Response of superior grapevines to fertilization by enriched humic acid and chicken manure

Abstract EN

This investigation was carried out during 2006 and 2007 seasons on 7-years-old Superior grapevines.

The vines were grown in a sandy loam soil, spaced at 2 X 3 meters apart and irrigated by the drip irrigation system with well water, cane-pruned and trellised by the "Y" shape system.

This study aimed to study the effect of fertilization by some combinations of enriched humic acid and chicken manure on yield, berries quality, vegetative growth and leaf petiole mineral contents.

The following treatments were carried out : 1- Control (90 % Mineral fertilizer + 10 % Chicken manure).2- 100 % Humic acid (HA) + 0 % Chicken manure(Ch.M).3- 75 % HA + 25 % Ch.M.4- 50 % HA + 50 % Ch.M.5- 25 % HA + 75 % Ch.M.6- 0 % HA + 100 % Ch.M.

The obtained results indicated a gradual increment in bud burst percentage from mid of February until second week of March in all treatments.

Third and fourth treatments gave the highest values of bud burst percentage, yield/vine, cluster number / vine, cluster weight, cluster length and cluster width.

The third one had the highest records of fruitful buds percentage.

Moreover, the same treatment recorded the highest values of the studied physical characteristics as well as soluble solids content of berries, vegetative parameters and annual pruning wood weight / vine.

The lowest nitrate and nitrite berries juice contents were obtained by the sixth treatment.

Also, the highest petiole leaf mineral contents were noticed by the third and fourth treatments.