Abstract
Studies with the ‘Green Goddess’ calla was carried out in a tropical highland area. 35 % shaded potted plants were grown with several types of vermicompost: coffee pulp; coffe pulp + bovine manure; coffee pulp + chicken manure + sugar cane straw. Other treatments were coffee pulp + chemical fertilizer (12(N)-11(P)-18(K)-3 mg) + Organozyma® (natural growth biostimulator). Leaf area, number of emerged shoots, and length of floral peduncle were significantly superior in the plants treated with vermicompost in comparison with those chemically treated with fertilizers and Organozyma®. Flower peduncles from those treated plants were harvested and put in glass flasks, and all treatments were statistically similar in postharvest longevity. In a different study, a harvest index for ‘Green Goddess’ calla was established. When the spathe was open enough to observe the spadix the postharvest longevity was of 37 days without any flower quality decrement. 1717 heat hours of 7 oC were determined since the plants had 15 cm of length until harvest. The maximum, minimum and average all day temperatures per month during the growth period of the crop were 21.1 °C (October), 7.8 °C (December) and 16.6 °C (November), respectively.
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