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  • Cambridge University Press (CUP)  (79)
  • 1
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    ENVIRONMENTAL CHARACTERIZATION OF FLOODWATER IN EASTERN INDIA: RELEVANCE TO SUBMERGENCE TOLERANCE OF LOWLAND RICE
    Cambridge University Press (CUP) ; 1999
    In:  Experimental Agriculture Vol. 35, No. 2 ( 1999-04), p. 141-152
    Details
    In: Experimental Agriculture, Cambridge University Press (CUP), Vol. 35, No. 2 ( 1999-04), p. 141-152
    Abstract: Floodwater was characterized through field surveys over three years in rainfed lowland and deepwater rice areas of Eastern India. Measurements focused on dissolved O 2 and CO 2 , pH and irradiance during flash floods in rice fields. Over locations and time, dissolved O 2 concentrations ranged from zero to 0.28 mol m −3 (0–1.1 times air-saturated water at 30 °C) while dissolved CO 2 ranged from 0.28 to 1.96 mol m −3 (31–217 times air-saturated water). Floodwater pH varied from 6.6 to 9.7. Irradiance decreased with depth in the water profile to an extent depending on turbidity. Turbidity varied greatly over locations and time. The significance of these measurements in assessing rice submergence tolerance is discussed.
    Type of Medium: Online Resource
    ISSN: 0014-4797 , 1469-4441
    URL: Article
    DOI: 10.1017/S0014479799002057
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1999
    detail.hit.zdb_id: 2016166-9
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  • 2
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    Genetic diversity and population structure analysis in early generations maize inbreds derived from local germplasm of Eastern Himalayan regions using microsatellite markers
    Cambridge University Press (CUP) ; 2023
    In:  Plant Genetic Resources: Characterization and Utilization
    Details
    In: Plant Genetic Resources: Characterization and Utilization, Cambridge University Press (CUP)
    Abstract: The North-Eastern region (NER) of India falls under the Eastern Himalayan region and it is a bio-diversity hub. Diverse maize landraces with wide adaptability to extreme climatic and soil scenario like heavy rainfall, drought and acidic soil conditions have been grown in NER since time immemorial. However, maize diversity in NER region has drastically reduced due to introduction of high yielding varieties and hybrids. Modern maize breeding programmes are focused on high yield but other unique traits like stay green trait, prolificacy (more than one fertile ear per plant), self-fertilizing ability are also important and the local germplasm of the NER region can contribute with these unique traits. Prior to the selection of any lines in several breeding programmes, assessment of genetic diversity and population structure are basic requirements. Hence, in the present study assessment of genetic diversity and population structure study in 30 maize inbreds developed from different germplasm of NER was undertaken using SSR markers, selected for their broad distribution throughout the genome, in order to assess the extent of allelic diversity among the lines and whether any population structure could be established. In addition to assessing molecular diversity, the study aims to evaluate the potential for yield and other beneficial and unique alleles that have high potential to contribute in the genetic enhancement programme of maize.
    Type of Medium: Online Resource
    ISSN: 1479-2621 , 1479-263X
    URL: Article
    DOI: 10.1017/S1479262123000862
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2023
    detail.hit.zdb_id: 2180556-8
    SSG: 12
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  • 3
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    Conservation tillage and microbially mediated integrated phosphorus management enhance productivity, profitability and energy use efficiency of maize
    Cambridge University Press (CUP) ; 2023
    In:  The Journal of Agricultural Science Vol. 161, No. 3 ( 2023-06), p. 373-386
    Details
    In: The Journal of Agricultural Science, Cambridge University Press (CUP), Vol. 161, No. 3 ( 2023-06), p. 373-386
    Abstract: Sustainability of maize production systems is threatened by poor economic returns and resource intensiveness. Therefore, an experiment was conducted at the ICAR-Indian Agricultural Research Institute, New Delhi during 2016–17 to 2017–18 to assess the effect of tillage and microbial inoculantsintegrated phosphorus (P) management on productivity, quality, economic outcome and energy dynamics of maize. Three tillage practices viz., CT–R (conventional tillage with no residue), ZT–R (zero tillage with no residue) and ZT + R (zero tillage with wheat crop residue at 2.5 Mg/ha) were assigned in main plots and five P management practices viz., P1 (control–NK as per recommendation, but no P), P2 (17.2 kg P/ha), P3 (17.2 kg P/ha + PSB), P4 (17.2 kg P/ha + compost inoculants) and P5 (34.4 kg P/ha) were allocated in subplots in three times replicated split-plot design. The maximum grain yield (5.96 Mg/ha), protein content (9.13%), protein yield (546 kg/ha) and gross energy returns (209 × 10 3 MJ/ha) were recorded under ZT + R while higher benefit: cost ratio (B: C ratio – the amount of economic gain per unit investment) (1.53) and energy efficiency (12.5) was noticed under ZT–R. Among the P management practices, the application of 34.4 kg P/ha recorded the highest grain yield (6.45 Mg/ha), protein content (9.34%), protein yield (603 kg/ha), B: C ratio (1.65) and energy efficiency (10.1). The results suggested that the application of P at the rate of 34.4 kg/ha under ZT + R is an economically robust approach for the quality maize production in semi-arid region.
