Effect of humic acid, compost and biofertilization on fruiting of superior seedless grapevines

الملخص EN

Superior grapevines fertilized with compost, bi-ofertilizers namely (bacillus megatherium, bacillus curculanse and azotoacter chroococcum), humic acid and two slow release fertilizers namely ( rock phosphate and feldspar ) as a partial replacement of mineral n fertilizers during 2013 and 2014 sea-sons.

using all substitutes of mineral n fertilizers was favourable than using mineral n alone in en-hancing all growth characters, total chlorophylls, nutrients, yield and berries characteristics.

both nitrite and nitrate in the juice were greatly declined in all n management treatments that included the application of all n sources.

the best results with regards to yield and berries characteristics of su-perior seedless grapevines were recorded on vines that received 60g n, 60g p and 120g k/ vine/ year ( mineral sources) plus compost ii ( 40% cat-tle manure + 60% rice straw ) at 16 kg./ vine+ the three biofertilizers namely bacillus megatheium, bacillus circulanse and azotobacter chroococcum + humic acid each at 10ml./ vine/ year.