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Sheshshayee, M. S.
- Nitrogen Uptake Rates and f-Ratios in the Equatorial and Southern Indian Ocean
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Authors
Affiliations
1 Physical Research Laboratory, Ahmedabad 380 009, IN
2 Department of Crop Physiology, University of Agricultural Sciences, Bengaluru 560 065, IN
3 National Centre for Antarctic and Ocean Research, Vasco-da-Gama, Goa 403 804, IN
1 Physical Research Laboratory, Ahmedabad 380 009, IN
2 Department of Crop Physiology, University of Agricultural Sciences, Bengaluru 560 065, IN
3 National Centre for Antarctic and Ocean Research, Vasco-da-Gama, Goa 403 804, IN
Source
Current Science, Vol 108, No 2 (2015), Pagination: 239-245Abstract
We report data on nitrate, ammonium and urea uptake rates from the Equatorial and Southern Indian Oceans. Productivity (0.81-2.23 mmol Nm-2 d-1) over the Equatorial Indian Ocean was low, but the f-ratio (0.13-0.45) was relatively high. In the Southern Indian Ocean total N-uptake rate varied from 1.7 to 12.3 mmol Nm-2 d-1; it was higher in the Antarctic coast (69°S) and lower over most of the Southern Ocean, the lowest being at 58°S. The f-ratio also showed significant spatial variation, but was higher compared to values at the Equatorial Indian Ocean. The mean f-ratio in the Southern Indian Ocean was 0.50. The nitrate-specific uptake rates and f-ratios appear to have increased significantly in the recent past relative to earlier estimates. While productivity in the Southern Ocean is comparable to that in the Equatorial Indian Ocean, higher f-ratios in the former underscore its importance in the uptake of CO2.Keywords
Carbon Sequestration, f-Ratio, Nitrogenuptake, Primary Productivity, Southern Ocean.Full Text
- Nitrogen Use Efficiency in Tomato (Lycopersicon esculentum L.) and French Bean (Phaseolus vulgaris L.) as Influenced by Coating of Urea with Neem Oil and Graded Levels of Nitrogen
Abstract Views :183 |
PDF Views:113
Authors
Affiliations
1 Division of Soil Science and Agricultural Chemistry, Indian Institute of Horticultural Research, Hessaraghatta Lake Post, Bangalore-560 089, IN
2 Department of Plant Physiology, University of Agricultural Sciences, Bangalore-560 065, IN
1 Division of Soil Science and Agricultural Chemistry, Indian Institute of Horticultural Research, Hessaraghatta Lake Post, Bangalore-560 089, IN
2 Department of Plant Physiology, University of Agricultural Sciences, Bangalore-560 065, IN
Source
Journal of Horticultural Sciences, Vol 2, No 2 (2007), Pagination: 119-122Abstract
In a pot-culture study, 'Arka Shrestha' tomato and 'Arka Komal' French bean were raised on red sandy-loam to compare urea coated with neem oil (2% w/w, NOCU) and prilled urea (PU) applied at 60, 80 and 100% of recommended N dose. To facilitate direct measurement of N use parameters, urea enriched with 15N (1 atom per cent excess) was used as the source of N. Compared to 'no urea' control, the application of N significantly increased dry matter production, fruit/pod yield as well as the parameters of N use. Prilled urea coated with neem oil (NOCU) was superior to PU in both the crops and produced 21% and 9% higher yield compared to the latter. Increasing the dose of N significantly increased dry matter production, yield and all parameters of N use. However, the interaction effects showed that N applied as NOCU at 80% the of recommended dose produced fruit/pod yield at par with that obtained at 100% of the recommended dose applied as PU in both crops. Corresponding fertilizer utilization achieved was 14.9% and 59.0% when 80% of N was applied as NOCU compared to 11.5% and 30.1 obtained when 100% of N was applied as PU in tomato and French bean, respectively.Keywords
Neem Coated Urea, Nitrogen Use Efficiency, Tomato, French Bean.Full Text
- Biology and Potential of Pentatomid Predator, Eocanthecona furcellata (Wolff) (hemiptera: Pentatomidae) on Fall Armyworm, Spodoptera frugiperda (Smith)
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PDF Views:175
Authors
A. Sravika
1,
A. N. Shylesha
2,
K. S. Jagadeesh
1,
T. M. Shivalingaswamy
3,
N. Nagaraju
4,
M. S. Sheshshayee
5
Affiliations
1 Department of Entomology, UAS, Bengaluru – 560065, Karnataka, IN
2 Division of Germplasm Conservation and Utilization, ICAR-NBAIR, Hebbal, Bengaluru – 560024, Karnataka, IN
3 Resource Management in Plant Protection, ICAR-NBAIR, Hebbal, Bengaluru – 560024, Karnataka, IN
4 Department of Plant Pathology, UAS, Bengaluru – 560065, Karnataka, IN
5 Department of Crop Physiology, UAS, Bengaluru – 560065, Karnataka, IN
1 Department of Entomology, UAS, Bengaluru – 560065, Karnataka, IN
2 Division of Germplasm Conservation and Utilization, ICAR-NBAIR, Hebbal, Bengaluru – 560024, Karnataka, IN
3 Resource Management in Plant Protection, ICAR-NBAIR, Hebbal, Bengaluru – 560024, Karnataka, IN