    Type of Medium: Online Resource
    ISSN: 0021-8596 , 1469-5146
    URL: Article
    DOI: 10.1017/S0021859623000266
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2023
    detail.hit.zdb_id: 1498349-7
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  • 4
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    Temperature-based phenology model for predicting the present and future establishment and distribution of recently invasive Spodoptera frugiperda (J. E. Smith) in India
    Cambridge University Press (CUP) ; 2022
    In:  Bulletin of Entomological Research Vol. 112, No. 2 ( 2022-04), p. 271-285
    Details
    In: Bulletin of Entomological Research, Cambridge University Press (CUP), Vol. 112, No. 2 ( 2022-04), p. 271-285
    Abstract: Fall armyworm, Spodoptera frugiperda (J. E. Smith) is a polyphagous and highly destructive invasive insect pest of many crops. It was recently introduced into India and widely reported in almost all parts of India. Development of a temperature-based phenology model for predicting its rate of development and distribution will help in understanding the establishment and further spread of introduced invasive insect pests. Development, survival and reproduction parameters of S. frugiperda at six constant temperature conditions (15, 20, 25, 27, 30 and 35°C) were investigated and further validated with data generated under fluctuating temperature conditions. The estimated lower developmental threshold temperatures were 12.1°C for eggs, 11°C for larvae, 12.2°C for pupae, 15.13°C for males and 12.66°C for females. Degree-day (DD) requirements for the development of the different stages of S. frugiperda were 50, 250 and 200 DD for egg, larva and pupa, respectively. The best-fitted functions were compiled for each life stage to yield a phenology model, which was stochastically simulated to estimate the life table parameters. The developed phenology model predicted temperature ranges between 27 and 30°C as favourable for S. frugiperda development, survival and reproduction. The results revealed that maximum net reproductive rate (215.66 females/female/generation) and total fecundity (981.08 individuals/female/generation) were attained at 30°C constant temperature. The mean length of generations decreased from 74.29 days at 15°C to 38.74 days at 30°C. The maximum intrinsic rate of increase (0.138 females/female/day) and shortest doubling time (4.9 days) were also observed at 30°C. Results of simulated life table parameters showed high temperature-dependent development of S. frugiperda and complete development within all the tested constant temperature ranges (15–35°C). Simulated life table parameters for predicting risk indices of S. frugiperda in India indicated a significant increase in activity indices and establishment risk indices with a higher number of generations during future (2050 and 2070) climatic change scenarios compared to present conditions. Our results indicate that India will be highly suitable for the establishment and survival of S. frugiperda in future time periods.
    Type of Medium: Online Resource
    ISSN: 0007-4853 , 1475-2670
    URL: Article
    DOI: 10.1017/S0007485321000882
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2022
    detail.hit.zdb_id: 1496538-0
    SSG: 12
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  • 5
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    Anomalous absorption of a radio wave in the ionosphere
    Cambridge University Press (CUP) ; 1993
    In:  Journal of Plasma Physics Vol. 50, No. 3 ( 1993-12), p. 403-412
    Details
    In: Journal of Plasma Physics, Cambridge University Press (CUP), Vol. 50, No. 3 ( 1993-12), p. 403-412
    Abstract: A radio wave transmitted into the ionosphere in the presence of a lower-hybrid drift wave excites a Langmuir wave, which is then damped by electrons, thereby heating them. This constitutes an important absorption mechanism. We evaluate the potential of the Langmuir wave and obtain an expression for the ratio P r of the power of the Langmuir wave to that of the incident radio wave in the inhomogeneous ionosphere. It is found that the radio wave suffers an absorption of about 8% for a density fluctuation n 1 /n 0 = 5%, but the electric field of the Langmuir wave becomes about 11.7 times that of the radio wave, which can lead to the excitation of parametric instabilities in the ionosphere.
