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DOSES DE FOSFORO na fertirrigacao  De MUDAS Em substrato a base de fibra de coco e INFLUENCIA NA PRODUCAO DO REPOLHO Leon cimo¹; joara secchi candian²; lidiane fernandes colombari²; mateus vinicius narciso redigolo²; antonio ismael inacio cardoso² ¹Graduandos do Departamento de Horticultura, Faculdade de Ciencias Agronomicas, Universidade Estadual Paulista, Botucatu-SP, leoncimo@hotmail.com; mvnredigolo@fca.unesp.br ² Mestrandos e Professor do Departamento de Horticultura, Universidade Estadual Paulista, Botucatu-SP, ismaeldh@fca.unesp.br ; joara@live.com ; lidianeliliane@hotmail.com 1 RESUMO O repolho e uma especie propagada por sementes, com producao de mudas em bandeja, porem, existem poucos estudos sobre uso de fertirrigacao com solucoes nutritivas nesta etapa do ciclo das plantas. Nesse sentido, objetivou-se com este trabalho avaliar a influencia de doses de fosforo na fertirrigacao das mudas na producao de repolho usando a fibra de coco. Foram avaliadas seis doses de fosforo (0, 15, 30, 45, 60 e 75 mg L -1 de P) no delineamento em blocos ao acaso. Foram feitas quatro fertirrigacoes aos 7, 14, 21 e 28 dias apos a semeadura. As caracteristicas avaliadas na fase de mudas foram: numero de folhas, altura, massa da materia fresca e seca da parte aerea e das raizes. As caracteristicas avaliadas apos a colheita foram: numero de folhas externas e internas (cabeca), massa da materia fresca das folhas externas e internas, diâmetro e altura da cabeca. Observou-se aumento linear para a altura e massa da materia seca das raizes das mudas quanto maior a dose de fosforo. Ja para o numero de folhas, massa da materia fresca e seca da parte aerea e seca das raizes foi observado efeito quadratico, com maximos valores estimados para doses variando entre 40 e 61 mg L -1 de P. No entanto, nao foram observadas diferencas significativas para todas as caracteristicas avaliadas na colheita, provavelmente porque apos o transplante observou-se bom desenvolvimento das plantas de todos os tratamentos e as diferencas iniciais nao se mantiveram ate o final do ciclo. Palavras-chave: Brassica oleracea var. capitata, adubacao fosfatada, fosfato monoamonico; fibra da casca de coco verde. CIMO, L.; CANDIAN, J. S.; COLOMBARI, L. F.; REDIGOLO, M. V. N.; CARDOSO, A. I. I. DOSES OF PHOSPHORUS USED IN FERTIGATION OF SEEDLINGS AND THEIR INFLUENCE ON CABBAGE PRODUCTION 2 ABSTRACT Cabbage is a species propagated by seeds, with production of seedlings in tray, however, there are few studies on fertigation with nutrient solutions in this stage of the plants’ cycle. The objective of this study was to evaluate the influence of phosphorus doses on fertigation of seedlings in cabbage production. Six doses of phosphorus (0, 15, 30, 45, 60 and 75 mg of P L -1 ) were evaluated in a randomized block design. Four fertigations were made at 7, 14, 21 and 28 days after sowing. The characteristics evaluated in seedling stage were: number of leaves, height, fresh and dry weight of aerial parts and roots. The characteristics evaluated after harvest were: number of external and internal (head) of leaves,  mass of fresh matter of external and internal (“head”) leaves, diameter and height of the “head”. There was a linear increase in the height and dry matter weight of the roots of seedlings the higher is the phosphorus dose. For number of leaves, fresh and dry matter weight of aerial parts and dry weight of root it was obtained quadratic effect, with maximum estimated values for doses ranging from 40 to 61 mg of P L -1 . However, there were no significant differences for all traits evaluated at harvest, probably because after transplantation there was good plant growth in all treatments and the initial differences did not remain until the end of the cycle. Keywords: Brassica oleracea var. capitata; phosphate fertilizer; coconut’s husk fiber

DOSES DE FÓSFORO NA FERTIRRIGAÇÃO DE MUDAS EM SUBSTRATO A BASE DE FIBRA DE COCO E INFLUÊNCIA NA PRODUÇÃO DO REPOLHO