Optimizing role of biochemical fertilization on growth, yield and fruit quality of thompson seedless grapevine [electronic resource].

Includes references.

This experiment was carried out during two successive seasons (2008 and 2009) in private farm at Egypt – Alex. Desert Road to study the effect of minimizing the use of mineral fertilization alone as 100 % recommended mineral fertilizers to only 75% or 50% with combination by biofertilization i.e., (Azotobacter ssp., Azospirillum ssp. and Bacillus ssp., [(PDB) phosphate dissolves bacteria] on vegetative growth, yield and fruit quality of Thompson seedless grapevine under drip irrigation system. Results indicated that, all treatments had no significant effect of all vegetative growth parameters (number of leaves per shoot, leaf area, total chlorophyll and shoot length) as compared with (control) 100 % of recommended mineral fertilization. T5 (75%) of recommended mineral fertilization with 25% mixed biofertiliers (Azotobacter, Azospirillum and phosphate dissolves bacteria (PDB) gave the highest values of yield as number of cluster per vine and cluster weight (g) in both seasons. Fruit quality was improved in terms of berry length, diameter, and weight, weight of 100 berries and juice volume /100 berries (m 3) and also TSS %, total sugars % and TSS % : Acid ratio while total acidity percentage were significantly reduced through using all treatments. On the other hand, T5 as 75% mineral fertilizers with 25 % mixed inoculation biofertilizers (Azotobacter, Azospirillum and Bacillus ssp., (PDB) gave the high values of leaf N % and K % content compared with other treatments and compared with T1(control) 100 % recommended mineral fertilizers without biofertilizers while P leaf content was no significantly affected by treatments. Generally, fertilizing Thompson seedless grapevine with 75% recommended mineral fertilization + 25% mixed biofertiliers (Azotobacter ssp.,Azospirillum ssp. and Bacillus ssp., (PDB) phosphate dissolves bacteria gave the highest values and greatly improved in growth, yield and fruit quality.

Summary in Arabic.

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