National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A survey was conducted during 2017-18 to study the leaf nutrient norms using Diagnosis and Recommendation Integrated System (DRIS) for Byadgi chilli crop in three district of north Karnataka. A total of 175 locations were selected and index chilli leaf samples were collected at peak flowering stage. These samples were analysed for nutrients to establish the data bank. The whole population of study area was divided into low and high yielding categories taking chilli yield of 8.50 q/ha as cut off level. Totally 28 nutrient expressions were selected as diagnostic norms that have direct relationship with chilli yield. These expressions had high variance and low co-efficient of variation (CV) that was found to have greater diagnostic precision. Few selected expressions were N/P (6.55), N/K (0.81), N/Ca (1.91), Mg/N (0.21), N/S (5.85), Fe/N (21.57), N/Zn (0.10) etc. The nutritional imbalance index indicated an overall imbalance of the nutrients based on sum of the indices irrespective of sign. The identification of nutrients imbalance through DRIS indices indicated potassium as the most yield limiting followed by sulphur, magnesium and phosphorus. Further nutrients ranges were derived using mean and standard deviation as low, deficient, optimum, high and excess for each nutrient to serve as a diagnostic tool for yield. The optimum concentrations of N, P, K, Ca, Mg, S, Fe and Zn in index leaf ranged from -2.74 to 3.14, 0.54-0.71, 3.86-4.74, 2.27-2.94, 0.93-1.19, 0.44-0.51 per cent, 75.30-92.37 and 28.28-30.15 mg/kg respectively.
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