MITIGATION OF SALT STRESS THROUGH GYPSUM IN MUNGBEAN (BARI MUNG-8)

Abstract

A pot experiment was conducted at the Agronomy Pocket House, Department of Agronomy, Hajee Mohammad Danesh Science and Technology University, Dinajpur from March, 2022 to May, 2022 to determine the alleviation of salt stress through Gypsum in Mungbean. The experiment was single factorials which comprised of salinity level 75mM and four levels of gypsums 15 mM, 30 mM, 45 mM and 60 mM. The experiment was laid out in Completely Randomized Design (CRD) with three replications comprised six treatments viz., i) T1 (0 mM NaCl + 0 mM gypsum), ii) T2 (75 mM NaCl + 0 mM gypsum), iii) T3 (75 mM NaCl + 15 mM gypsum), iv) T4 (75 mM NaCl + 30 mM gypsum), v) T5 (75 mM NaCl + 45 mM gypsum), vi) T6 (75 mM NaCl + 60 mM gypsum). In the present investigation seeds of BARI Mung-8 was used. Plants were grown under saline and non-saline conditions. Twenty seeds were sown in each pot and later thinned to 8 plants per pot. The data which were collected during the experiment are plant height (cm), number of leavesplant-1,number of branchesplant-1, fresh and dry weight of plant parts (leaf, stem and root) (g), chlorophyll content (chl-a, chl-b and total chl a+b), plant water status (RWC, WSD, WRC, WUC) of plant parts (leaf), pod length (cm), number of pods plant-1, number of grain pod-1, 100 seed weight (g), seed yield plant-1 (g), stover yield plant-1 (g), biological yield plant-1 (g), harvest index (%), and nutritional properties (Na, K, Ca, N and protein) of seeds . The recorded data were analyzed where mean difference was compared by DMRT. Gypsum doses were applied at two intervals. Intercultural operations like thinning, weeding etc. were done when necessary. The result revealed that different growth parameters, yield and yield contributing characters and bio-chemical parameters of mungbean variety BARI Mung-8 were significantly influenced by salinity and different levels of gypsum. In saline condition, T5 (75 mM NaCl + 45 mM gypsum) showed the highest plant height, fresh and dry weight (leaves, stems and roots), better water status and chlorophyll content, maximum number of pods plant-1(15.00), highest pod length (4.73 cm),highest number of grains pod-1(6.33), highest value of 100 grains (4.60 gm), highest grain yield (1.17g plant-1), highest stover yield (1.31g plant-1), highest biological yield (2.48 g plant-1), highest harvest index (41.17%). These results indicated that application of gypsum could alleviate the adverse effects of salinity and increase the tolerance of mungbean to salinity. On the other hand, T2 treatment (75 mM NaCl without gypsum) showed the lowest value for all parameters. Therefore, Mungbean (BARI Mung-8) can be successfully cultivated under moderate salt stress (7.5 dS/m or 75 mM NaCl stress) with the addition of 75 mM gypsum.