Varietal evaluation of promising maize genotypes in mid hills of Nepal

Abstract

The varietal evaluation of hybrid maize (Zea mays L.) genotypes with desired performance is one of the main objectives of maize breeding program. Fourteen hybrid maize genotypes were evaluated for 17 quantitative and nine qualitative traits in randomized complete block design with three replications at Sundarbazar, Lamjung, Nepal during May to September, 2019. The major objective was to identify superior genotypes based on genotypic and phenotypic variability, heritability, genetic advance, and correlation between grain yield and yield associated traits. We observed significant differences for 17 quantitative traits among the tested genotypes. Large variation was observed for grain yield among genotypes. Genotype RL-24-0/ RL-111 had the lowest yield (5.53 mt/ha) and Pioneer had the highest yield (11.98 mt/ha) whereas check variety Rampur Hybrid-10 yielded of 8.23 mt/ha. Grain yield showed highly significant positive correlations with stem girth (r= 0.67) and number of ears (r=0.6), but significant negative correlation with anthesis-silking interval (r= -0.55). The dendrogram grouped 14 genotypes into four clusters. Cluster I incorporated the highest number (five) of genotypes, which also had highest cluster mean (average yield of ~10 mt/ha) for grain yield. Traits namely test weight, ear aspect, anthesis-silking interval, number of ears, and tassel branching had high genotypic and phenotypic coefficient of variations, and heritability along with high genetic advances, indicating that these traits can be considered for maize breeding program.

Genetic variability, heritability and genetic advance for growth, yield and yield related traits in maize genotypes

“…Ghimire and Timsina (2015) also obtained high GCV and PCV for yield. Neupane et al (2020) obtained similar results on ear height Plant height, kernels' rows ear -1 , cob diameter, days to fifty percent tasseling, days to fifty percent silking showed low GCV and PCV (Table 3). Neupane et al (2020) recorded similar results on plant height, kernels' rows ear -1 , days to fifty percent tasseling, days to fifty percent silking.…”

“…Neupane et al (2020) obtained similar results on ear height Plant height, kernels' rows ear -1 , cob diameter, days to fifty percent tasseling, days to fifty percent silking showed low GCV and PCV (Table 3). Neupane et al (2020) recorded similar results on plant height, kernels' rows ear -1 , days to fifty percent tasseling, days to fifty percent silking. Vashistha et al (2013), Jaiswal et al (2019 recorded similar results on plant height, days to fifty percent tasseling, days to fifty percent silking.…”

“…Ishaq et al (2015), Jaiswal et al ( 2019) obtained a significant result in tassel length. Rajesh et al ( 2013), Neupane et al (2020) obtained significant results in ear height, kernels' rows ear -1 , kernels row -1 , days to fifty percent tasseling, days to fifty percent silking and grain yield. Whereas, no significant differences were recorded in the traits plant height, cob length, cob diameter, anthesis silking interval and thousand kernel weight (Table 2).…”

“…High heritability was recorded on days to fifty percent tasseling (83.91%), ear height (80.69%), days to fifty percent silking (78.06%), tassel length (68.73%), grain yield (64.68%) and kernels' rows ear -1 (64.19%). High heritability means less effect of the environment on the expression of these traits (Neupane et al, 2020). Raut et al (2017), Neupane et al (2020) obtained high heritability on days to fifty percent tasseling, ear height, days to fifty percent silking and grain yield.…”

“…High heritability means less effect of the environment on the expression of these traits (Neupane et al, 2020). Raut et al (2017), Neupane et al (2020) obtained high heritability on days to fifty percent tasseling, ear height, days to fifty percent silking and grain yield. Taye (2014) obtained high heritability on ear height, days to fifty percent tasseling and days to fifty percent silking.…”