This investigation was carried out during two seasons i.e. 2016 and 2017 on Superior Seedless grapes cultivar grown at the Experimental Orchard, Faculty of Agriculture, Assiut University, Egypt. Ten combined treatments of GA 3 , urea, roselle and active dry yeast spraying at various stage of berry development were evaluated. The experimental vines were arranged in a complete randomized design. From the results of this investigation, it could be concluded that spraying with GA 3 seven times, once at pre-bloom (5 ppm), thrice at full-bloom (5 and 10 ppm) and other thrice when the berry at (6 mm) pea stage (30ppm). In addition , combined spraying GA 3 four times once at pre-bloom and thrice at full-bloom plus 1.5% active dry yeast when the berry at pea stage, as well as roselle at0.2% three times to obtain heavy and less compact cluster and hasten the ripening with fairly good Superior Seedless berries quality. In addition, it could be used urea and yeast as well as roselle extract instead of GA 3 in grape production to overcome the adverse GA 3 effects.
The present investigation was carried out during two successive seasons 2019 and 2020 on Flame seedless grapes cultivar grown in sandy soil at private farm, Naga Hamady, Qena Governorate, Egypt. Eight treatments of mineral N, humic acid, organic and biofertilization applied to study the effect of them on vegetative growth, soil nutrient status, and fruiting of Flame seedless grapevines. The experimental vines were arranged in a complete randomized design with eight treatments and three replications two vine per each. The obtained results could be summarized as follow: Using the recommended dose of nitrogen (RDN) via 25 to 50% mineral plus 25 to 50% Humic acid (HA) or compost and bio-mix significantly increased, leaf area, pruning wood weight, and leaf total chlorophyll as well as leaf nutrient composition compared to use RDN via mineral N fertilizer alone. All combined fertilization treatments significantly increased the yield and improved the cluster and berry traits compared to use RDN via mineral source only. The results of this investigation indicated that, most trace element and soil physical and chemical properties were increased with increasing the level of organic, bio fertilization and humic acid in studied soil. Also, it could be concluded that fertilized vines with 25 to 50% of nitrogen requirements plus HA or compost and bio-mix improved the vegetative growth and nutritional status, as well as, yield, cluster attributes and berry quality of Flame seedless grapevines under this experiment circumstances.
This study was run out through 2019 and 2020 seasons at private orchard at Elwakff, Quena Governorate, Egypt to assess the effects of potassium different source fertilizer on the fruiting of Hayani date palm. The experiments were arranged in a completely random design with three replicates one palm each. Results showed that yield/ palm and bunch weight were significantly increased by treated with feldspar, bio (potassium solubilizing bacteria KSB) and potassium citrate. All treatments have a significant increase in the physical and chemical characteristics of the fruits. However, the best results were obtained when using 75% feldspar + 25% bio or 50% feldspar + 50% bio, as well as 1 or 1.5% potassium spraying. No significant differences due to use 75 or 50% feldspar + 25 or 50% bio or potassium citrate 1% or 1.5%. Therefore, from the results of the study, we recommend that treating date palm trees with 50% feldspar + 50% bio or spraying dates with 1% potassium citrate to obtain a high yield with good properties, hence high value marketing.
This study was carried out at the experimental orchard, Faculty of Agriculture, Assiut University, Egypt, to investigate the effect of boron, zinc and silicon foliar spray on growth and fruiting of Balady mandarin trees during 2016 and 2017 seasons.The experiment was arranged in a randomized complete block design with three replications per treatment, one tree each. Boric acid (17% B), zinc sulphate (23% Zn) and potassium silicate (25% Si + 10% K 2 O) were sprayed three times on March, May and August. The obtained results could be summarized as follow:Spraying either boron, zinc or silicon singly or in combination significantly increased the growth traits and the total chlorophyll as well as the total carbohydrates, nitrogen content and C/N ratio of shoots compared to water spraying (control).The maximum values of these traits were recorded on trees that were sprayed with combination of 0.025% boron, 0.050% zinc and 0.10% silicon followed by silicon, zinc and boron spray, boron or zinc as well as zinc or silicon.All treatments significantly increased the fruit retention percentage and yield/tree compared to the untreated one.All foliar application treatments improved the fruit quality in terms of increasing the fruit weight, pulp percentage, total soluble solids, sugar and vitamin C contents and decreasing the total acidity compared to spraying water (control). The best fruit quality was recorded when the trees were sprayed with combination of boron, zinc and silicon.It is evident from the foregoing results that the foliar application of boron, zinc, silicon alone or combination improved the tree nutrient status, yield and fruit quality.As a conclusion it is suggested to use boric acid at 0.050%, zinc sulphate at 0.10% and potassium silicate at 0.2% (as a source of silicon) alone or a combination of boron 0.025, zinc 0.050 and silicon 0.10% three times during growth season for improving the growth and fruiting of Balady mandarin trees.
This study was carried out during 2018 and 2019 seasons for examining humic acid and amino acids effects on the yield and fruit quality of Manfalouty pomegranate trees grown under Assiut region circumstances. The experiment was set up in a complete randomized block design with three replicates, one tree per each. Manfalouty pomegranate trees were treating with humic acid or amino acids three times. Spraying humic acid at (1, 2 and 3 %) or amino acids at (0.5, 1 and 1.5%) was very effective in stimulating all physical and chemical characteristics of the fruits relative to spray with water (control). Humic acid (3%) spraying gave the highest yield followed by amino acids (1.5%). On the other side, all treatments significantly decreased the fruit cracking percentage compared to control. The least fruit cracking was recorded due to amino acids at (0.5%) spraying. All treatments significantly increased fruit weight and fruit dimensions as well as arils percentage and juice contents compared to control. Moreover, humic acid at (1, 2 and 3 %) or amino acids at (0.5, 1 and 1.5%) significantly improved the fruit chemical constituents, compared to control. Spray via any concentration of humic acid or amino acids had no significant differences. It could be concluded that foliar application of either humic acid at 1% or amino acids at 0.5% three times during the fruit growth of manfalouty pomegranate, there application had necessary to get high yield and reduction fruit cracking percentage with best fruit quality.
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