The influence of threshing, cleaning and processing operations on seed quality in two varieties of soybean was studied with an objective to identify the best post-harvest operation to maintain seed viability and vigour. The two varieties viz. Basara and JS 335 were subjected to five different post-harvest operations and two sieve sizes of 3.75 and 4.00 mm. The mechanical damage (%), seed recovery (%), physical purity (%), germination (%), seedling vigour Index II (SVI II), field emergence, electrical conductivity, amino acids and total soluble sugars in seed leachates of processed seed were determined. Among the two varieties Basara recorded lowest mechanical damage and higher germination and field emergence compared to JS 335. The highest seed quality with lowest mechanical damage was reported in seed threshed and cleaned manually. Electrical conductivity showed a non-significant variation in all the treatments while amino acids and total soluble sugars in seed leachates were lowest in Basara. The character association studies revealed a positive association of germination and field emergence and negative association of germination and mechanical damage, amino acids and total soluble sugars in seed leachates.

An experiment on seed reserve utilization using seven rice genotypes was conducted at the Department of Seed Science and Technology, PJTSAU, Rajendranagar, Hyderabad in Factorial Completely Randomised Design with three replications during the year 2021. Seed reserve utilization and its associated traits viz., the weight of utilized seed reserve (WUSR), seedling dry weight (SLDW), remnant seed dry weight (RSDW), seed reserve utilization efficiency (SRUE), and seed reserve depletion percentage (SRDP) varied significantly among the genotypes, days to emergence and their interaction. While initial seed dry weight (ISDW) showed significance among genotypes only. About, the interaction between genotypes and days to emergence, significantly high ISDW (23.93 mg/seed), RSDW (530 mg) and SRUE (29.8) and significantly low WUSR (2.10 mg/seed) and SRDP (8.97 %) were recorded in AUS 276 on 6th day, while significantly high WUSR and SLDW were recorded in Dular (11.76 mg/seed) and Moroberekan (206.33 mg) on 14th day, respectively. Significantly low ISDW (9.30 mg/seed) and SLDW (49.67 mg) on the 6th day, significantly low RSDW (78.33 mg) and SRUE (14.8), and significantly high SRDP (66.63 %) on the 14th day was recorded in RNR 15048. The results explain that WUSR, SLDW, and SRDP increased significantly from the 6th day to 14th day for all the genotypes indicating the depletion of seed reserves for the growth and development of seedlings, and among the characters studied, WUSR is the most important for conversion into seedling tissue than seed reserve utilization efficiency.