied with ammonium than in those supplied with nitrate
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