Effects of various treatments during the summer months on growth and flower production of common calla
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概要
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1. The experiment which was started in the late spring of 1952 and was continued up to March, 1955, was designed to compare the merits of various practical methods of common calla growing and to determine the effect of cool storage of tubers during summer months on the growth and the cut flower production. 2. Planting in an irrigated field under shade in the summer months immediately after digging brought about favourable performance in the subsequent growth and cut flower production, while the planting in an exposed field without irrigation results in an undesirable crop. 3. When tubers were stored after digging, the storage under low temperature of about 10°C in dry condition till planting in early autumn was the best practice, and the planted out calla demonstrated satisfactory results as was seen in the former case. 4. Either storing under high temperature or storing in the well brought undesirable result for the following growth. 5. The growth of calla was sensitive to the night temperature in winter. When the temperature went down below 5°C, the growth and the cut flower production were cheked in every plot. 6. The flowers were initiated and developed normally under the conditions favorable for vegetive growth. 7. The contents of starch and sugar in the tubers before and after storage were analyzed. Storage under any condition resulted the increase of reducing sugars, especially in the 2-month-cool-storage plot. Non-reducing sugar content increased obviously after cool storage treatment, reaching 7 times after 1 month and 13 times after 2 months as much as that of before storage. The similar increase of non-reducing sugars as in the 2-month-cool-storage plot was observed also in the wellstorage plot. After the storage, the starch content decreased regardless the conditions stored. In the tubers stored in a well the decrease of the starch contents was remarkable and the elongated and etiolated sprouts had emerged while in storage. 8. From the results of this experiment, such practices are recommended that, when the tubers are to be planted in the summer month thorough irrigation and shading are necessary, and in case the tubers are to be placed into storage, it is better to store under the low temperature of about 10°C and not too moist conditions untill early autumn. By the late autumn when the first frost will come, the plants must be protected from low temperature below 5°C at the lowest at night. It is harmful to storing the tubers at high temperature or in a well under wet condition extending over many days.
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