Hybrid is the most economical option to boost up the grain yield of maize, and slowly it is gaining popularity among the farmers of Nepal. In order to identify the potential hybrids suitable for Terai and Inner Terai regions, a set of experiment was conducted on hybrid maize developed by National Maize Research Program (NMRP), Rampur in Coordinated Variety Trials (CVTs) during the winter season of 2014/15 and 2015/16. The experiments were done by using Randomized Complete Block Design (RCBD). Each treatment was replicated thrice for each site at Rampur, Belachapi, Tarahara, and Parwanipur. Over the years, genotypes RML-83/RL-197 and RML-4/RL-111 yielded higher than other tested genotypes in Tarahara. Similarly, RL-180/RL-105, RML-87/RL-105, Dekalb double and Rampur Hybrid-6 produced higher grain yield at Belachapi during 2014/15. Genotype RML-4/RML-111 followed by RML-98/RL-105, and Rampur Hybrid-6 yielded higher at Parwanipur during 2015/16. In the case of Rampur, genotypes RML-98/RML-105 had produced higher yield in both the years whereas RML-5/RL-105 during 2014/15, and Rampur Hybrid-2 followed by RML-55/RL-105 were the superior genotypes in terms of grain yield during 2015/16. Those hybrids with higher grain yield in CVTs will be upgraded to Coordinated Farmers Field Trial on Hybrid (CFFTH) and these hybrids might be the potential future hybrids for Terai and Inner Terai of Nepal.
A study was conducted during June to September, 2012, in the field at National Maize Research Program, Rampur, Chitwan, Nepal with the objective of screening 20 maize genotypes against southern leaf blight caused by Bipolaris maydis. Experiment was laid out in a randomized complete block design with three replications. Disease scoring was done as percentage of leaf area infected on individual plant at 7 days intervals starting from 50 days after sowing, for 6 times, and disease severity and mean AUDPC were calculated and yield recorded. Among the tested genotypes, there was variation in disease severity and mean AUDPC values. Disease severity was maximum on Yellow Popcorn (51.67%) and least on RML-32/RML-17 (7.27%). Based on mean AUDPC values, RML-32/RML-17 (20.53) appeared most resistant, followed by RML-4/NML-2 (23.66) and RML-4/RML-17 (25.90), while Yellow Popcorn (136.9) was found the most susceptible. Highest grain yield (4.90 t/ha) was also recorded on RML-32/RML-17 and least (2.49 t/ha) on Yellow Popcorn. Therefore the genotypes RML-32/RML-17, RML-4/NML-2 and RML-4/RML-17 could be used as the resistant varieties and source of resistance to southern leaf blight for varietal development of maize.Journal of the Institute of Agriculture and Animal Science.Vol. 33-34, 2015, Page: 115-122
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