Efficiency of slow release fertilizers on reducing the rates of mineral-N fertilizers in Flame seedless vineyards

Document Type : Original papers

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1 Department of Pomology, Faculty of Agriculture, Assiut University

2 Department of Horticulture (Pomology), Faculty of Agriculture and Natural Resources, Aswan University

Abstract

This study was conducted during 2021, 2022 and 2023 seasons on 8 years old Flame Seedless vineyard. The vines were grown in Luxor Governorate, Egypt. The perleka a slow-release fertilizer, was used as a totally or partial replacement of the fast mineral N release fertilizer. The results revealed that using the recommended dose of nitrogen (RDN) via 25% as a mineral source and 50% slow release or 60 to 80% slow-release significantly increased the wood pruning weight and leaf area aswellas their of total chlorophylls, N, P and K contents compared to use the RDN only as a fast mineral N fertilizer. Using 80% of RDN via slow release significantly stimulated these traits more than other used treatments. No significant differences were seen due to fertilize by either 80 or 60% slow release aswellas 25% mineral plus 50% slow-release fertilizer. Moreover, the N fertilization with a combination of 25% mineral and 50% slow release or 60-80% slow release significantly increased the yield and fruit quality compared to use the RDN only as a fast mineral release source. The promotion in the yield and fruit quality was associated with increasing the level of the slow release from 50 to 80% of RDN. Raising slow release used from 50 to 80% of RDN failed show any significant increase in fruiting traits. It is evident that fertilized with either 60% slow-release or 25% mineral plus 50% slow release is important for the grapevines production. It improves the yield and fruit quality of grapevines.

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