Abstract
BackgroundAt present, agricultural production management techniques focus on greater commitment to environmental sustainability. As such, this study was carried out during two successive seasons (2018 and 2019) to investigate the impact of two natural bio-stimulant substances: humic acid (H) and milagro (M) on vegetative growth and nutritional status of Nonpareil almond young trees grown in Experimental Research Station of National Research Centre, Nubaria, El Behera governorate, Egypt. Three-year-old uniform trees were treated at the beginning of growth season by soil application of humic acid (H) and foliar spray of milagro (M) bio-stimulant. There were ten treatments as follows: control (untreated seedlings),10 g humic acid plus 10 ml/l milagro, 20 g humic acid plus 10 ml/l milagro, 30 g humic acid plus 10 ml/l milagro,10 g humic acid plus 20 ml/l milagro, 20 g humic acid plus 20 ml/l milagro, 30 g humic acid plus 20 ml/l milagro, 10 g humic acid plus 30 ml/l milagro, 20 g humic acid plus 30 ml/l milagro, and 30 g humic acid plus 30 ml/l milagro.ResultsThe results showed that different treatments improved the vegetative growth of seedlings, stem length, diameter, number of branches and leaves, leaf area, leaf fresh and dry weight, and specific leaf dry weight as well as leaf chlorophylls and minerals content comparing with untreated young trees.ConclusionsSoil application of 30 g humic acid along with 30 ml/l milagro per young tree as foliar spray was the promising treatment as a new fertilization technique that is non-chemical, low-cost, and environmentally safe for improving growth and nutritional status of Nonpareil almond young trees under Nubaria conditions.
Highlights
At present, agricultural production management techniques focus on greater commitment to environmental sustainability
The treatment with 30 g humic acid plus 30 ml/l milagro gave the highest values of stem length (110.30 and 112.6 cm), diameter (13.00 and 4.18 mm), number of branches (42.00 and 44.55/young trees), and number of leaves (672.00 and 675.20/young trees ) in the first and second season, respectively, while the lowest values of stem length (65.33 and 67.56 cm), diameter (6.50 and 8.09 mm), number of branches (4.66 and 6.58/ young trees), and number of leaves (44.00 and 47.75/ young trees) were recorded in the control during the both seasons, respectively
Humic acid 30 g plus milagro 30 ml/l gave the highest values of leaf fresh weight
Summary
Agricultural production management techniques focus on greater commitment to environmental sustainability. This study was carried out during two successive seasons (2018 and 2019) to investigate the impact of two natural bio-stimulant substances: humic acid (H) and milagro (M) on vegetative growth and nutritional status of Nonpareil almond young trees grown in Experimental Research Station of National Research Centre, Nubaria, El Behera governorate, Egypt. Three-year-old uniform trees were treated at the beginning of growth season by soil application of humic acid (H) and foliar spray of milagro (M) bio-stimulant. Nonsaturated fatty acid is important in maintaining low cholesterol levels in the blood and significant amount of micronutrients (Aslanta et al 2001). In Egypt, commercial almond production is still limited in spite of suitable environmental conditions for growth and fruiting (Abou Rayya et al 2009; Kasim et al 2009)
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