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Predicting crop growth and aphid incidence in Brassica under semi-arid environment

Indian Agricultural Research Journals

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Title Predicting crop growth and aphid incidence in Brassica under semi-arid environment
 
Creator KAR, GOURANGA
CHAKRAVARTY, N V K
 
Subject Brassica, intercepted photosynthetically active radiation, infrared/red ratio, normahzed difference, greenness index, brightness index, aphid
 
Description A field experiment was conducted in the sandy loam soils to predict crop growth parameters and aphid incidence inBassica using spectral reflectance and meteorological data. Three Brassica oilseed species, viz 'BO 54'(Brassica napusL.), 'Pusa Bold' Indian mustard (Brassica juncea L.) and 'T 9' toria (Brassica campestris L.) were sown on three datesat 14-day intervals starting from third week of October to create different photo-thermal environments during cropgrowth period. The intercepted photosynthetically active radiation and 4 spectral indices, viz (Infra red / red ratio, normalizeddifference, greenness index and brlghtness index) were derived to correlate plant growth parameters with these indices.The intercepted photosynthetically active radiation was found to be. well correlated with biomass with thecorrelation coefficient varying from 0.71 to 0.92 in different cultivars and sowing dates. It was found from correlationstudy among different spectral and plant growth. paratmeters that there was strong relationship (at 5%  level of significance)between infra red / red ratio, normalized difference and leaf area indexfor all  the 3 Brassica cultivars. On the other hand,the brightness and greenness indices were more closely correlated (at 50% level of significance )with above ground biomassas compared to infrared/red ratio and normalized difference. Model regression equations were also derived to forecastaphid incidence in Brassica with most significant Weather variables. The aphid populations were found to be correlatedwith maximum temperature, minimum temperature £tnd afternoon relative humidity with the correlation coefficientsvarying from 0,67 to 0.90 for different cultlvars and sowing dates.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2013-03-04
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/27853
 
Source The Indian Journal of Agricultural Sciences; Vol 70, No 1 (2000)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/27853/12639
 
Rights Copyright (c) 2014 The Indian Journal of Agricultural Sciences