Shrikant Jagtap - Academia.edu (original) (raw)

Papers by Shrikant Jagtap

Asian Journal of Chemistry

The regioselective 1,4-addition of CuSCN catalyzed Grignard reagents to the substituted coumarins... more The regioselective 1,4-addition of CuSCN catalyzed Grignard reagents to the substituted coumarins are reported. The Li2MnCl4 reagent is used to transmetallate magnesium by manganese. It adds regioselectively to coumarins and forms 1,4-addition products with higher yield under the atmosphere of nitrogen gas and at a lower temperature

Transactions of the ASAE

ABSTRACT

Agriculture Ecosystems Environment, Dec 1, 2002

... Cited By in Scopus (29). Permissions & Reprints. Adaptation and evaluation of the CROPGRO... more ... Cited By in Scopus (29). Permissions & Reprints. Adaptation and evaluation of the CROPGRO-soybean model to predict regional yield and production *1. Shrikant S. Jagtap Corresponding Author Contact Information , E-mail The Corresponding Author and James W. ...

J Am Water Resour Assoc, 1999

Climate change has the potential to have dramatic effects on the agricultural sector nationally a... more Climate change has the potential to have dramatic effects on the agricultural sector nationally and internationally as documented in many research papers. This paper reports on research that was focused on a specific crop growing area to demonstrate how farm managers might respond to climate-induced yield changes and the implications of these responses for agricultural water use. The Hadley model was used to generate climate scenarios for important agricultural areas of Georgia in 2030 and 2090. Linked crop response models indicated generally positive yield changes, as increased temperatures were associated with increased precipitation and CO2. Using a farm management model, differences in climate-induced yield impacts among crops led to changes in crop mix and associated water use; non-irrigated cropland received greater benefit since irrigated land was already receiving adequate moisture. Model results suggest that farm managers will increase cropping intensity by decreasing fallowing and increasing double cropping; corn acreage decreased dramatically, peanuts decreased moderately and cotton and winter wheat increased. Water use on currently irrigated cropland fell. The potential for increased water use through conversion of agriculturally important, but currently non-irrigated, growing areas is substantial. (KEY TERMS: simulation modeling; crop response; agricultural economics and farm management; agricultural water use; irrigation; multidisciplinary.

The Ni 1-X Zn X Fe 2 O 4 ferrites have been prepared by the Sol-gel technique with the variation ... more The Ni 1-X Zn X Fe 2 O 4 ferrites have been prepared by the Sol-gel technique with the variation of zinc substitution from 0.0 to 1.0 and step increment of 0.2 using reagents of analytical grade. The phase purity of synthesized nano-compounds was characterized by infrared spectroscopy (IR) and powder X-ray diffraction analysis (XRD). The microstructural evolution and morphological features of obtained ferrites were studied by scanning electron microscopy (SEM). This variation of zinc substitution has a significant influence on the structural properties such as grain size, lattice constant, sintered density, X-rays density, porosity. Lattice parameters varied from 8.337 Ǻ to 8.490 Ǻ with the increase in zinc concentration from 0.0 to 1.0.

Uncertainty in agricultural responses using climate forecast Climate variability associated with ... more Uncertainty in agricultural responses using climate forecast Climate variability associated with ENSO is now predictable. This suggests a potential to tailor agricultural management to benefit from climate variability. Deterministic/stochastic crop model is recognized method to address climate sensitivities and are used routinely in decision/management formulation.

There is a growing demand for agrometeorological information that end-users can use and not just ... more There is a growing demand for agrometeorological information that end-users can use and not just interesting information. lo achieve this, each region/community needs to develop and provide localized climate and weather information for growers. Additionally, provide tools to help local users interpret climate forecasts issued by the National Weather Service in the country. Real time information should be provided for farmers, including some basic data. An ideal agrometeorological information system includes several components: an efficient data measuring and collection system; a modern telecommunication system; a standard data management processing and analysis system; and an advanced technological information dissemination system. While it is conventional wisdom that, Internet is and will play a major role in the delivery and dissemination of agrometeorological information, there are large gaps between the "information rich" and the "information poor" countries....

Single phase soft ferrite nano-crystallites could be synthesized by various methods. Most of the ... more Single phase soft ferrite nano-crystallites could be synthesized by various methods. Most of the methods start from preparation of powder or they are high temperature synthesis. We have tried to synthesize MgNiFe2O4 nano-crystallites at low temperature to improve their properties. NanocrystallineMgNiFe 2 O 4 has been synthesized by using the Sol-Gel auto-combustion method. It is a unique combination of the combustion and the chemical gelation processes. They are obtained as dried gel after the successful chemical reaction of these compositions of respective metal nitrate solutions in the midst of citric acid as catalyst. Synthesis of materials is confirmed using XRD from the report of single phase polycrystalline ferrite material. In this work, the Nano-size materials were synthesized for compositions of Mg 0.8 Ni 0.2 Fe 2 O 4 ., the prepared materials were sintered at 40C for 4 hours. The resulting powders were characterized by Infra-Red Spectroscopy (IR), X-Ray Diffraction (XRD) t...