    Type of Medium: Online Resource
    ISSN: 0022-3778 , 1469-7807
    URL: Article
    DOI: 10.1017/S0022377800017232
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1993
    detail.hit.zdb_id: 2004297-8
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  • 6
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    Comparative assessment of soil water balance under wheat in a subtropical environment with simplified models
    Cambridge University Press (CUP) ; 1997
    In:  The Journal of Agricultural Science Vol. 128, No. 4 ( 1997-06), p. 461-468
    Details
    In: The Journal of Agricultural Science, Cambridge University Press (CUP), Vol. 128, No. 4 ( 1997-06), p. 461-468
    Abstract: Water balance components under wheat were assessed by employing two simple models, differing in their structure and data requirements, namely the soil-plant–atmosphere–water (SPAW) model of Saxton (1989) and the water balance model (WBM) of Arora et al . (1987). A few modifications based on the SPAW model procedure for the estimation of green canopy were used in a modified WBM and its performance was also tested. Soil water loss (the sum of interception evaporation, soil evaporation, plant transpiration and deep drainage) from sowing to harvest, simulated with the WBM, modified WBM and the SPAW model, had a close correspondence with the measured sum of profile water depletion, rainfall and irrigation for values ranging between 18·3 and 42·7 cm. Estimates of drainage with the WBM and modified WBM using empirical coefficients were greater than those calculated using the SPAW model for situations where the upward flow of water into the root-zone was negligible. Estimates of soil water evaporation using the WBM and modified WBM were invariably smaller than those using the SPAW model. A comparison of simulated and measured soil water storage and a correlation analysis of simulated transpiration with measured biomass at harvest showed that the performance of the WBM was the most realistic of the three models. However, it requires the input of leaf area index values to infer green canopy for each water supply regime. In the absence of this information, the modified WBM and SPAW models are more useful for assessing water balance components in cropped soils.
    Type of Medium: Online Resource
    ISSN: 0021-8596 , 1469-5146
    URL: Article
    DOI: 10.1017/S0021859697004358
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1997
    detail.hit.zdb_id: 1498349-7
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  • 7
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    Estimating Potato Tuber Yield in a Sub-tropical Environment with Simple Radiation-Based Models
    Cambridge University Press (CUP) ; 1995
    In:  Experimental Agriculture Vol. 31, No. 1 ( 1995-01), p. 65-73
    Details
    In: Experimental Agriculture, Cambridge University Press (CUP), Vol. 31, No. 1 ( 1995-01), p. 65-73
    Abstract: Dry matter and tuber yields of potato grown in a sub-tropical environment were estimated employing simple radiation-based models which require meteorological information on air temperature and solar radiation. Two versions of the MacKerron and Waister (1985) model, in which estimation of dry matter accumulation relies on a single composite parameter, radiation use efficiency (RUE), were compared with the Versteeg and Van Keulen (1986) model, which explicitly accounts for temperature and radiation effects on dry matter accumulation. In the original version of the MacKerron and Waister model, a linear change in the radiation interception factor with leaf area index is assumed; in the modified version an exponential change in the interception factor with leaf area index is considered. The accumulation of dry matter estimated from all three models was close to the measured values throughout the growing season, but estimates of tuber yield differed widely. Our analysis showed that the best agreement with measured values was obtained using the MacKerron and Waister linear model with RUE values adjusted according to the incident radiation level. Estimatión del rendimiento del tubérculo de la patata
    Type of Medium: Online Resource
    ISSN: 0014-4797 , 1469-4441
    URL: Article
    DOI: 10.1017/S0014479700025023
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1995
    detail.hit.zdb_id: 2016166-9
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  • 8
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    NEW PRACTICES IN THE CULTIVATION OF THE MINT, MENTHA ARVENSIS IN THE INDO-GANGETIC PLAINS
    Cambridge University Press (CUP) ; 2003
    In:  Experimental Agriculture Vol. 39, No. 2 ( 2003-04), p. 199-207
    Details
    In: Experimental Agriculture, Cambridge University Press (CUP), Vol. 39, No. 2 ( 2003-04), p. 199-207
    Abstract: India is the world's dominant producer of crude Mentha arvensis oil, and exporter of its processed derivative, natural menthol. This status has been achieved through superior product price competitiveness resulting from progressive agronomic improvements that include a transition from cultivation of this mint as a semi-perennial to an annual crop. This paper describes and analyses recent developments in Indian M. arvensis cultivation. Observations were made during 1998/99 and 1999/2000 in the fields of 295 farmers in the central Indo-Gangetic plains area. The criteria recorded included: mint cultivars used; the planting, weeding, irrigation, pesticide application and harvesting schedules; crop health in relation to diseases and pests; yields of the harvested herb and the distilled essential oil; the oil menthol content; and the net income. Most of the farmers used the cultivar, Kosi. The performance and returns of Kosi transplanted in April had proved superior to Kosi and Shivalik suckers and to transplanted Shivalik. The returns from late-transplanted Kosi were in the range of Rupees (Rs) 25 000 to Rs 40 000 ha −1 (Rs 50≈US$1), similar to those from Kosi suckers and much higher than for both transplanted and suckers of Shivalik. This survey revealed that rotations of rice ( Oryza sativa ) with chickpea ( Cicer arietinum ) and mint, and pigeonpea ( Cajanus cajan ) with wheat ( Triticum aestivum ) and mint could be profitable in the central Indo-Gangetic plains. They also conserved inputs and were preferable to the conventional rice-wheat rotation. A re-survey in the summer of 2002 confirmed that recommendations made to farmers have led to the adoption of the Kosi and Himalaya cultivars in 80% of the survey region and that 70% of mint cultivation in the area occurs in the summer season.
