Patel, N. M.Patel, R. R.2018-07-112018-07-111987http://krishikosh.egranth.ac.in/handle/1/5810059139Tobacco, the heighest revenue earning commodity among agricultural commodities, occupies hardly 0.3 per cent of the total cropped area of the country. Gujarat ranks second in respect of tobacco hectarage but from productivity view point it is at the first position in India. Chewing tobacco (tabacum type) is grown in about 10,000 ha of Petlad, Borsad and Khambhat talukas of Kheda district of Gujarat State. Practically no information on quantitative genetic aspect is available for chopadiu tobacco grown in Gujarat. Therefore, present investigation was undertaken during the years 1983-84 and 1984-85 at Tobacco Research Station, Dharmaj to (i) study the nature of gene effects govering yield and other agro-morphological characters, (ii) to study the influence of environment on gene effects governing yield and (iii) to evaluate the selected material of each cycle.enAGRICULTURAL STATISTICS, AGRICULTUREA STUDYThesis