EFFECT OF NPK AND ORGANIC FERTILIZERS ON THE GROWTH AND YIELD OF BLACKGRAM IN OLD HIMALAYAN PIEDMONT PLAIN SOIL (AEZ-1) OF BANGLADESH

Abstract

A field experiment was carried out at the Soil Science Research field in Hajee Mohammad Danesh Science and Technology University, Dinajpur during the kharif season of 2022. This study was performed to examine the effects of organic and inorganic fertilizers on the growth and yield of blackgram. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. There were six treatment combinations viz. T1 = Control (No fertilizer use), T2 = 100% Recommended Dose (RD) of NPK, T3 = 100% RD of Cowdung (CD) + Poultry manure (PM) + Vermicompost (VC), T4 = 75% (CD + PM + VC) + 25% RD of NPK, T5 = 50% (CD + PM + VC) + 50% RD of NPK, T6 = 25% (CD + PM + VC) + 75% RD of NPK, respectively. The yield contributing characteristics like plant height, number of leaves plant-1, number of branch plant-1, number of pods plant-1, pod length, thousand seed weight, seed yield ha-1 and biological yield ha-1 were significantly influenced due to different treatments. In the case of plant height, leaf numbers plant-1, branches plant-1, the highest results were found at different treatments at 15, 30 and 45 DAS but at 60 DAS the highest results were noticed at T5 treatment. The lowest results were obtained in T1 treatment. A significant increase in the NPK contents as well as their uptake due to the combined application of organic manures and NPK was observed. The results of soil indicated that the application of NPK fertilizer and organic manure positively influenced the total N, available P, exchangeable K, and available S contents in soils. Therefore, this study reveals that the application of 50% RD of NPK fertilizers along with 50% (CD + PM + VC) might be an efficient practice for achieving economical blackgram production.