    Type of Medium: Online Resource
    ISSN: 0014-4797 , 1469-4441
    URL: Article
    DOI: 10.1017/S0014479702001205
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2003
    detail.hit.zdb_id: 2016166-9
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  • 9
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    Study of Pulsations in the Nova-like Variable KR Aur and the Intermediate Polar BG CMi
    Cambridge University Press (CUP) ; 1991
    In:  Publications of the Astronomical Society of Australia Vol. 9, No. 2 ( 1991), p. 279-280
    Details
    In: Publications of the Astronomical Society of Australia, Cambridge University Press (CUP), Vol. 9, No. 2 ( 1991), p. 279-280
    Abstract: Fast photometric observations of a nova-like variable KR Aurigae and the intermediate polar BG CMi (3A0729+103) were made in the B and U bands during 1984–89 to study pulsations in them. The light curves of KR Aur show large amplitude quasi-periodic pulsations with periods in the range 500–800s which can be ascribed to inhomogeneities in the accretion disc. The light curves of the X-ray emitting intermediate polar BG CMi show variable amplitude pulsations with 913s period. From the times of maxima of the pulsations obtained from observations over the period 1984–1989, the pulsation period is derived to be 0.010572966 ± 8 days and the spin-up rate to be (−5.7 ± 0.5) × 10 −11 ss −1 . The spin-up rate is consistent with the pulsating source being a white dwarf and not a neutron star.
    Type of Medium: Online Resource
    ISSN: 1323-3580 , 1448-6083
    URL: Article
    DOI: 10.1017/S1323358000024139
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1991
    detail.hit.zdb_id: 2560489-2
    detail.hit.zdb_id: 2079225-6
    SSG: 16,12
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  • 10
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    Genetic architecture, physio-biochemical characterization and identification of elite cytoplasmic male sterile (pt-CMS) based combiners in developing antioxidant-rich carrot
    Cambridge University Press (CUP) ; 2021
    In:  Plant Genetic Resources: Characterization and Utilization Vol. 19, No. 6 ( 2021-12), p. 484-496
    Details
    In: Plant Genetic Resources: Characterization and Utilization, Cambridge University Press (CUP), Vol. 19, No. 6 ( 2021-12), p. 484-496
    Abstract: Existence of genetic divergence, appropriate characterization of breeding lines for economically important traits and determining parents with favourable alleles is the crux of crop genetic improvement programmes. This study is the first report of unravelling genetics and potential of petaloid-type cytoplasmic male sterile (pt-CMS) lines in carrot. Ten pt-CMS lines were crossed with 10 inbreds in line × tester mating fashion to generate 100 testcross progenies. Nutritional profiling of the 100 testcrosses progenies along with 20 parental types was carried out for two consecutive years for eight important traits to identify superior combiners. The pooled analysis revealed that the carotenoid content in root is under the genetic control of major genes (oligogenic). The pooled analysis revealed less than unity value of σ 2 A / D and σ gca 2 / σ sca 2 for majority of the traits depicting preponderance of non-additive gene effects. The pt-CMS lines KT-28A, Kt-62A, KT-80A and KT-95A were identified as good combiners for carotenoids. The cross combination, KT-98A × KS-50 identified as the best heterotic combiner for CUPRAC and FRAP content over the years. Similarly, the combinations, KT-62A × KS-21, KT-80A × New Kuroda and KT-62A × KS-59 were found promising across the years for developing nutritionally rich F 1 hybrids. The interaction analysis among the different antioxidant traits and plant pigments unveiled the scope of simultaneous improvement.
    Type of Medium: Online Resource
    ISSN: 1479-2621 , 1479-263X
    URL: Article
    DOI: 10.1017/S1479262121000599
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2021
    detail.hit.zdb_id: 2180556-8
    SSG: 12
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