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ISHS Acta Horticulturae 1299: XXX International Horticultural Congress IHC2018: VII International Symposium on Tropical and Subtropical Fruits, Avocado, II International Symposium on Jackfruit and Other Moraceae and II International Symposium on Date Palm

Optimising foliar nitrogen uptake of mango: effect of adjuvant, leaf position and time of potassium nitrate spray

Authors:   C.A. Asis, T. Alexander, A. Sarkhosh, M. Umar, C. McConchie
Keywords:   flowering, foliar spray, leaf nitrogen content, Mangifera indica, shade effect
DOI:   10.17660/ActaHortic.2020.1299.40
Foliar application of potassium nitrate (KNO3) is widely used in promoting flowering of mango trees, but the spray formulation varies greatly. We determined the effect of adjuvant, position of leaves and time of KNO3 spray application on the leaf nitrogen (N) content of mango 'Kensington Pride' to identify optimum conditions for N uptake from foliar KNO3. The treatments were spraying to run off 3% KNO3 with 0, 100, 250 and 500 mL Li-700 100 L‑1 solution on tagged mango leaves from the east (sunny side) and west (shaded portion) of trees in the morning (8:00 am) or night (8:00 pm) time. Each treatment combination was replicated five times and treated leaves were collected at 4, 12, 24, and 48 h after spraying (HAS), rinsed and analyzed for total N content. Results showed that total N contents were comparable in mango leaves across rates of adjuvant, time of application and location of the leaves at 4 and 12 HAS but varied significantly at 24, and 48 HAS. Leaf N content was higher in leaves that were sprayed with adjuvant than those without adjuvant and when the spray was applied in the evening. Total N content was also higher in leaves from the shaded part of the tree than those exposed to sunlight. The results indicate that addition of adjuvant and spray application in the evening assist N uptake of mango leaves following foliar application of KNO3.

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