Performance analysis of tropical cabbage (brassica oleracea var capitata L.) hybrids under open and protected conditions
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Date
2011
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College of Horticulture, Vellanikkara
Abstract
The present study entitled “Performance analysis of tropical cabbage (Brassica oleracea L. var capitata) hybrids under open and protected conditions.” was undertaken in the Department of Olericulture, College of Horticulture, Vellanikkara during 2010- 2011. The objectives of the study were to identify an ideal hybrid of tropical cabbage for plains and also to study the feasibility of cabbage cultivation in protected and open field conditions during on and off- seasons. The experiment was laid out in a Randomised Block Design with four replications. Four F1 hybrids namely NS 183, NS 43, NS 35 (Namdhari Seeds Pvt. Ltd.) and Disha (Seminis India Ltd.) were used for the study during off- season (July- Oct) and on- season (Oct- Jan). Protected condition was provided using a rain shelter of 100m2 floor area. Observations on growth and yield attributes were recorded during the course of investigation. The daily weather parameters recorded inside and outside the polyhouse were used to compute the crop weather relationship Non wrapping leaves were less inside polyhouse during both seasons. During off- season maximum plant spread was observed inside the rain shelter for the hybrid NS 43 (48.20cm) which was on par with the other varieties and during on- season, inside the rain shelter plant spread was more in NS 35 (65.41cm) which was on par with NS 43 (61.91cm). NS 35 recorded maximum plant spread in open field (67.66cm) followed by NS 43 (59.25cm). NS 43 was the earliest to achieve 50% head formation during both seasons and growing conditions. It also recorded 50% maturity during both seasons inside polyhouse. During on- season, NS 183 was to mature early in open field. During off- season fifty percent head formation was not observed in open field in any of the hybrids. Net head weight was maximum for NS 43 inside polyhouse (off- season) and during on- season it was maximum for NS 35 under both growing conditions. Head shape of all the hybrids except NS 43 was found to be conical during off- season inside rain shelter. But NS 43 formed drum head shaped heads. NS 183, NS 35 and Disha formed round shaped heads under both growing conditions while NS 43 formed drum head shaped heads during on- season. During off- season, inside the rain shelter maximum head length was observed for the hybrid Disha (14.26cm) and it was on par with NS 183 (13.93cm).Disha recorded maximum head length inside the rain shelter during on- season also (16.25cm) and it was on par with NS 183 (15.91cm) and NS 35 (15.54cm). Core length inside the rain shelter during on- season was minimum for NS 43 (7.87cm) and it was on par with NS 183 (8.79cm) and NS 35 (7.87cm). During off- season, inside the rain shelter harvest index was found to be maximum for NS 43 (67.70) which was on par with NS 183 (60.46). Pest and disease incidence was more in open field crop during both seasons. The daily weather parameters recorded inside and outside the polyhouse were used to compute the crop weather relationship. There was significant correlation between the weather parameters and characters like days to fifty percent head formation and days to fifty percent head maturity. Benefit –cost ratio was maximum for open field crop (2.66) during on- season. It can be concluded that NS 43 is ideal for protected cultivation during off- season, while NS 35 is suitable for on- season cultivation under both growing conditions. Further, off- season cultivation of cabbage in rain shelter offer much scope for self employment generation for the unemployed youth.
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