Alternative treatments for the conservation of castor seeds (Ricinus communis L.)

ABSTRACT The aim of this study was to evaluate the effects of alternative treatments and storage environment on the physiological and sanitary qualities of castor seeds. Treatments were: derosal, vitavax-thiram, sodium benzoate, potassium sorbate, trichodermil SP, rosemary, garlic, cinnamon, Indian clove and control treatment. The seeds were subjected to storage in laboratory and in a cold chamber for 12 months. Castor seeds chemically treated with derosal and vitavax-thiram showed physiological and sanitary quality superior to those of seeds treated with alternative products and without treatment at 12 months of storage. Castor seeds stored in laboratory, for a period longer than 8 months, must be treated with traditional chemical fungicides. If the seeds are stored in a cold chamber, the maintenance of their germination and vigor above 80% does not depend on the used fungicide treatment. The most promising alternative fungicides were trichodermil, potassium sorbate and garlic, especially the first product.