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Singh A.P.,Indira Gandhi Krishi Vishwavidyalaya
Indian Journal of Ecology | Year: 2014

A field study was conducted in a rice - wheat cropping system, rotated for three consecutive years with different tillage systems vis-à-vis weed control practices. In the fourth year of study, their effect was evaluated in terms of physico-chemical, biochemical and microbiological properties of rice rhizosphere soil. The results of the investigation revealed that different type of tillage operations exhibited their effects on physio-chemical properties, organic carbon status, enzymes' activity, basal respiration rate and microbial population of rhizosphere soil of rice. Soil reaction (pH) tend towards normality due to conventional-conventional tillage system, however, EC was least affected by different tillage systems. Maximum organic carbon was found In rhizosphere soil under conventional-conventional tillage system. It was found that soil enzymes' activity and basal soil respiration was maximum under conventional-conventional tillage system, whereas, minimum under zero-zero tillage system. The acid phosphatase activity was found more than alkaline phosphatase activity. The microbial population study showed that conventional-conventional tillage system promoted the growth of fungal and bacterial population whereas zero-zero tillage system did not show any promotional activity of the concerned microbial population. Data of above microbial population were also supported by microbial biomass carbon status of soil. The results of weed management study envisaged that the use of recommended herbicides (Butachlor as pre-emergence and fenoxaprop-p-ethyl + ethoxysulfuron as post-emergence) significantly affected the EC, organic carbon status, enzymes activity (acid, alkaline phosphatase and dehydrogenase), basal soil respiration rate, microbial population and microbial carbon status in rhizosphere soil of rice. The above parameters were found significantly lower in herbicide treated plots compared to hand weeded and weedy check plots In all the growth periods of crop.

Kumar T.,Indira Gandhi Krishi Vishwavidyalaya | Jhariya D.C.,National Institute of Technology Raipur
Geocarto International | Year: 2015

In this study, an attempt has been made to apply Remote Sensing (RS) and geographic information system (GIS) to determine land quality for agriculture purpose using analytic hierarchy process technique. In this study, various thematic layers were used like organic matter content, soil texture, soil depth, soil pH, soil P, soil K, geomorphology, run-off potential, slope and land use/land cover to assess the land quality index of the study area for the agriculture purpose which were generated in the RS and GIS environment. The study area can be divided into four zones, viz. high quality, moderately quality, marginally quality and low quality according to their suitability of land quality for agriculture purpose. It was found that about 39.09, 31.24, 20.41 and 9.26% of the study area falls under high quality zone, moderately quality, marginally quality and low quality zone, respectively, for agricultural purpose. © 2015 Taylor & Francis.

Kumar P.,Indira Gandhi Krishi Vishwavidyalaya | Dhillon S.K.,Punjab Agricultural University | Kaur J.,Punjab Agricultural University
Indian Journal of Ecology | Year: 2014

The present investigations were undertaken to find out association among the economically important characters in different moisture regimes. Under normal irrigation level, seed yield exhibited significant positive correlation with 100-seed weight, early vigour and photosynthetic capacity, however, its association with canopy temperature was significantly negative. The significant positive association of seed yield with 100 seed weight, leaf water potential, plant height and head diameter was observed in second water stress environment. In third water stress environment, seed yield had significant positive correlation with early vigour, canopy temperature, head diameter and 100-seed weight but a significant negative correlation with leaf area index and number of days to maturity. In fourth stress condition, seed yield was found to have significant positive association with head diameter, 100 seed weight and leaf water potential. This indicated a shift in correlations under changing water stress environments. The study revealed that while selecting for high seed yield under different water stress conditions, the selection criteria should be based on the changing correlations among different characters, under different stress environments.

Ghosh L.,Indira Gandhi Krishi Vishwavidyalaya | Singh L.,Indira Gandhi Krishi Vishwavidyalaya
Tropical Ecology | Year: 2011

This study describes the variation in seed and seedling characters of Jatropha curcas L. Seeds of J. curcas were collected from 6 zones (geographical regions) within India and 4-6 provenances within each zone. Significant variation was found among zones and among different provenances within zones, for all traits of seed and seedlings of J. curcas. Among six zones, sub- humid to humid eastern, south eastern uplands, semi arid lava plateaus and central highlands showed maximum seed length, seed weight, oil content and plant height. All seed and seedling characters were lowest for humid western Himalayan zone. Among 32 provenances, Danikundi, Pendra road, Nainpur and Indore-1 provenances showed better seed and seedling characters. This study has implications for identifying potential seed sources of J. curcas for exploiting for higher oil content. © International Society for Tropical Ecology.

Yaswanth Kumar J.,Sri Venkateswara Veterinary University | Chari M.S.,Indira Gandhi Krishi Vishwavidyalaya | Vardia H.K.,Indira Gandhi Krishi Vishwavidyalaya
Livestock Research for Rural Development | Year: 2012

This experiment was intended to evaluate the effect of stocking of ducks on pond productivity and economic efficiency of Indian major Carps. This trial was conducted for 257 days started on September 2006 to May 2007 and evaluated the effect of stocking of ducks along with a control (without ducks) on pond productivity and economic efficiency of Indian major carps in ponds. The study was carried out in two ponds measuring 2.2 ha and 2.4 ha water area designated as INT (integrated pond) and CTL (control pond) respectively. The Indian runner ducks (Anas platyrhions) were used for the integrated system. Each pond was stocked with Indian major carps (Catla catla, Labeo rohita, Cirrhinus mrigala in a ratio of 3:3:4) were stocked at 6000 ha-1. The water quality parameters i.e. pH, dissolved oxygen, alkalinity and nutrient levels of water were higher in integrated pond than control pond (without ducks). Further plankton levels (Phyto and zooplankton) were also significantly higher in integrated pond. Indian major carps in the integrated ponds exhibited better body weight than the control pond. Better growth rate in fishes was contributed to a yield of 2029kg/ha of fish by stocking of ducks in INT pond than the yield 1286 kg/ha observed in the CTL pond.

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