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Boron is one of the important essential elements in the production of green tea leaves, which affects the yield. So far, no documented report has been published on the amount and method of using boron fertilizers and their effect on the quantitative and qualitative performance of green tea leaves in tea gardens, so this project aims to investigate the application of different concentrations of boron fertilizers on the yield and quality of green tea leaves. Tea and choosing the best spraying level was implemented. This research was carried out in four different tea gardens in rainfed conditions, in Lahijan, Rodsar, Foman and Ramsar cities in the form of a complete randomized block experimental design with three treatments including: 1-T1: Fertilization based on the recommendations of soil fertility tests, 2 T2: Fertilization based on soil test + spraying 0.5% boric acid solution twice during the growing season, T3-3: Fertilizing based on soil test + spraying 1% boric acid solution twice during the growing season (early May, early August) and Three replicates were performed. At the time of harvest, the amount of green leaves produced in each plot was harvested and the yield per hectare was calculated. The concentration of nitrogen, phosphorus, potassium and boron in leaves was measured to evaluate the nutritional status. The obtained data were statistically analyzed using SAS software and mean comparisons were performed using Tukey's test. The results showed the positive effect of 0.5% boric acid concentration in three areas on green tea leaf yield. Although boron foliar spraying did not have a significant effect on the concentration of nutrients and shoot density. In general, according to the condition of tea garden soils, which are prone to boron deficiency, and the lack of recommendation and use of it in the general fertilization program of tea gardens, it is recommended to add 0.5% boric acid foliar spraying in the fertilizer program of leading tea gardens.
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