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Efeito da deficiencia hídrica no solo sobre a renovacao de folhas, floracao e estado de água no cacaueiro

by Machado, R.C.R; Alvim, P. de T.
Publisher: 1981Subject(s): THEOBROMA CACAO | BALANCE HIDRICO DEL SUELO | BROTACION | HOJAS | FLORACION | ETAPAS DE DESARROLLO DE LA PLANTA | THEOBROMA CACAO | SOIL WATER BALANCE | SPROUTING | LEAVES | FLOWERING | PLANT DEVELOPMENTAL STAGES | THEOBROMA CACAO | BILAN HYDRIQUE DU SOL | POUSSEE | FEUILLE | FLORAISON | STADE DE DEVELOPPEMENT VEGETAL In: Revista Theobroma (Brasil) v. 11(3) p. 183-191Summary: The effect of soil water deficiency on leaf water potential, stomatal opening, bark turgidity, flowering intensity and rhythm of leaf flushing was studied in adult cacao growing under greenhouse and field conditions. As expected, water stress developed more rapidly in plants cultivated in containers. Stomatal resistance and leaf water potential in plants under the dry treatment attained values of respectively 18 sec. cm-1 and -19 bars at 12:00 hs. In the field these parameters never reached levels indicative of water deficiency even when the plants were maintained in soils near the wilting point at 30 cm of depth. Flowering intensity was slightly reduced and leaf renewal did not occur in plants grown in the greenhouse under dry conditions. After the plants were rewatered, however, an intense out-of-phase leaf flush (May) occurred in this treatment whereas control plants remained dormant until the period of normal leaf flush in August
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The effect of soil water deficiency on leaf water potential, stomatal opening, bark turgidity, flowering intensity and rhythm of leaf flushing was studied in adult cacao growing under greenhouse and field conditions. As expected, water stress developed more rapidly in plants cultivated in containers. Stomatal resistance and leaf water potential in plants under the dry treatment attained values of respectively 18 sec. cm-1 and -19 bars at 12:00 hs. In the field these parameters never reached levels indicative of water deficiency even when the plants were maintained in soils near the wilting point at 30 cm of depth. Flowering intensity was slightly reduced and leaf renewal did not occur in plants grown in the greenhouse under dry conditions. After the plants were rewatered, however, an intense out-of-phase leaf flush (May) occurred in this treatment whereas control plants remained dormant until the period of normal leaf flush in August

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