Effect of tree leaf N status and N application time on yield and fruit N partitioning of mango
Nitrogen (N) is an essential nutrient in mango (Mangifera indica L.), but research on N fertilizer uptake and partitioning in mango is lacking. The objective of this study was to determine the influence of timing of N fertilizer application on yield and N allocation in leaves and fruits on mango trees ('Kensington Pride') with variable leaf N dry matter concentrations. Nitrogen was applied (200 g tree-1) using 15N-labelled urea (2.1 atom% excess 15N) either at postharvest or pre-flowering on trees with low (1.0%N) and high (1.2%N) leaf N status. Results showed that %N derived from fertilizer (%Ndff) was greater in high-leaf-N trees when N was applied during postharvest, but did not differ significantly when applied at pre-flowering. Leaf N status of mango trees and timing of N application had no marked influence on total number of fruits, total fruit weight, or weight of fruit. However, yield efficiency (total fruit yield divided by trunk cross-sectional area) in trees with high leaf N status was higher than those trees with low leaf N status, yet did not differ for timing of N application. Total N uptake was higher in the flesh of the fruit from low-N trees than in high-leaf-N trees. The %Ndff did not differ in the skin, flesh or seed of mango. However, %Ndff was significantly higher in fruits from trees with low leaf N status and when N was applied at pre-flowering. Results indicate that N allocation in the leaves and mango fruit differ depending on leaf N status of trees and timing of N application.
Hamilton, D., Martin, C., Bennet, M., Hearnden, M. and Asis, C.A. (2017). Effect of tree leaf N status and N application time on yield and fruit N partitioning of mango. Acta Hortic. 1183, 161-166
fertilizer 15N uptake, Mangifera indica, mango nutrition, N levels, timing of N fertilizer