Elevated Potassium Enhances Leaf Productivity and Suppresses Foliar Diseases of Mulberry Plant

F. Ahmed, R. Sultana, M. J. Alam, O. Ahmed and M. T. Iqbal

Journal of Agricultural Studies, 2020, vol. 8, issue 3, 90-105

Abstract: Potassium (K) may enhance productivity and suppresses foliar diseases of mulberry plant. Existing optimum dose of K for mulberry cultivation need to be updated for suppress foliar disease and improve mulberry plant productivity. This study was conducted to renew the optimum dose of K for mulberry cultivation with respect to the ages of mulberry plant. Therefore, a field study was conducted in split plot design with three replications at Bangladesh Sericulture Research and Training Institute (BSTRI), Rajshahi, Bangladesh to find out the effect of elevated K and ages of plant on growth, leaf yield, leaf quality, nutrient uptake and infestation of foliar diseases of mulberry plant. Six levels of K (0, 30, 60, 90, 120 and 150 kg/ha/yr) along with BSRTI recommended basal doses of nitrogen (N) and phosphorus (P) were applied on two age group of plant viz- (0-5) years and (6-10) years. Result showed that the highest leaf yield 47.10 mt ha -1 year -1 for 6-10 year’s plant at the treatment of T5 (N300P150K150 kg ha -1 year -1). This indicatedleaf yield 175.44% greater over the control but 22.69% higher than the 0-5 year’s plant. Similarly, the maximum leaf quality viz- moisture, reducing sugar, total mineral, total sugar, soluble carbohydrate and crude protein were obtained in (6-10) year’s plant for the same treatments which were 13.82%, 23.47%, 29.96%, 20.57%, 39.58% and 30.69% respectively greater over the control. Furthermore, the average incidence percentages of foliar diseases like leaf spot, tukra and powdery mildew were reduced by 42.34%, 58.02% and 82.96% respectively in (6-10) years plant due to the elevated doses of K like as 150 kg, 90 kg and 60 kg/ha/yr respectively with BSRTI recommended doses of N and P over the control. This findings indicated that the use of 150 kg potassium ha -1 year -1 had better performance on the leaf yield and quality of mulberry plant. Therefore, the application of 150 kg potassium ha -1 year -1 with BSRTI recommended dose of N and P both for (0-5) and (6-10) year’s ages of mulberry plant cultivation is the best options for higher leaf yield and quality whereas 150 kg, 90 kg and 60 kg potassium ha -1 year -1 respectively are better for controlling of leaf spot, tukra and powdery mildew diseases.

Date: 2020
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