Using of grafted plants provides a stability and tolerance against biotic and abiotic stress factors in tomato cultivation and increases yield and quality that depend on vigour of rootstocks. This study was conducted to determine the effects of different rootstocks on yield, quality and nutrient contents of grafted tomatoes in soilless culture. In the experiment, cv. Yankı F 1 and cv. Esin Fı were used as plant material. Groundforce, Spirit F 1 , ES30501, ES30502, ES30503, body, Beaufort, Titron, 8411, R801 and K-8 were used as a rootstock. Nongrafted and selfgrafted plants were used as control treatments. Marketable yield was obtained increasing rate by 13.85 to 32.73% according to nongrafted and selfgrafted plants. Vitamin C, water soluble dry matter and titratable acidity were not affected significantly by rootstocks. Similarly, use of grafted plants did not affect the nutrient content of tomato fruits significantly.

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Humic acid can transform mineral nutrients into available forms for the plants. High lime content, low organic matter content, high pH, low moisture content and insufficient profile characteristics all higher plant phosphorus uptakes and consequently regress plant growth and development. The present research was conducted to investigate the effects of humic acid treatments (H.A.) (0, 60, 120 mg/kg) on phosphorus use efficiency (PUE) (0, 50, 100 mg/kg P) of grape and pole tomato (Lycopersicum esculentum L.) varieties. Pot experiments were carried out in a glasshouse in randomized block design with three replications. As basic fertilization, 250 mg/kg N and 200 mg/kg K was applied to the pots. Plants were harvested when they had their 5 th raceme. Dry matter yields, N, P and K contents were analyzed. Dry matter yields increased with humic acid and phosphorus treatments. Phosphorus contents also increased with increasing phosphorus doses. While humic acid and phosphorus treatments affected the potassium contents, Ca contents increased through only the humic acid application.

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