Boron plays an important role in plant nutrition and plant growth. Boron in low concentrations is essential for plants but produces a toxic effect if present in high amounts. Boron toxicity is particularly common in arid and semi-arid climates and in areas where thermal water resources are used. High boron levels in soils can cause toxicity in plants and prevent plant growth. Negative effects of toxicity can be reduced by some plant nutrition treatments. The aim of this study was to investigate the effects of plant nutrition treatments on the alleviation of B toxicity, and the effects of increasing P doses on tomato plant at toxic levels of B were observed in greenhouse conditions. The study was conducted under greenhouse conditions in the autumn growing period, in Antalya-Turkey, and using 4 different levels of B (0, 5, 10 and 20 mg kg-1 with H3BO3) and 3 levels of P (25, 50, 100 mg kg-1 with mono ammonium phosphate). Tomato plants (Lycopersicon esculen­tum Mill., cv. ‘Tayfun F1’) were cultivated in plastic pots (6 kg pot–1 soil) for a period of 10 weeks to determine some growth parameters and the nutrient content. As a result of the research, it was determined that the growth of tomato plant was negatively affected by B toxicity and boron toxicity symptoms occurred in the plants. B and P applications increased the plant nutrient content, and P2 (50 mg kg-1 P) treatment decreased the B content in the plant. Increased P treatments caused an increase in nutrient content, thereby ensuring plant development and the negative effects of toxicity were reduced owing to the effect of dilution.

26.4.2021