اثرات مصرف بهينه چند عنصر مهم غذايي بر عملكرد و كيفيت چاي

Effects of any important nutrients on the yield and quality of tea

Effects of nitrogen, potassium and micronutrient fertilizers application on yield and quality of tea were studied during 1997-1998-growing season at Fasha-leme Foman Research center. Using a factorial split-plot with three factors in three replications carried out the experiment. Nitrogen and potassium fertilizers were both distributed in two levels in a factorial form in mainplots and micronutrients, because of having many replications and better study in subplots were distributed in four levels. This experiment included ten plucking. The total yield was obtained from the sum of ten harvests and was evaluated the tea quality. The percentage of tannin and water extract was measured twice and caffeine percentage once. Micronutrients application, specially treatment of magnesium sulphate+Zinc sulphate indicated significant effect (P=0.01) on the increase of yield. Urea application had significant effect (P=0.05) on tannin and water extract percentage. Interaction of nitrogen, potassium and micronutrient effects were significant on caffeine percentage (p=0.01). In this case urea with potassium chloride without micronutrients had the best effect.