EFFECT OF DIFFERENT LEVELS OF POTASSIUM ON NODULATION, YIELD AND NUTRIENT CONTENT OF MUNGBEAN (BARIMung-6)

Abstract

An experiment was conducted at the research field of the department of Soil Science of Shere-Bangla

Agricultural University, Dhaka, during the period from April, 2017 to September, 2017 to study the effect of Potassium on nodulation, yield and nutrient content of mungbean (BARIMung-6). There were 7 treatments formulated with different potassium levels (0, 20 kg K ha -1 , 30 kg K ha -1 , 40 kg K ha -1 , 50 kg K ha ii -1 , 60 kg K ha -1 , 70 kg K ha ) which were arranged in RCB design having 3 replicators. Blanket dose of other nutrients was N 15 P 20 S 10 Zn 2 B . The unit plot size was 3m×2m. Highest number of branches (3.66) was recorded under T 1.5 5 (50 kg/ha) treatment and the lowest number of branches (2.66) at T

(control). The highest plant height (49.83 cm), the highest number of pod plant (12.33), highest pod length (9.27 cm), highest number of nodule per plant (11.00), highest number of seed per pod (11.67), the highest thousand grain weight (50.83 g), highest seed yield (1.60 t ha -1 ), highest stover yield (1.97 t/ha), highest biological yield (3.57 t ha -1 ) was recorded under T 6 treatment. The lowest plant height (42 cm), the lowest number of pod plant (9.33), lowest pod length (8.50 cm), lowest number of nodule per plant (5.00), lowest number of seed per pod (11.33), the lowest thousand grain weight (48 g), lowest seed yield (0.89 t ha ), lowest stover yield (1.42 t/ha), lowest biological yield (2.31 t ha -1 ) was recorded under T treatment. Highest harvest index (60.40%) was recorded under T treatment. The effect of potassium on soil pH, organic matter and total nitrogen % was non-significant. The highest available phosphorus (22.05 ppm) was recorded from T 7 5 while the lowest available phosphorus (12.47 ppm) was recorded from T treatment. The highest exchangeable potassium (0.22) was recorded in T 6 1 treatment while the lowest exchangeable potassium (0.18) was recorded in T

treatment. Highest nitrogen content in mungbean seed (3.58%) was recorded under T

treatment which was statistically similar with T treatment and lowest nitrogen content in mungbean seed was recorded under T 1 6 . Highest potassium content (1.52) by seed was recorded under T (60 kg/ha) treatment and lowest potassium content (0.81%) by plants was recorded under T 6 treatment. Nitrogen and Phosphorus content by stover of mungbean plant were non-significant. Highest potassium content (1.70) in mungbean stover was recorded under T 6 1 and lowest potassium content (1.08) by plants was recorded under T treatment.