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Organic nitrogen fertilization minimizes requirement of inorganic fertilizers and improves growth and yield attributes of superior grapevines

M. Muhammed,M. F. Qayyum,Fahad S. Alotaibi,Saif Alharbi

Published 2023 in Journal of plant nutrition

ABSTRACT

Abstract Purpose: Nitrogen (N) fertilization is the essential nutrient element that limits crop yields before any other element. However, excessive use of N fertilization often leads to economic loss and quality deterioration of the yield. Materials: In the present study, superior grapevines were fertilized with chemical N fertilizer, chicken manure, or biofertilizer (Nitrobeine) over three seasons (2018, 2019, and 2020) to quantify N usage from different sources. Results: The current study’s findings show that N in the mineral form at 60% to 80%, organic and biofertilizers at 20% to 40% was very effective in improving all growth characteristics and yield when compared to using nitrogen completely in mineral form or reducing the percentages of mineral to 40%. Reducing the ratios of mineral nitrogen from 100% to 40% and at the same time increasing the proportions of organic and biofertilizers from 0.0 to 60% caused a gradual increase in the improved berry quality, raising in TSS, % reducing sugars, TSS/acid ratio and decreasing in total % acidity in berries. Conclusions: To improve the yield of Superior grapevines quantitatively and qualitatively with minimum chemical N, it is advisable to supply the vines with the suitable nitrogen (72.0 g N/vine/season) as mineral N (ammonium nitrate) at 60%, organic (chicken manure) at 20% and bio-fertilizers (nitrobeine) at 20%. Thus, replacing 40% of mineral fertilizers with organic and bio-fertilizers can be recommended for producing organic berries.

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