Alternative Natural Chelating Means for Iron as Compared With EDDHA on LeConte Pear Trees Budded on Calleryana Rootstoc

Document Type : Original Article

Authors

1 Agriculture research center

2 Department of Deciduous Fruits, Horticulture Research Institute centre, Agricultural Research Centre, Cairo, Egypt

3 Department of Deciduous Fruits, Horticulture Research Institute centre, Agricultural Research Centre, Cairo, Egypt.

Abstract

To overcome the problem of iron deficiency in the rootstock of Pyrus calleryana, due to its susceptibility to chlorosis caused by lime, to improve Le-Conte pear trees grafted on this rootstock, some natural materials were used to chelate iron and artificial chelated iron (EDDHA 6%). These materials were 1- Ascorbic acid (3.8g/tree) + ferrous (6.2 g/tree) 2- Humic acid (2.7g/tree) + ferrous (7.3g/tree) 3- Amino acids (3.6 g/tree) + ferrous (6.4g) 4- EDDHA (10 g/ tree) 5- Control. These treatments were added as ground additives under the trees in three doses at the beginning and middle of the growing season and a month before harvest. The most important results were: Ground application of ascorbic acid + 
ferrous, followed by Humic acid + ferrous iron treatment, led to a significant increase in the quantity of the crop as a result of an increase in the fruit set of the trees and an increase in the weight and size of the fruits and the dimensions of the fruits and increased the iron available to trees and increased the zinc and copper content of the leaves for ascorbic acid + ferrous. The best treatments for increasing hardness, TSS, and reducing the acidity of the fruits were as a result of the ground treatments with amino acids + ferrous iron as a result of the increased potassium, Fe and Mn content of the leaves.The humic acid + ferrous treatment showed an increase in the vegetative growth rate as a result of an increase in 
the nitrogen content of the leaves. The positive effects of these materials + ferrous are due to the increase in iron available in the soil compared to the control.

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