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Doctoral Thesis
DOI
https://doi.org/10.11606/T.11.2019.tde-20191220-120637
Document
Author
Full name
Janice Guedes de Carvalho
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 1987
Supervisor
Title in Portuguese
Efeito de deficiências minerais na absorção de fósforo pelo arroz (Oryza sativa, L.)
Keywords in Portuguese
ARROZ
DEFICIÊNCIAS MINERAIS DE PLANTAS
FÓSFORO
Abstract in Portuguese
A absorção de fósforo em função da deficiência de macronutrientes em arroz foi o objetivo deste estudo. Foram feitos ensaios de cinética de absorção de 32P em duas variedades de arroz (IAC 164 e IAC 899) submetidas a deficiência incipiente (da germinação até 21 dias) e deficiência acentuada (até o aparecimento do sintoma) de N, P, K, Ca, Mg e S. Foram observadas diferenças significativas na absorção de fósforo pelas duas variedades de arroz, uma se sequeiro e outra irrigada, quando submetidas a dois pré-tratamentos (deficiência incipiente e deficiência acentuada) e depois colocadas em presença de várias concentrações do elemento em questão. A deficiência incipiente causou menor alteração nos parâmetros cinéticos (km e Vmax) que a carência acentuada. A resposta aos pré-tratamentos não foi sempre a mesma segundo as plantas absorviam P fornecido em baixa ou alta concentração
Title in English
The effect of mineral deficiencies on the uptake of phosphorus by rice (Oryza sativa L.)
Abstract in English
The kinetics of uptake of 32P labelled phosphate was studied by using intact rice plants under two pretreatments, namely, incipient and visible deficiency symptoms of N, P, K, Ca, Mg and S. Two cultivars were used, IAC 164, upland and IAC 899, lowland. Significant differences in phosphate uptake by the two varieties were observed. Incipient deficiency caused lower variations in km and Vm than the accentuated one. The response to the pretreatments was influenced by the concentrations of phosphate supplied during the absorption period
 
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Publishing Date
2019-12-20
 
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