Entire sub-Saharan Africa and pockets of Asian population is at risk of starvation. The problems ... more Entire sub-Saharan Africa and pockets of Asian population is at risk of starvation. The problems and possibilities are however quite different amongst the two regions. Africa with its less than 8% of land irrigated, 3% or more population growth rate, continues to practice only rudimentary, nonscientific form of agriculture. In Asia where input use is high, farmers are approaching economically optimum yield levels, making it difficult to sustain the same rate of yield gains. While efforts to improve long-term productivity on small scale farm must be accelerated, more emphasis must also be placed on research that will help farmers and governments better cope with expected increases in risks resulting from climatic fluctuations, use of limited water resources, poor market integration and other problems. Finally we believe that all appropriate scientific tools including advanced weather forecasting, information technologies such as models, decisions tools should be mobilized to help solve the problems facing small-scale farmers in developing countries. Due to lack of financial support, the network of meteorological stations do not adequately cover various agrometeorological zones to meet user needs. The general lack of confidence in the reliability of weather forecasts has caused farmers not trust and use the weather forecasts. Training opportunities for meteorological services staff in the use of modern tools like computer simulation modeling, remote sensing, geographic information systems as well as electronic instrumentation is needed.

Transactions of the ASAE, 1983

INTRODUCTION Soil mixing has become an integral part of a nursery production system. The methods ... more INTRODUCTION Soil mixing has become an integral part of a nursery production system. The methods used for preparing soil mix range from using a front-end loader for picking and dropping materials on a concrete pad for mixing to a continuous soil mixing system (Verma, 1973; ...

African Crop Science Journal, 1998

Maize productivity relationships were studied at Ibadan in the derived savanna of south- western ... more Maize productivity relationships were studied at Ibadan in the derived savanna of south- western Nigeria using the CERES-Maize simulation model at six crop densities ranging from 2.96 to 13.3 plants m -2 . The absolute growth rate for all plant components decreased linearly with density. The optimum density was highest for LAI, 9.35 plants m -2 , and lowest for

Solar Energy, 1992

The data on global irradiation incident on a horizontal surface in Port Harcourt during the 13yea... more The data on global irradiation incident on a horizontal surface in Port Harcourt during the 13year period 1977-1989 are analyzed and shown to vary with the climatic changes of the year. The range of variation is found to be greatest in August. Based on the calculated average monthly clearness index values only five seasonal patterns are identified for Port Harcourt. The percentage of days with duration of sunshine less than 1.5 h is 28.3% while that greater than 9 h is 4.3%. The Angstrom type of regression model relating total global irradiation to sunshine duration has been found to be reasonably adequate only if long-term average monthly values are used.

Theoretical and Applied Climatology, 1999

Reports of changes in the seasonal and annual rainfall in Nigeria suggests that a more detailed a... more Reports of changes in the seasonal and annual rainfall in Nigeria suggests that a more detailed analyses of the geographic extent of these changes and of their impact on agriculture could be of value. Variation in the growing season (April to September) rainfall from stations across Nigeria was analysed over the 30-yr period, 1960±90. Regression analyses were used to examine long-term trends. Principal component and cluster analyses were used to group stations with similar trends in standardised seasonal rainfall. Mean accumulated standardised seasonal rainfall were used to examine short-and medium-term trends for each of the groups identi®ed. Signi®cant (P 0.05) decreases in rainy season rainfall were found at 8 stations mostly in the Guinea and arid/semi-arid savannas of northern Nigeria, whereas no station showed signi®cant increases. Examination of the monthly (April through September) rainfall showed that only three ± Kano, Sokoto and Potiskum in the arid/semi-arid savanna ± of the twenty-three stations used in the analysis had declining rainfall trends for each of the months April to September and subsequently declining seasonal rainfall trends. However, 12 to 15 stations had consistently declining rainfall trends in atleast some but not all the growing season months. However, a similar pattern was not the case in terms of increasing rainfall trends, where only one to three stations had consistently increasing rainfall trends in some but not all of the months from April to September. Stations that showed increasing rainfall trends were in the southern parts of Nigeria. Six groups with similar patterns in standardised seasonal rainfall were identi®ed by Principal Component and Cluster analyses. For most of the groups, the period from 1967 to 1973 was that of consistently below average seasonal rainfall. However, the timing and extent of the decline varied with location. Common to stations in four of the six groups was a negative trend in seasonal rainfall for the period considered. The geographic variation in seasonal rainfall trends has tremendous agricultural signi®cance since there are indications that the reliability of the season is decreasing from the humid forest zone with positive seasonal trends to the arid/semi-arid savanna with sig-ni®cant negative seasonal trends.

Journal of the American Water Resources Association, 1999

Journal of Sustainable Agriculture, 1999

... Shrikant S. Jagtap is affiliated with the Agricultural and Biological Engineering Department,... more ... Shrikant S. Jagtap is affiliated with the Agricultural and Biological Engineering Department, 104 Rogers Hall, PO Box 110570, Gainesville, FL 32611-0570. ... 1 , respectively. Hand weeding was done at two and 5 weeks after planting. ...