EFFECT OF SEED INVIGORATION TREATMENTS ON FIELD PERFORMANCE AND STORABILITY OF AGED SEED OF GREENGRAM [Vigna radiata (L.) Wilczek]
Acharya N.G. Ranga Agricultural University
The present investigation entitled “Effect of seed invigoration treatments on field performance and storability of aged seed of greengram [Vigna radiata (L.) Wilczek]” was carried out at Agricultural Research Station (ARS), Jangamaheswarapuram, Guntur (field studies) and Department of Seed Science and Technology, Advanced Post Graduate Centre, Lam, Guntur (storability studies) during 2016-17. The seed of greengram cv. LGG-460 were invigorated by the hydration treatments viz., CaCl2 (2%), hydropriming, moringa leaf extract (5%), KNO3 (1.5%), hydroprimed and dry dressing with thiram (0.25%). Seed were also invigorated by dry dressing with bleaching powder (2g/kg of seed) and red chilli powder (1g/kg of seed). The invigorated seed along with the untreated seed (control) (aged and fresh seed) were used for both storability and field studies. Among the invigoration treatments hydroprimed and dry dressed with thiram exhibited the highest germination (93.7%) and field emergence (92.0%). Seed treated with red chilli powder and bleaching powder exhibited more plant height. Leaf area, number of leaves, number of branches were found to be superior in seed treated with bleaching powder, red chilli powder and hydro primed and dry dressed with thiram. However, days to 50% flowering was not influenced by the invigoration treatments. Treating of aged seed with bleaching powder, red chilli powder and hydroprimed and dry dressed with thiram increased the number of pods per plant, number of seed per plant, seed yield per plant and 100 seed weight. Shelling percent and harvest index were also high in hydroprimed and dry dressed with thiram treatment. Even during storage, among all the invigoration treatments, hydroprimed and dry dressed with thiram treatment performed well with respect to the seed quality parameters like germination, seedling length, seedling dry weight and seedling vigour index over the control. Though the hydroprimed and dry dressed with thiram treatment performed well in storage in first four months, the dry dressing treatment viz., bleaching powder and red chilli powder treatments gave good results compared to hydration treatments in maintaining germination percentage after six month of storage, where the germination percentage was on par with fresh seed. Correlation studies exhibited positive and significant association with seed yield for all parameters except germination and plant height. The present study proved that seed invigoration with bleaching powder @ 2 g/kg of seed, red chilli powder @ 1 g/ kg of seed and hydroprimed and dry dresssed with thiram @ 0.25% of seed may be suggested for improvement of field performance and storability of greengram seed.