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Coimbatore, India

Senthilkumar T.,Agricultural Machinery Research Center | Manian R.,AEC and RI | Kathirvel K.,TNAU
AMA, Agricultural Mechanization in Asia, Africa and Latin America | Year: 2011

The influence of the selected level of variables of three levels of blades (viz. 2, 3 and 4), four levels of peripheral velocity (viz. 21.52, 23.80, 26.58 and 28.60 ms -1), three levels of blade thickness (viz. 2,4 and 6 mm) and four levels of blade rake angle (viz. 0, 15, 30 and 45 deg) on shredding efficiency of an experimental cotton stalk shredder, in terms of length of cut of cotton stalk, was investigated. Increase in peripheral velocity from 21.52 to 28.60 ms -1 resulted in decreased length of cut. The lowest value of length of cut was 113.83 mm with 2 blades, 0 deg blade rake angle and 28.60 ms -1 peripheral velocity. At 0 deg blade rake angle, the length of cut of shredded cotton stalk was much lower than other blade rake angles at 6 mm blade thickness. Increase in number of blades from 2 to 4 resulted in increased length of cut for all the levels of blade rake angle. Increase in blade rake angle from 0 to 45 deg resulted in increased length of cut for all levels of peripheral velocity and number of blades. Two blades with 0° blade rake angle, 6 mm blade thickness and 28.60 ms -1 peripheral velocity recorded the lowest value of length of cut. Source

Umakanth A.V.,Directorate of Sorghum Research | Patil J.V.,Directorate of Sorghum Research | Rani C.,Directorate of Sorghum Research | Gadakh S.R.,Sorghum Research Station | And 3 more authors.
Sugar Tech | Year: 2012

Till date only one sweet sorghum hybrid CSH 22SS has been released for general cultivation in India and the current levels of new hybrids are unable to surpass this hybrid. The objective of this study was to assess the general and specific combining abilities of eight parents and 16 hybrids respectively at three semi arid locations by following a line × tester mating design. Significant differences among environments, testers, environments × testers and environments × line × tester effects were observed for all traits suggesting the environmental influence on testers and the interactions. The variance component estimates of specific combining ability (SCA) were greater than that of general combining ability (GCA) for total biomass, juice extraction and grain yield indicating the non-additive control of genetic variation while the GCA variance was higher than the SCA variance for fresh stalk yield, juice yield, brix content, total sugar yield and computed bioethanol yields indicating additive gene action. Among females, DMS 28A for fresh stalk, juice and grain yields and DMS 25A for brix content were promising. Rio was a potential male parent for fresh stalk yield, total sugar content, computed bioethanol and grain yields. These parents can be exploited to address ethanol production from juice without compromising on grain yields. The best hybrids for total biomass, fresh stalk yield, juice yield, juice extraction, total sugar content and computed bioethanol yields were DMS 13A × Rio and DMS 23A × RS 647 and after adequate testing across many locations, these hybrids are recommended for commercial exploitation for ethanol production. © 2012 Society for Sugar Research & Promotion. Source

Laboratory experiment was conducted at the Insectary, Department of Agricultural Entomology, Tamil Nadu Agricultural University, and Coimbatore during 2012-2013 to study the acute toxicity of emamectin benzoate 5 SG to earthworm, Eudrilus eugeniae (Kinberg). The acute toxicity study results indicated that the LC50 value of emamectin benzoate for E. eugeniae by artificial soil test bioassay method was 17.22 ppm in soil at 2 DAT. Whereas, the respective LC50 value of emamectin benzoate 5 SG to E. eugeniae at 2 days by cow dung test bioassay method was 16.47 ppm. Source

Sunitha R.,TNAU | Mahimairaja S.,Tamil Nadu Agricultural University
Nature Environment and Pollution Technology | Year: 2014

Chromium, in the trivalent form (Cr III), is an important component of a balanced human and animal diet and its deficiency causes disturbance to the glucose and lipids metabolism in them. But the concentration above the permissible limit causes the crop failure and human health impacts. In contrast, hexavalent Cr (Cr VI) is highly toxic, carcinogen and may cause death in animals and humans if ingested in large doses. Recently, concern about Cr as an environmental pollutant has been escalating due to its buildup to toxic levels in the environment as a result of various industrial and agricultural activities. In our study, a reduction of chromium of about 87 per cent was recorded in sunflower field. At the same time reduction of only 33.8 per cent from the initial concentration of Cr in the surface soils under sunflower was observed due to the addition of organic amendments. Such reduction is attributed to the formation of either organo-chromic complexes (Immobilization) or chelates. Phytostabilization utilizes the plant production of compounds, which immobilize contaminants at the interface of roots and soil, or root and water. An example of this method is where root exudates cause the precipitation of metals, reducing their bioavailability. Source

Thirugnanavel A.,ICAR Research Complex for NEH Region | Balamohan T.N.,Horticultural College and Research Institute | Karunakaran G.,Central Horticultural Experimental Station | Manoranjitham S.K.,TNAU
Indian Journal of Agricultural Sciences | Year: 2015

The field experiment was conducted during 2008 - 2010 to study the effect of papaya ringspot virus - type P on growth, yield, and quality of papaya (Carica papaya L.) varieties under PRSV infected conditions at Tamil Nadu Agricultural University, Coimbatore. Significant variation was observed for disease score, DAS-ELISA, tree growth, fruit parameters, yield, and quality characters among the varieties evaluated. The results revealed that all the papaya varieties tested were ELISA positive and PRSV adversely affected the growth, yield and quality of papaya varieties. Among the cultivars evaluated, CP 50 performed better even under PRSV infected conditions and recorded the lowest disease score (1.9), ELISA value (0.198), highest plant height (255.60 cm), stem girth (41.76 cm), number of leaves (41.78), maximum yield (29.26 fruits/plant), dry papain production (8.3 g dry papain/fruit) and tyrosine unit (139.2). Source

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