Coconut Research Station
Coconut Research Station
Johnson I.,Tamil Nadu Agricultural University |
Ramjegathesh R.,Coconut Research Station |
Sheela J.,Horticultural College and Research Institute |
Shoba N.,Coconut Research Station |
Maheshwarappa H.P.,Project Co ordinator AICRP on Palms
Acta Phytopathologica et Entomologica Hungarica | Year: 2017
The leaf blight disease caused by Lasiodiplodia theobromae is an important foliar disease in coconut that results in a yield reduction of 10-24 per cent in Tamil Nadu, India. In the present study, five Trichoderma viride isolates, Pseudomonas fluorescens and Bacillus subtilis strains were isolated from the coconut rhizosphere and tested against L. theobromae. P. fluorescens Pf1, B. subtilis (Km1) and T. viride (TNAU) isolates were found highly effective against the leaf blight pathogen under in vitro conditions and hence, all the three antagonists were combined together to develop microbial consortia and tested against leaf blight disease under field conditions. Soil application of microbial consortia formulated using talc as a carrier material at 150 g (50 g each) and 300 g (100 g each) doses at different intervals (quarterly, half-yearly and annually) was eval - uated for three years from 2011 to 2013. Among the treatments, the fungicide carbendazim was found to be the most effective against coconut leaf blight. Among the treatments with bioagents, soil application of microbial consortia @ 300 g+5 kg of farm yard manure at quarterly interval/palm/year was the best treatment which was followed by the treatment with TNAU Bacillus subtilis (Bs1) mixture in two locations. Confirmatory results were obtained in similar experiments carried out at two different locations during 2013-2014, too. © 2017 Akadémiai Kiadó, Budapest.
Ragini S.,Tamil Nadu Agricultural University |
Subramanian A.,Coconut Research Station |
Nirmalakumari A.,Center for excellence in millets |
Bapu J.R.K.,Center for Plant Breeding and Genetics
Journal of Crop Improvement | Year: 2015
Presence of genetic diversity is a prerequisite for genetic improvement of any crop. As lodging and associated grain loss is a problem in kodo millet, a study was undertaken to characterize and assess the diversity in kodo millet germplasm accessions for culm strength and grain yield-related traits. Principal component and cluster analyses were performed for grouping the genotypes and to identify the traits that contributed significantly to the diversity in kodo millet. Cluster analysis grouped the genotypes into four main clusters. Cluster I had highest values for most of the traits, except internode length and grain yield. Cluster IV had smallest mean values for all studied traits. The genotypes in Cluster II had highest values for grain yield and test weight. Cluster III was intermediate in performance for most of the traits, hence genotypes in Cluster I could be used for improving culm-related traits and test weight, and those in Cluster II for improving grain yield and test weight and Cluster III for improving earliness. Copyright © Taylor & Francis Group, LLC.
Mohandas S.,Coconut Research Station |
Naveen Saviour M.,Coconut Research Station |
Pandian B.J.,Coconut Research Station
Indian Journal of Agricultural Research | Year: 2015
A field experiment was conducted on rice at farmer's fields to compare the performance of SRI with different N sources. The experiment was conducted in sandy loam soil during rabi 2013-14 with various N sources viz., Urea and Ammonium sulphate and the SRI was compared with various system of rice cultivation viz., conventional method and farmer's own method. The results emanated from the experiment showed that the N application through Ammonium sulphate at 100 % recommended level under SRI, recorded the highest yield attributes of rice viz., number of tillers and productive tillers, number of grains per panicle, 1000 grain weight, total DMP, grain and straw yield. The yield was increased to the tune of 33.4%, 66.0 % over conventional and farmers method respectively.Water productivity was higher under SRI (0.94) overconventional (0.37) and farmer'spractice (0.18).Besides, SRI resulted in 40.5 %and 42.0 % water saving over conventional and farmers practice respectively.In addition, SRI recorded an increased net return of 49.0 % and 74.7% over conventional and farmer's practice respectively.Harvest index was found to be higher under SRI (39.0 %), followed by conventional (35.0 %) and farmer's practice (30.3 %).