Papers by Ajay Kumar Verma
Research article, 2020
Region-specific vegetable diversity supporting vital nutritious produce to native people. ivy gou... more Region-specific vegetable diversity supporting vital nutritious produce to native people. ivy gourd is most prospective and perennial cucurbit. Its regional variability is not exploited much for developing genotypes suited to high temperature, low moisture stress and resources constraint dry-lands of rajasthan. With this objectives, targeted germplasm collection was done from 2001-2005 and selected types were studied from 2009 to 2013 at ICAR-CIAH, Bikaner. during spring-summer and rainy-winter season of 2014 to 2016, trait-specific elite-types tested and Thar Sundari exhibited superiority for parthinocarpic fruit yield and marketable quality with 32-45 o C day temperature conditions. Tender fruits ready in 6.28-8.42 days from opening of female flowers. Tender fruits are 5.83-6.48 cm length, 1.54-1.89 cm diameter and 11.76-13.54 g weight. Thar Sundari recorded 2.85-3.48 kg/plant/season fruit yield.
The present investigation was undertaken to study the type of gene action involved for green pod ... more The present investigation was undertaken to study the type of gene action involved for green pod yield and its components in cowpea and to estimate the general combining ability and specific combining ability of parents and crosses, respectively. The significance of both gca and sca variance for most of the characters indicated that both additive as well as non-additive types of gene actions were involved in the inheritance of these traits. The gca effects of parents suggested that 2014/COPBVAR-4, 2012/COPBVAR-2, 2014/COPBVAR-5 and Kashi Kanchan were good combiners for different yield components like number of flowers per cluster, number of pods per cluster, per cent pod set, number of pods per plant and days to last harvest. The Arka Garima, 2014/COPBVAR-5 and 2014/COPBVAR-4 were good general combiner for days to 50% flowering and Kashi Kanchan, 2014/COPBVAR-5 and 2012/COPBVAR-2 for green pod yield per plant. No single parent was found to be good for all the traits. Based on specific combining ability effects of the hybrids, the cross combination2014/COPBVAR-5 x Gomti was found to be the best combination both for number of pods per plant and green pod yield per plant. The other best specific combinations were 2012/COPBVAR-3 x Pusa Komal, 2012/COPBVAR-5 x Pusa Komal and 2012/COPBVAR-2 x Arka Garima with high positive sca effects and high mean for green pod yield per plant. These promising parents can be used in future breeding programmes and the crosses may be exploited for isolation of transgressive segregants from the segregating generations of these crosses for further improvement of pod yield in cowpea.
The present investigation was undertaken to study the hybrid vigour of parents and crosses respec... more The present investigation was undertaken to study the hybrid vigour of parents and crosses respectively. The experimental material comprised of six lines viz., 2012/COPBVAR-2, 2012/COPBVAR-3, 2012/COPBVAR-5, 2014/COPBVAR-4, 2014/COPBVAR-5 and 2014/COPBVAR-6 and four testers of cowpea viz. Gomti, PusaKomal, Kashi Kanchan and Arka Garima. The analysis of variance revealed significant differences between parents and hybrids as well indicating presence of sufficient amount of variability in all the characters studied. Eight hybrids recorded significant negative heterosis for days to 50% flowering. Five hybrids recorded significant positive heterobeltiosis and produced more number of flowers per cluster. Among them, 2012/COPBVAR-3 x Kashi Kanchan recorded the highest positive significant heterobeltiosis for flowers per cluster.
The field experiment was conducted at research farm of ICAR-Central Institute for Arid Horticultu... more The field experiment was conducted at research farm of ICAR-Central Institute for Arid Horticulture, Bikaner, Rajasthan during 2017-18 and 2018-19 to standardize the date of sowing and covering material. Under different dates of sowing and covering material long melon took 41-50, 44-55 and 50-62 days after sowing for first male flower, first female flower and first harvest at marketable stage, respectively. The treatment T3 (20 th December with polythene sheet) recorded the highest number of days for last harvest followed by T4 (20 th December with non-woven cloth), while the least number of days for last harvest was recorded in T9 (10 th February under open condition). The crop raised under tunnel (T2-10 th December with non-woven cloth) attained the harvestable maturity on 9 th February in comparison to open filed sowing (T9) came in harvesting on 2 nd April which was 49 days later than the tunnel. The sowing on second date of sowing with polythene covering (T3-20 th December with polythene sheet) recorded the highest yield and fruiting duration followed by the sowing on same date with non-woven cloth covering (T4-20 th December with non-woven cloth). An advancement of 24-50 days was recorded with first two dates of sowing as compared to normal season which fetches higher price in the market.
The present investigation was carried out to study the genetic variability, heritability and expe... more The present investigation was carried out to study the genetic variability, heritability and expected genetic advance for 18 traits in dolichos bean. The experimental material comprised of 12 genotypes of Lablab purpureus. The genotypes GL 243, Culture 47 and GL 671 are superior based on mean for pod yield. Wider variability was observed for plant height, number of secondary branches per plant, number of pods per inflorescence, number of inflorescence per plant, mean pod weight, number of pods per plant, 100-seed weight, pod yield per plant and pod yield per hectare. All these characters also recorded high heritability and genetic advance. Hence selection will be effective for these traits.
Research paper, 2019
The present investigation was carried out to study the genetic variability, heritability, expecte... more The present investigation was carried out to study the genetic variability, heritability, expected genetic advance for growth and yield traits in F2 generation of 24 hybrids of cowpea. Wide range of variability was observed for all the traits except number of branches per plant and pod width. The high genotypic coefficient of variation was recorded for number of pods per plant, number of pods per cluster, mean pod
weight and 100-seed weight. Higher heritability estimates coupled with high genetic advance as per cent of mean were observed for plant height, number of branches per plant, flowers per cluster, pods per
cluster, per cent pod set, days to last harvest, pod length, pod weight, number of seeds per pod, 100 seed weight and pod yield per plant. Hence, selection based on these characters would be rewarding for further improvement of cowpea.
