Evaluation of shade tolerant morphotypes of colocasia
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Date
1992
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Department of Agronomy, College of Horticulture, Vellanikkara
Abstract
The present study 'Evaluationo f shade tolerant morphotypes of colocasia' was conducted during May to December 1990 at the College of Horticulture and Instructional Farm, Vellanikkara, Thrissur, Kerala, India.
Experiment at College of Horticulture was laid out in split plot design with four shade levels in the main plot and six morphotypes in the sub plot. The experiment was carried out with four replications providing 0, 25, 50 and 75 per cent shade. For providing shade, pandals were erected on wooden frames and covered with unplaited coconut fronds on all sides leaving a clearance of 1 m from the ground level. Shade intensities were adjusted using Line quantum and Point quantum sensors.
Experiment at Instructional Farm, Vellanikkara was laid out in randomised block design with four replications. Six morphotypes of colocasia raised under artificial conditions at College of Horticulture, were raised in the interspaces of coconut garden; at the Instructional Farm.
Under artificial conditions, most of the colocasia morphotypes recorded the highest yield at 25 per cent shade and hence this crop is classed as shade loving corp. Though shading had no significant effect on corm yield, cormel yield and harvest index, there was variation in all these parameters among the morphotypes and M recorded the highest value. Morphotypes M„, M,_ and M were ' 2 10 16 selected as better yielders for all shade situations. Starch content of tubers increased with shading whereas oxalic acid content remains unaffected.
Most of the morphotypes evaluated performed similarly under artificial as well as natural shade.
Eleven light infiltration observations from different locations were taken at hourly intervals from 9 am to 5 pm, using Line quantum and point quantum sensors and percentage values were worked out. Mean percentage light infiltration values obtained revealed that there is no consistent relationship between light infiltration and height of the coconut palms or spacing.
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