4 Department of Plant Pathology, UAS, Bengaluru – 560065, Karnataka, IN
5 Department of Crop Physiology, UAS, Bengaluru – 560065, Karnataka, IN
Source
Journal of Biological Control, Vol 34, No 1 (2020), Pagination: 26-29Abstract
Studies on the biology and feeding potential of Eocanthecona furcellata (Wolff) on Spodoptera frugiperda (Smith) were carried out at NBAIR, Bengaluru. Experimental results revealed that the total developmental period from egg to adult for male and female were 27.92±2.87 and 39.62±3.28 d, respectively. The life cycle of male and female passed through first, second, third, fourth and fifth nymphal instars (male: 2.42±0.51 d, 3.25±0.45 d, 3.25±0.45 d, 4.00±0.60 d, 4.42±0.51 d) and (female: 2.54±0.52 d, 3.46±0.52 d, 4.00±0.71 d, 4.38±0.65 d, 5.08±0.49 d), respectively. Total nymphal period is about 17.83±1.34 d for male and 19.46±1.20 days for female, respectively. Adult longevity of male is lower (10.25±2.96 d) compared to that of female (20.15±3.39 d). The premating period and mating period of adult E. furcellata was 2.33±0.50 days and 6.44±2.24 hrs, respectively. The pre-oviposition period, oviposition period of adult female was 2.89±0.60 and 11.22±1.72 days, respectively. The average number of eggs laid by the female was 209.29±28.11 in a single mated system. Egg incubation period was about 5.42±0.51 days. The predation rates of second, third, fourth, fifth instar nymphs, adult female and male on 2nd, 4th, 6th instar prey of E. furcellata were (16 ±0.95, 27 ±4.06, 55±4.67, 68 ±5.41, 126 ± 4.76, 97 ± 2.85), (7±1.34, 24±2.77, 40±3.39 45±0.71, 88±1.37, 51±1.60) and (4±0.82, 9±1.64, 21±2.81, 38±1.03, 69±1.32, 36±2.73), respectively.
Keywords
Biology, Developmental Period, Eocanthecona furcellata, Predatory Potential, Spodoptera frugiperda.Full Text
References
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- M. Udayakumar (1946–2021)
Abstract Views :193 |
PDF Views:73
Authors
Affiliations
1 Crop Physiology, University of Agricultural Sciences, GKVK, Bengaluru 560 065, IN
2 Division of Biotechnology, Indian Institute of Horticultural Research, Bengaluru 560 089, IN
3 I&B Seeds Pvt Ltd, Bengaluru 560 060, IN
1 Crop Physiology, University of Agricultural Sciences, GKVK, Bengaluru 560 065, IN
2 Division of Biotechnology, Indian Institute of Horticultural Research, Bengaluru 560 089, IN
3 I&B Seeds Pvt Ltd, Bengaluru 560 060, IN
Source
Current Science, Vol 121, No 4 (2021), Pagination: 588-589Abstract
No Abstract.Keywords
No keywordsFull Text
- Optimum density of Eocanthecona furcellata (Wolff) (Hemiptera:Heteroptera: Pentatomidae) to be considered for mass production under laboratory conditions
Abstract Views :246 |
PDF Views:189
Authors
A. Sravika
1,
A. N. Shylesha
2,
K. S. Jagadish
1,
T. M. Shivalingaswamy
3,
N. Nagaraju
4,
M. S. Sheshshayee
5
Affiliations
1 Department of Agricultural Entomology, UAS, Bengaluru – 560065, Karnataka, IN
2 Division of Germplasm Conservation and Utilization, ICAR-NBAIR, Hebbal, Bengaluru – 560024, Karnataka, IN
3 Division of Germplasm Conservation and Utilization, ICAR-NBAIR, Hebbal, Bengaluru –560024, Karnataka, IN
4 Department of Plant Pathology, UAS, Bengaluru – 560065, Karnataka, IN
5 Department of Crop Physiology, UAS, Bengaluru – 560065, Karnataka, IN
1 Department of Agricultural Entomology, UAS, Bengaluru – 560065, Karnataka, IN
2 Division of Germplasm Conservation and Utilization, ICAR-NBAIR, Hebbal, Bengaluru – 560024, Karnataka, IN
3 Division of Germplasm Conservation and Utilization, ICAR-NBAIR, Hebbal, Bengaluru –560024, Karnataka, IN
4 Department of Plant Pathology, UAS, Bengaluru – 560065, Karnataka, IN
5 Department of Crop Physiology, UAS, Bengaluru – 560065, Karnataka, IN
Source
Journal of Biological Control, Vol 35, No 1 (2021), Pagination: 1-5Abstract
Eocanthecona furcellata (Wolff) is a potential native predator of lepidopteran larvae that can be easily reared under laboratory conditions and released in augmentative biocontrol for management of pests in various crops. For successful mass production of any predator cannibalism under crowded rearing conditions is the major limiting factor. In the present study, attempts were made to know the ideal population considered for group rearing with minimal or no cannibalism. It was recorded that the predator population of 5 to 25 on Corcyra cephalonica (S.) and Galleria mellonella L. and 5 to 30 on Samia cynthia ricini Boisd. and Spodoptera litura F. was feasible for group rearing with higher percent survival rate when reared in different group arenas. The survival percent was higher on hosts, C. cephalonica, G. mellonella, S. litura and recorded lower on S. cynthia ricini under group rearing condition.
Keywords
Corcyra cephalonica, Eocanthecona furcellata, Galleria mellonella, Group Rearing, Optimum Density, Samia cynthia ricini, Spodoptera lituraFull Text
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- -5 April, pp. 58–73.