A field research was carried out at agronomy field at Regional Agricultural Research Station, Khajura, Banke, Nepal from June to November 2012-2013 in order to evaluate drought tolerant rice genotypes under different nutrient levels in artificially created stress condition during reproductive stages. The field experiment was conducted in strip plot design with three replications. Three main-plots contain three different levels of fertilizers, each consisting of 14 subplots of genotypes. The result revealed that the rice genotypes showed the significant differences for days to flowering, days to maturity and grain yield. Genotype IR83381-B-B-137-1 produced the highest grain yield (3851 kg ha-1), followed by IR83383-B-B-141-2 (3130 kg ha-1). The differences was significant for no. of tillers hill -1, no. of panicles hill-1 and biomass yield kg ha-1. In terms of level of fertilizers; rice genotypes showed significant differences for days to maturity. Interaction effect was observed significant for days to maturity and no. of panicles. The correlation between tillers number hill-1 and panicle number hill-1 was the highest (0.994**) and in path analysis for grain yield; direct effect of biomass yield was the highest (0.58134).
The replacement of open pollinated varieties by hybrids is an effective way to increase the maize production. The access to hybrid maize is very limited for Nepalese farmers. In order to identify high yielding maize hybrids, eighteen maize hybrids were tested under coordinated varietal trial using randomized complete block design in two replicates in 2007/08 to 2008 /09 during winter seasons at National Maize Research Program, Rampur, Chitwan, Nepal. The results showed that, among studied traits, hybrids exhibited significant differences for tasseling, silking and grain yield in both years. The hybrid namely L3/L2 produced the highest grain yield (7.2 t/ha) followed by L1/L3 (6.4 t/ha) and P UTU-20/AG-27 (5.9 t/ha), respectively. The results indicated that these hybrids were promising; they should be tested under on-farms and promoted for general cultivation in Terai region of Nepal.
The objective of this study was to estimate grain yield stability of early maize genotypes. Five early maize genotypes namely Pool-17, Arun1EV, Arun-4, Arun-2 and Farmer's variety were evaluated using Randomized Complete Block Design along with three replications at four different locations namely Rampur, Rajahar, Pakhribas and Kabre districts of Nepal during summer seasons of three consecutive years from 2010 to 2012 under farmer's fields. Genotype and genotype × environment (GGE) biplot was used to identify superior genotype for grain yield and stability pattern. The genotypes Arun-1 EV and Arun-4 were better adapted for Kabre and Pakhribas where as pool-17 for Rajahar environments. The overall findings showed that Arun-1EV was more stable followed by Arun-2 therefore these two varieties can be recommended to farmers for cultivation in both environments.
This study was conducted to quantify the progress towards grain yield and agronomic traits in maize genotypes through mass selection. The original maize population and the population derived after five cycles of mass selection were planted for comparison at research field of National Maize Research Program, Rampur, Chitwan, Nepal during winter season of 2011-2012. The maize genotypes were Arun-1EV, Arun-4, Pool-17, P501SRCO × P502SRCO, BGBYPOP, Across9942 × Across9944, S99TLYQ-B, S99TLYQ-AB and S01SIWQ-3, respectively. The experiment was laid down in randomized complete block design with three replications. Each replication consisted of 180 rows; 20 rows of each genotypes. The results showed that there was significant reduction in plant height, ear height, tasseling days, silking days, disease severity however significant increment in grain yield. The results showed that phenotypic superiority of the selected population over the original population was obvious.
The major objective of this study is to assess the status of maize production and adoption of improved maize seeds in Tanahun district. The study also aims to determine the factors affecting the adoption of the improved seeds. 100 maize farmers from four different local bodies of Tanahun were selected by the purposive sampling method for the household survey. Descriptive statistics, chi-square test, independent samples t-test, one-way ANOVA, logit model and index score ranking method were used for the data analysis. The productivity of maize and annual income from maize were 767.62 kg/ha and Rs 9500 higher for the farmers using improved seeds as compared to those using the local seeds. The mean annual household income of farmers replacing the seeds yearly was Rs 18983 higher than the farmers replacing the seeds rarely. The frequency of the agriculture technician support and the frequency of seed replacement with the improved seed were found to significantly determine the adoption of the improved maize seeds. Farmers receiving the regular technician support were 15.726 times more likely to adopt the improved seeds as compared to those receiving the technician support rarely or never. The adopters had 458.10 kg/ha higher productivity than the non-adopters. Lack of irrigation facility was found to be the major problem in maize cultivation whereas the lack of timely availability of improved seed was found to be the most important constraint for the adoption of improved seeds. Int. J. Appl. Sci. Biotechnol. Vol 7(2): 279-288
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