Influence of plant growth promotion rhizosphere-bacteria 'PGPR' enrichment and some alternative nitrogen organic sources on tomato.

摘要

Two year trials were carried out on two tomato open field cultivars, in new reclaimed sandy soil, to investigate the effect of enrichment by plant growth promotion rhizosphere-bacteria "PGPR", Bacillus subtilis, strain GB03, and organic alternation sources of nitrogen. Eight combination of 100% mineral nitrogen Source "M", 100% Organic nitrogen source "O", 50% M+50% O and 25% M+75% O, with and without PGPR treatments were carried out on GS12 and 'Alisa' tomato cultivars. Plant nutrient status, vegetative growth, productivity and fruit quality parameters were investigated. The results proved that, PGPR treatment improved plant nutrients uptake efficiency, growth, productivity and fruit quality. The best combination for tomato fertilization was 50% M+50% O+PGPR, followed by 25% M+75% O+PGPB, 100% M+PGPR and then 100% O+PGPR treatment. Accordingly it could be a good recommendation to alternate 50-75% of mineral nitrogen fertilization by organic source with supporting of Bacillus subtilis enrichment, in order to reduce the harmful residues of mineral nitrogen in ground water, soil and the produced tomato fruits.