Estudos sôbre a alimentação mineral do cafeeiro. II: Absorção do superfosfato radioativo pelo cafeeiro (Coffea arabica L., var. Bourbon Amarelo) em condições de campo

dc.contributor.authorMalavolta, E.
dc.contributor.authorMenard, L. Neptune
dc.contributor.authorLott, W. L.
dc.date.accessioned2023-03-30T10:34:34Z
dc.date.available2023-03-30T10:34:34Z
dc.date.issued1959
dc.description.abstractIn order to find out the best way to supply phosphorus to coffee plants when growing in "terra roxa misturada", a red soil with a high fixing capacity, tagged superphosphate was applied by the following procedures: (1) topdressed in a circular strip around the trees; (2) placed in the bottom of a circular furrow 15 cm deep; (3) placed in a semicircular furrow also 15 cm deep; (4) sprayed directly to the leaves. In each case 150 gms. of ordinary superphosphate tagged with H3 P32 O4 to give 5 X 10(9) c.p.m. were given to the two and half year old coffee plants. It was found that for the several treatments of the total phosphorus in the leaves the following values, on a per cent basis, came from the applied superphosphates: (1) topdressed 10.2 per cent, (2) circular furrow 2.4 per cent, (3) semicircular furrow 1.7 per cent, (4) sprayed 38.0 per cent; one can see, then, that methods (2) and (3) commonly used by the coffee planters are a very inefficient way to supply phosphorus in this type of soil. The remarkable foliar absorption was checked twice: a water culture experiment was carried out, the radiophosphorus being supplied by brushing it in the upper and lower surfaces of a given leaf; radioactivity was detected all over the plant as a result both of absorption and translocation; on the other hand, leaves collected from the sprayed trees were radioautographed; the radioautographs showed the pattern of distribution of the P32 which indicates true absorption rather than a surface contamination. In another locality, an experiment was caried out with 8 year old plants growing in "arenito de Bauru" which is a sandy soil with much less phosphorus fixing capacity. In this experiment the aim was to compare absorption of tagged superphosphate by trees growin under mulch against plants not receiving this treatment, The uptake of phosphorus was the same for both sets of plants. In both field experiments soil samples down to 15 cm in the profile were collected and its 0.2NHC1 soluble phosphorus was counted; rather significant values were observed mainly in the upper 5 cm layers.pt_BR
dc.formatpdfpt_BR
dc.identifier.citationMALAVOLTA, E.; MENARD, L. Neptune; LOTT, W. L. Estudos sôbre a alimentação mineral do cafeeiro. II: Absorção do superfosfato radioativo pelo cafeeiro (Coffea arabica L., var. Bourbon Amarelo) em condições de campo. Anais da Escola Superior de Agricultura Luiz de Queiroz, Piracicaba, v. 16, p.101-111, 1959. Disponível em: https://www.scielo.br/j/aesalq/a/YScTJMVVs73KYDDMvqq9nPS/?lang=pt. Acesso em: 23 jan. 2023.pt_BR
dc.identifier.issn2316-8935
dc.identifier.urihttps://doi.org/10.1590/S0071-12761959000100007pt_BR
dc.identifier.urihttp://www.sbicafe.ufv.br/handle/123456789/13770
dc.language.isopt_BRpt_BR
dc.publisherUniversidade de São Paulo, Escola Superior de Agriculturapt_BR
dc.relation.ispartofseriesAn. Esc. Super. Agric. Luiz de Queiroz;v. 16, p. 101-111, 1959;
dc.rightsOpen Accesspt_BR
dc.subjectCafépt_BR
dc.subjectNutriçãopt_BR
dc.subjectFósforopt_BR
dc.subjectTerra roxapt_BR
dc.subject.classificationCafeicultura::Solos e nutrição do cafeeiropt_BR
dc.titleEstudos sôbre a alimentação mineral do cafeeiro. II: Absorção do superfosfato radioativo pelo cafeeiro (Coffea arabica L., var. Bourbon Amarelo) em condições de campopt_BR
dc.typeArtigopt_BR

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