Effect of Humic and Fulvic Acids With Some Nutrients at Diffrenet Time of Application on Yield and Fruits Quality of Anna Apple Trees

Abstract

The present investigation was undertaken during the selected two successive seasons of 2012 and 2013 on 12 years old Anna apple trees (Malus domestica, Borkh) budded on Shobra khan apple rootstocks. The selected trees were planted in a private orchard in Tanta, Gharbia Governorate, in clay soil and spaced at 3 x 4 meters apart. The trees were trained as open-vase form, irrigated by Nile water using surface irrigation (basing irrigation) system. The selected trees received the same horticultural practices and fertilization regime. The experiment was conducted on 60 apple trees Anna cv. in both seasons, ten treatments were carried out, each treatment replicated three times considering each two trees as a replicate using a split plot design , Humic and fulvic acids were added at 4 liter/fed. and mix with calcium nitrate (0.4 %) , zinc sulphate (250 ppm) and borax (20 ppm) as foliar spray at five development stages (at bud burst , fruit set, at the beginning of false coloring , at the end of false coloring and at the beginning of true coloring. Sprayed trees with fulvic acid at 4 liter/fad. and mixture of calcium nitrate (0.4 %) , zinc sulphate (250 ppm) and borax (20 ppm) at bud burst (T6) significantly increased both leaf surface area and shoot length in both seasons. While T7 sprayed trees with fulvic acid at 4 liter/fed. and mix., calcium , zinc and boron after fruit set recorded the highest values of fruit number/tree, fruit weight and fruit volume, soluble solid content, soluble solid content /acid ratio and total sugars and decreased specific gravity in fruits in both seasons. fruit height and diameter were increased with sprayed trees with humic acid at 4 liter/fed and mixture of calcium nitrate (0.4 %) , zinc sulphate (250 ppm) and borax (20ppm) at the beginning of false coloring) during the two seasons of study. The trees sprayed with humic acid at 4 liter/fad. and mixture of calcium nitrate (0.4 %), zinc sulphate (250 ppm) and borax (20 ppm) at beginning of true coloring and the end of false coloring on Apple fruits (T4 and T5) gave significant increase of fruit firmness in both seasons as compared to other tested treatments

Effect of Calcium, Zinc and Boron Treatments on Flowering, Yield and Fruit Quality of Mango Ewais Cultivar

“…The obtained results are in accordance with those of El-Kosary et al (2011) on Keitt and Ewais mango cultivars, they indicated that spraying microelements containing zinc and boron combined with amino and Humic acids improved weight, height, width, size, firmness of Keitt and Ewais mango fruits. In this concern, El-Boray et al, (2015) with Anna apple trees, they found that foliar application of mixture of calcium nitrate , zinc sulphate borax and humic or fulvic acids after fruit set increased the values of fruit height, fruit width, fruit weight and fruit volume.…”

Fulvic acid foliar application: a novel approach enhancing antioxidant capacity and nutritional quality of pistachio (Pistacia vera L.)

“…The indirect impacts contain the factors which participate in providing energy for helpful organisms, influence the water holding capacity, impact the structure of the soil, distribution of various nutrients from minerals, enhance the trace minerals accessibility, and increase soil’s fertility. The changes which occurred in plant metabolism following the uptake of organic microelements, such as fulvic acid are considered a direct effect that include the entrance of these substances to plant cells and results in some biochemical changes in cytoplasmic components and membranes of cells [ 30 ].…”

The Effect of a Preparation Containing Humic Acids on the Growth, Yield, and Quality of Strawberry Fruits (Fragaria × ananassa (Duchesne ex Weston) Duchesne ex Rozier)

“…The number of fertilisation treatments did not have significant effect on the average weight of strawberries. The authors of other experiments on the use of biostimulants, including humic acids, observed their positive effect on the weight of not only strawberries [45] but also apples [46,47]. However, the experiments conducted by Soldaniband et al [36] did not reveal any significant effect of the biostimulants on the weight of strawberries.…”