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- W2542752462 startingPage "481D" @default.
- W2542752462 abstract "Bench-grafted Fuji/M26 trees were fertigated with seven nitrogen concentrations (0, 2.5, 5.0, 7.5, 10, 15, and 20 m m ) by using a modified Hoagland solution from 30 June to 1 Sept. In Mid-October, plants in each N treatment were divided into three groups. One group was destructively sampled to determine background tree N status before foliar urea application. The second group was painted with 3% 15 N-urea solution twice at weekly interval on both sides of all leaves while the third group was left as controls. All the fallen leaves from both the 15 N-treated and control trees were collected during the leaf senescence process and the trees were harvested after natural leaf fall. Nitrogen fertigation resulted in a wide range of tree N status in the fall. The percentage of whole tree N partitioned into the foliage in the fall increased linearly with increasing leaf N content up to 2.2 g·m –2 , reaching a plateau of 50% to 55% with further rise in leaf N. 15 N uptake and mobilization per unit leaf area and the percentage of 15 N mobilized from leaves decreased with increasing leaf N content. Of the 15 N mobilized back to the tree, the percentage of 15 N partitioned into the root system decreased with increasing tree N status. Foliar 15 N-urea application reduced the mobilization of existing N in the leaves regardless of leaf N status. More 15 N was mobilized on a leaf area basis than that from existing N in the leaves with the low N trees showing the largest difference. On a whole-tree basis, the increase in the amount of reserve N caused by foliar urea treatment was similar. We conclude that low N trees are more effective in utilizing N from foliar urea than high N trees in the fall." @default.
- W2542752462 created "2016-11-04" @default.
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- W2542752462 date "2000-06-01" @default.
- W2542752462 modified "2023-10-16" @default.
- W2542752462 title "504 Urea Uptake and Nitrogen Mobilization by Apple Leaves in Relation to Tree Nitrogen Status in the Fall" @default.
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- W2542752462 doi "https://doi.org/10.21273/hortsci.35.3.481d" @default.
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