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Book of Abstracts

11th IFOAM
Scientific Conference
11-15 August 1996
Copenhagen, Denmark

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Yield, quality and post-harvesting conservation of carrots S23

Piamonte Peqa, Reni.

Biodynamic Institute of Rural Development, Botucatu - S.P. Brazil, C.P.321 18603-970

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The objective of the present study was to evaluate the effect of chemical,organic and biodynamic fertilisation on yield, quality and post-harvesting conservation of carrots. The experiment was carried out in the Experimental Farm of the Faculty of Agronomy (FCA/UNESP), in Sco Manuel/Brazil, between May and September 1993. A randomised block experimental design was used with six treatments and four replications. Treatments were A) NPK = N, P, K(100 gr./m2 4-14-8), B) NPK+MICRO = N, P, K plus micronutrients, (100gr./m2 4-14-8 + 5 gr. Yogue), C) NPK+EST N, P, K (50 gr./m2) plus cattle manure (2 kg/m2), D) EST cattle manure (4 kg/m2), E) COMP compost (4kg/m2), F) COMP+BIO compost (4 kg/m2) plus biodynamic preparations (4ppm/ha). The following characteristics were analysed at the end of the experiment: yield, total weight, dry-matter, total weight of leaves, number of roots per kg, average length of roots, average diameter of roots, quality characteristics, Brix (%), tissues texture, average contents of alpha and beta carotene, vitamin A, and characteristics related to post-harvesting conservation 5 and 10 days in normal environmental conditions, and 30 to 65 days in cold camera 120C. All treatments had significant differences affecting carrots yield and dry-matter production.Highest dry-matter content was obtained in treatment D (using cattle manure). On the other hand, treatments had no significant differences affecting the weight of roots and leaves, number of roots/kg or size of roots. Quality was affected considering texture, b-carotene and vitamin A.Treatments F, D and E, showed better results. Significant differences within treatments for texture were observed obtaining highest values with organic fertilisation treatments. Vitamin A and b-carotene contents were significantly higher in treatment F (using compost plus biodynamics preparations). Treatments significantly affected post-harvesting conservation. Durability of carrots grown in treatments with chemical fertilisation maintained at environmental conditions during 5 to 10 days was lower. Similar results were obtained under refrigeration. Treatment F had better performance.

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Rodrigues, D. B. Os Carotensides como precursores de vitamina A. Bot. Soc. Bras. Tecnol., Campinas v.19,p.227-42, 1985.

Schulz, D. Ertrag und qualiät von möhren in abhängigkeit von exposition, dünung und biologish-dynamischen präparaten in einer hügelbeet-versuchsanlage. Bonn, 1990. 102p. (Dissert, Diplom. Agr. Eng.) Rheinischen Friedrich-Wihelms Universitet.