MATERIALS AND METHODS
The experiment was conducted at the Regional Agricultural Research and Development Centre, Makandura, Sri Lanka from January to July 2009. The site belongs to Law Country Intermediate Zone of Sri Lanka where the average day and night temperatures are 31.9 ºC and 22.4 ºC respectively with an annual rainfall of more than 1,400 mm. Two types of growing media were prepared using paddy straw and cotton waste. Both growing media were tested in indoor and outdoor (existing method) systems. Cost was also calculated for each treatment