Field experiments were conducted for two consecutive years (2009-10 and 2010-11) during Rabi seasons at the research farm of Directorate of Seed Research, Mau to study the effects of polymer seed coating along with insecticide, bio-agent and natural fillers on seed quality parameters, growth and yield of wheat. One year old seeds of two wheat varieties (HUW-234 and HD-2824) were coated with 5 different treatments viz., polykote @ 3 ml/kg seed alone (T 1), polykote @ 3 ml/kg + Trichoderma viride @ 3 g./kg seed (T 2), polykote @ 3 ml/ kg + insecticide (carbaryl) @ 3g/kg seed (T 3), polykote @ 3 ml/kg + neem oil @ 10ml/kg seed (T 4) and in combination of polykote @ 3 ml/kg + insecticide (carbaryl) @ 3g/kg seed + neem oil @ 10ml/kg seed (T 5), one uncoated set of seed was kept as control (T 0). The seeds were shade dried after coating and sown in field using Factorial Randomized Black Design in 3 replications with applying recommended doses of NPK (120:60:40). Results obtained revealed that wheat seed coating with polykote @ 3 ml/kg seed + insecticide (carbaryl) @ 3g/kg seed (T 3), + neem oil @ 10ml/kg seed significantly increased the seed quality parameters, growth, total dry matter production, yield attributes and finally the yield of wheat over uncoated control. Moreover, polymer (polykote @ 3 ml/kg seed) coating in combination of insecticide carbaryl @ 3g/kg seed or neem oil @ 10ml/kg seed separately also showed at par results compared to the combination of polykote @ 3 ml/kg + Trichoderma viride (@3 g./kg seed) which showed non-significant results on above parameters.
In a field experiment, one year old seeds of two late sown wheat varieties viz., HUW 234 and WR544 were primed with tap water and inorganic salts including KNO 3 and Mg (SO 4) 2 singly (in 0.2% solutions) for 12 hours. After priming, the seeds were taken out and allowed for shade drying till returning to their original moisture content. One set of unprimed control was also kept simultaneously. Those primed and unprimed seeds were sown in the last week of December during 2011-12 in allocated plots in four replicates following Factorial Randomized Block Design (RBD) at the research farm of IISR Lucknow, taken temporarily by Directorate of Seed Research, Mau. The data showed that seed priming with tap water and inorganic salts including KNO 3 and Mg (SO 4) 2 singly in 0.2 per cent solution for 12 h significantly enhanced seed germination, shoot/root length, seedling dry weight, vigour index and finally the total biomass and grain yield in both the varieties evaluated over unprimed control. Among the treatment, KNO 3 priming displayed maximum values in respect of all characters studied followed by Mg (SO 4) 2 and tap water. Varieties differed significantly in respect of shoot/root length, seedling dry weight, spike length, number of spikelets / spike, number of grains and test weight. Variety HUW 234 superceded WR 544 in respect of seedling dry weight, vigour index, number of tillers/ run. meter and total biomass whereas WR 544 displayed maximum seed germination, shoot/root length, plant height and finally the total grain yield. Differences between varieties were found to be significant for some characters, however, insignificant for remaining others.
Field experiment was conducted at Directorate of Seed Research, Mau for three consecutive years (2007-08 to 2010-11) with the seed priming of one year old two rice (Oryza sativa L.) varieties (Pusa Sugandha 5 and Sambha Mahsoori) with 0.25% KNO3 followed by coating with polykote (@3 ml/kg seed ) + complete Hoagland solution (@5ml/kg seed) and polykote + (-) Zn, (-) Fe, (-) Mn and (-) Cu Hoagland solutions separately. Priming with KNO3 salt followed by coating with polykote + complete Hoagland solution significantly enhanced the germination, seedling vigour and yield attributes in both the varieties over unprimed and uncoated control under salt stress condition. Variety Sambha Mahsoori was found superior over Pusa Sugandh 5 in respect of above characters.
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