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Previous issue date: 2015 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (Capes) === A adi??o de ?cido c?trico ao substrato pode influenciar a disponibilidade de f?sforo para as
plantas de caf? e possibilitar melhor crescimento e nutri??o. Al?m disso, o crescimento e a
nutri??o possivelmente sofrer?o influencia da cultivar e do parcelamento de dose do ?cido
c?trico. Por isso, objetivou-se avaliar o crescimento e ac?mulo de nutrientes por mudas de
caf? (Coffea arabicaL.) de tr?s cultivares: Catua? Vermelho IAC 99, Mundo Novo IAC 379-
19 e Oeiras MG 6851, em substrato tratado com ?cido c?trico e diferentes doses de P2O5.
Buscou-se tamb?m verificar o efeito do parcelamento do ?cido c?trico no crescimento e
ac?mulo de nutrientes, pelas mudas. Foram instalados dois experimentos, delineados em
cinco blocos e esquema fatorial. No primeiro, foram avaliadas as tr?s cultuvares de caf? e
quatro doses de P2O5 (0, 450, 900 e 1.800 g m-3) em solo tratato com ?cido c?trico anidro (0,5
mg dm3). No segundo experimento, os fatores foram compostos pelas quatro doses de P2O5 e
a dosagem de ?cido c?trico dividida em quatro parcelamentos. As plantas foram submetidas
aos tratamentos a partir da emiss?o das primeiras folhas cotiledonares as avalia??es ocorreram
ap?s 180 dias (no primeiro experimento) e ap?s 120 dias (no segundo experimento). Foram
avaliadas vari?veis de crescimento, ac?mulo de mat?ria seca e nutrientes pelas plantas de
caf?. Como resultados verificou-se que as doses de P2O5, em substrato tratado com ?cido
c?trico, influenciaram o crescimento das mudas de caf? das cultivares estudadas. O maior
crescimento, ac?mulo de biomassa e ac?mulo m?ximo de nutrientes foram na dose de 900 g
m-3 de P2O5. Com rela??o ao parcelamento do ?cido c?trico, foi observado melhor crescimento
de mudas de caf? quando a dosagem foi parcelada em tr?s e quatro vezes. === Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2015. === The addition of citric acid to the substrate can influence the availability of phosphorus for
plants and coffee allow better growth and nutrition. Additionally, the growth and nutrition
possibly suffer influence of genotype and citric acid dose installment. Therefore, this study
aimed to evaluate the growth and accumulation of nutrients in coffee seedlings (Coffea
arabicaL.) Of three cultivars Catua? Vermelho IAC 99, Mundo Novo IAC 379-19 and Oeiras
MG 6851, in substrate treated with citric acid and different of P2O5. It also sought to
determine the effect of citric acid installment in the growth and accumulation of nutrients by
the plants. Two experiments, outlined in five blocks and a factorial design were installed. At
first, they evaluated the three coffee cultuvares P2O5 four doses (0, 450, 900 and 1800 g m-3)
tratato soil with anhydrous citric acid (0,5 mg dm-3). In the second experiment, the factors
were composed by four doses of P2O5 and citric acid dosage divided into four installments.
The plants were subjected to treatment from the issuance of the first cotyledon leaves the
evaluations occurred after 180 days (the first experiment) and 120 days (the second
experiment). Growth variables were evaluated, dry matter accumulation and nutrients by
coffee plants. As a result it was found that doses of P2O5, substrate treated with citric acid,
influenced the growth of coffee seedlings of cultivars. The greatest growth, biomass
accumulation and maximum nutrient accumulation were at a dose of 900 g m-3 of P2O5.
Regarding the installment of citric acid, better growth of coffee seedlings was observed when
the dosage was split into three four times.
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