EFFECTS OF MICROELEMENT-CONTAINING PESTICIDES ON NUTRIENT CONCENTRATIONS OF MANGO LEAVES

Z.H. Shu, T.F. Sheen, S.L. Lin, K.C. Lee
The study was designed to study the effect of foliar sprays of microelement-containing pesticides or pure chemicals on the micro-nutrient concentrations in mango leaves. Mango trees had not received any pesticides for at least two years were sprayed one week after full bloom with either pesticides or pure chemicals both containing one or two of the micro-nutrients, Cu, Fe, Mn and Zn. Three replicates and ten treatments were initiated. Leaves were harvested 5 times, at before spraying, 2, 8, 16 and 240 days after spraying. Mango leaves responded to pure chemicals and pesticides sprays by increasing the concentrations of the corresponding micro-elements. Except for Cu, all the other three micro-elements kept increasing or maintaining the high concentrations until the last picking date. Copper concentration had its peak on the 16th day after receiving the supplemental Cu foliarly. However, leaf Cu concentration decreased when harvested 240 days after spraying. Fe and Mn concentrations increased as leaf age increased. The acquired high micro-element concentrations was not passed onto the matured leaves emerged after the treatments except for the MnSO4, ZnSO4 and Cu+Fe+Mn+Zn mixture treatments.
Shu, Z.H., Sheen, T.F., Lin, S.L. and Lee, K.C. (1992). EFFECTS OF MICROELEMENT-CONTAINING PESTICIDES ON NUTRIENT CONCENTRATIONS OF MANGO LEAVES. Acta Hortic. 321, 553-560
DOI: 10.17660/ActaHortic.1992.321.63
https://doi.org/10.17660/ActaHortic.1992.321.63

Acta Horticulturae