Abd El- Hameed H. M.and A. M. Ahmed( 2010). Improving soil fertility and productivity of flame seedless grapevines grown under sandy soil by application of humic acidMinia J. of Agric. Res. Vol. (30) No. 1 pp 31 -50 , 2010
Abstract: Flame seedless grapevines grown under sandy soil were fertilized with the suitable amount of N ( 80 g / vine) through 25 to 100% inorganic and / or humic acid at 2.5 to 40 cm2/ vine as a trial for improving sandy soil fertility, vine nutritional status and productivity of the vines. The study also aimed to partially reduce the amount of inorganic N by using humic acid for decreasing pollution of the berries with nitrite and nitrate.
Results showed that reducing the amount of inorganic N from 100 to 50 % of the suitable N and increasing the amount of humic acid from 2.5 to 40 cm2/ vine were accompanied with improvement in soil fertility and growth , N, P and K content , yield, physical and chemical characters of the grapes. Reducing the amount of inorganic N from 50 to 25% of the suitable rate of N even with the application of humic acid had inferior effects on the studied parameters. Combined application of N in inorganic form and humic acid was favourable than using inorganic N alone in this respect.
The best results with regard to soil fertility, and Flame seedless grapevines nutritional status and productivity of grown under sandy soil were obtained with supplying the vines with 80 g N/ vine as 50% inorganic plus humic acid at 20 cm2/ vine. This treatment greatly reduced nitrite and nitrate contents in the juice of the berries.
Keywords: ()
