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Geetha P.,Agricultural College and Research Institute TNAU | Geetha P.,Sugarcane Breeding Institute | Balasubramaniyan P.,Agricultural College and Research Institute TNAU | Balasubramaniyan P.,Dry Land Agricultural Research Station TNAU
Annals of Agri Bio Research | Year: 2016

A field experiment was conducted to study the effect of integrated nutrient management practices on non-basmati quality rice cultivars viz., Jeeraga Samba, Kitchili Samba and Improved White Ponni during samba season (September-February, 2008) at Central Farm of Agricultural College and Research Institute (TNAU), Madurai, Tamil Nadu. The experiment was laid out in split plot design with four replications. Three cultivars such as Jeeraga Samba (V1), Kitchili Samba (V2) and White Ponni (V3) formed the main plot treatments and four methods of nutrient management such as green manure @ 6.25 t/ha+50% recommended dose of fertilizer (S1), green manure @ 6.25 t/ha+LCC based N management (S2), LCC based N management alone (S3) and recommended dose of fertilizer (75.0: 37.5: 37.5 kg/ha of N, P2O5and K20) (S4) constituted the sub-plot treatments. The variety Jeeraga Samba (V1) recorded significantly higher plant height (69.2, 119.1 and 129.7 cm), LAI (2.72, 5.84 and 5.62) and DMP (861.3, 1738 and 12517 kg/ha) at tillering, panicle initiation and at harvest, respectively. Among the nutrient management treatments, application of green manure @ 6.25 t/ha along with 50% recommended dose of fertilizer (S1) recorded significantly higher plant height (69.5, 116.7 and 130.4 cm), LAI (1.67, 4.66 and 5.22) and DMP (836, 1472 and 11658 kg/ha) at tillering, panicle initiation and at harvest, respectively. Higher number of panicles/m2 (471), 1000-grain weight (17.43), ill-filled grains (11.12) and grain yield (3014 kg/ha) were recorded in White Ponni (V3). Among nutrient managements, application of green manure @ 6.25 t/ha+LCC based N management (S2) recorded higher number of panicles/m2 (465), 1000-grain weight (13.88), lowest number of ill-filled grains (9.90) and higher grain yield (3769 kg/ha). From the results, it is evident that application of green manure @ 6.25 t/ha+LCC based N management can be done to increase the yield of low N requiring non-basmati quality cultivar, White Ponni. Source


Ramjegathesh R.,Tamil Nadu Agricultural University | Ebenezar E.G.,Agricultural College and Research Institute TNAU | Muthusamy M.,Agricultural College and Research Institute TNAU
Plant Pathology Journal | Year: 2011

Field experiment was carried out to assess the efficacy of plant oils, plant extracts and antagonistic microorganisms against leaf blight disease of onion caused by Alternaria alternata. Two sprays of neem oil (3%) given on onion plants at the first appearance of the disease and the second on 15 days later recorded significantly the lowest percent disease index (22.22%) and besides increasing the yield. In plant extracts Acorus calamus rhizome extract 10% was significantly reduced the disease incidence (34.78%) followed by Mentha arvensis leaf extract. © 2011 Asian Network for Scientific Information. Source


Bharathi K.,Agricultural College and Research Institute TNAU | Mohanraj A.,Agricultural College and Research Institute TNAU | Rajavel D.S.,Agricultural College and Research Institute TNAU
Pestology | Year: 2011

Field experiment was conducted at Agricultural College and Research Institute (TNAU), Madurai to evaluate the bio efficacy of Chlorantraniliprole 20% SC at the rate of 10,15,20,25 and 30 g a.i./ha against the following pests viz., Fruit fly (Bactrocera sp), Fruit borer (Helicoverpa armigera), Leaf catterpillar (Diaphania indica), Pumpkin beetle (Auiacophora sp) and Leaf miner (Liriomyza trifolii). Chlorantraniliprole 20% SC at the rate of 20, 25 and 30 g a.i/ha was found to be effective in suppressing the pest population compared to the standard checks and control. These three treatments also recorded the lowest fruit damage and higher yield. Source


Ramchander S.,Agricultural College and Research Institute TNAU | Ushakumari R.,Agricultural College and Research Institute TNAU | Arumugam Pillai M.,Agricultural College and Research Institute TNAU
Indian Journal of Agricultural Research | Year: 2015

The present study investigated the effects of gamma rays on crop phenotypes on two quality rice varieties viz., White Ponni and BPT 5204. The germination percentage and pollen fertility was found to be greatly affected by mutagenic treatments of gamma radiation in both the varieties which ultimately exhibited linear reduction with increase in dose or concentration of mutagens. The doses or concentrations can be determined by establishing the LD50 value for the mutagen to be used. The expected LD50 values of gamma radiation for White Ponni and BPT 5204 were 354.80 Gy and 288.40 Gy, respectively. Several plant traits like days to fifty per cent flowering, plant height, panicle length, leaf length, leaf breadth, number of productive tillers, number of grains per panicle, thousand grain weight and single plant yield was found to be greatly reduced due to mutagenic treatments. Based on the overall consideration of M1 effects, the variety White Ponni was found to be highly sensitive to mutagens than BPT 5204. Source


Murali Baskaran R.K.,Agricultural College and Research Institute TNAU | Sasikumar S.,Agricultural College and Research Institute TNAU | Rajavel D.S.,Agricultural College and Research Institute TNAU | Suresh K.,Agricultural College and Research Institute TNAU
Pestology | Year: 2012

Among the chemical pesticides tested against eggs of Paragus serratus (Fab.) Dimethoate 30 EC (1.5 ml/lit.) and Endosulfan 35 EC (2 ml/lit.) were equally toxic to eggs, recording 44.0 and 38.0 per cent egg mortality, respectively, 48 hours after treatment. Out of three methods of treatment, chemical pesticides exposed to maggots of P. serratus through thin film technique was more toxic than topical application and prey contamination techniques and the toxicity to maggots was in the order of Dimethoate> Endosulfan>Malathion>Wettable sulphur. Source

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