Indian Horticulture, 2019
Brinjal is indigenous and most accepted vegetable crop of the year-round production but it fruits... more Brinjal is indigenous and most accepted vegetable crop of the year-round production but it fruits has regional preferences for size, shape, colour and quality attributes. On evaluation of wide range of germplasm, brinjal genotypes from favourable agro-climatic zones did not performed well under abiotic stressed conditions of hot arid region. Therefore, promotion of varieties from native genetic resource is found to be much beneficial and for that ICAR–CIAH, Bikaner has developed and recommended Thar Rachit for commercial cultivation under resource poor arid environment. It is very early in first harvesting and took 45 days from transplanting. It is prolific bearer (79.5–92.3 fruits) and marketable yield is 3.16–4.35 kg/plant. Grade – A fruits at marketable stage are oblong-round, small, dark purple and 39.8–46.2 g in weight.
Research paper, 2018
A field experiment was conducted to study the bulb attributes and B:C of garlic (Allium sativum L... more A field experiment was conducted to study the bulb attributes and B:C of garlic (Allium sativum L.) as influenced by NAA and thiourea with varying levels of nitrogen during the rabi season. The results indicated that among NAA and thiourea treatments, foliar application of thiourea 200 ppm to the garlic crop significantly increased fresh weight of bulb (50.69 g), bulb yield (134.58 q/ha) and net returns (1,08,062 /ha) and B: C ratio (1.34) as compared to control. Application of nitrogen 125 % of recommended dose of nitrogen significantly increased the weight of bulb (50.11 g) and bulb yield (138.89 q/ha) and net returns (1,13,662 /ha) and B: C ratio (1.40), which was statistically at par with application of 100 % of recommended dose of nitrogen. The interaction effect of NAA, thiourea and nitrogen was found significant on the fresh weight and yield of garlic bulb. The maximum fresh weight of bulb and yield (61.59 g and 159.64 q/ha) was recorded under treatment combination thiourea 200 ppm + 125 % recommended dose of nitrogen, respectively. However, it was found statistically at par to treatment thiourea @ 100 ppm + 125 % RDN and thiourea 200 ppm + 100 % recommended dose of nitrogen. B: C ratio was significantly influenced by interaction effect of growth regulators and nitrogen application. However, the application of thiourea 200 ppm + 125 % recommended dose of nitrogen recorded maximum B: C ratio 1.76 for garlic crop, which was at par with treatments thiourea 200 ppm + 100 % recommended dose of nitrogen, thiourea 100 ppm + 125 % recommended dose of nitrogen and thiourea 100 ppm + 100 % recommended dose of nitrogen.
Pod characters like pod length, pod weight, number of pods per cluster and number of pods per pla... more Pod characters like pod length, pod weight, number of pods per cluster and number of pods per plant are very important yield component which determines the marketable green pod yield in vegetable cowpea. Ten parents involving six lines and four testers of cowpea and their respective hybrids generated through L x T fashion were evaluated for their per se performance for sixteen characters. The maximum pod yield per plant was in 2014/COPBVAR-6 among lines followed by 2014/COPBVAR-5, 2012/COPBVAR-3, whereas Gomti out yielded all the testers in terms of pod yield per plant. Genotype 2012/COPBVAR-3 had the highest pod length and mean pod weight as well among the lines. Genotype 2014/COPBVAR-4 was the earliest in flowering among the lines. Genotype 2014/COPBVAR-6 had the lowest plant height and the highest number of branches per plant among the lines. These parents can be used for hybridization program for future improvement of the respective characters in cowpea. Among the crosses, the highest marketable green pod yield per plant was in 2014/COPBVAR-6 x Pusa Komal which was followed by 2014/COPBVAR-6 x Kashi Kanchan, 2014/COPBVAR-6 x Gomti, 2014/COPBVAR-5 x Pusa Komal and 2014/COPBVAR-5 x Gomti. Number of pods per plant and 100-seed weight were also higher in these crosses and the average maximum number of pods per plant was when line 2014/COPBVAR-6 was used as female parent. Among other attributes the cross 2014/COPBVAR-5 x Pusa Komal recorded the maximum pod length whereas 2012/COPBVAR-2 x Gomti recorded the maximum pod width. The maximum mean pod weight was in 2012/COPBVAR-3 x Kashi Kanchan and the earliest flowering was in 2012/COPBVAR-3 x Kashi Kanchan. The lowest plant height was in 2012/COPBVAR-5 x Arka Garima and the highest number of branches per plant was in 2012/COPBVAR-3 x Kashi Kanchan indicating the scope for selection of suitable initial breeding material for further improvement as per the requirement such as high yielding, early and bushy type varieties/hybrids.
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Papers by Ajay Kumar Verma
weight and 100-seed weight. Higher heritability estimates coupled with high genetic advance as per cent of mean were observed for plant height, number of branches per plant, flowers per cluster, pods per
cluster, per cent pod set, days to last harvest, pod length, pod weight, number of seeds per pod, 100 seed weight and pod yield per plant. Hence, selection based on these characters would be rewarding for further improvement of cowpea.
weight and 100-seed weight. Higher heritability estimates coupled with high genetic advance as per cent of mean were observed for plant height, number of branches per plant, flowers per cluster, pods per
cluster, per cent pod set, days to last harvest, pod length, pod weight, number of seeds per pod, 100 seed weight and pod yield per plant. Hence, selection based on these characters would be rewarding for further improvement of cowpea.