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Growth and flowering of cacao under controlled atmospheric relatives humidities

by Sale, P.J.M.
Publisher: 1970Description: 8 p.Subject(s): ETAPAS DE DESARROLLO DE LA PLANTA | THEOBROMA CACAO | CLONES | FLORACION | HUMEDAD RELATIVA | BROTACION | TRANSPIRACION | PLANT DEVELOPMENTAL STAGES | THEOBROMA CACAO | CLONES | FLOWERING | RELATIVE HUMIDITY | SPROUTING | TRANSPIRATION | STADE DE DEVELOPPEMENT VEGETAL | THEOBROMA CACAO | CLONE | FLORAISON | HUMIDITE RELATIVE | POUSSEE | TRANSPIRATIONOnline Resources: En In: Journal of Horticultural Science (RU) v. 45(2) p. 119-132Summary: Young clonal cacao trees have been grown for 390 days in controlled environment rooms, either continuously at relative humidity levels of 50-60 per cent (low), 70-80 per cent (medium) or 90-95 per cent (high), or alternated between any two of these levels at 109-day intervals. The temperature was 80 more or less 1 fahrenheit grade (26.7 centigrade grade) throughout, and the plants were watered frequently to keep the soil near to field capacity. Plants at the low humidity flushed before the others, but thereafter the period between flushes was rather longer at low and medium than at high humidity. There was little difference in numbers of leaves expanded, but the area of each expanded leaf was consistently least during periods of high humidity and, overall, greatest during periods of low humidity. Leaf weight per unit area was greatest at high humidity. Total dry weight increase per plant was greatest under alternating humidities, particularly when one of the periods was a high humidity. At constant high humidity both net leaf area and total dry weight were least of all. Stem length was significantly greater at high humidity than at low. Flowering was good in all treatments and usually particularly profuse following the transfer of plants from a low or medium to a high humidity
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Ilus. 3 tab. 15 ref. Sum. (En)

Young clonal cacao trees have been grown for 390 days in controlled environment rooms, either continuously at relative humidity levels of 50-60 per cent (low), 70-80 per cent (medium) or 90-95 per cent (high), or alternated between any two of these levels at 109-day intervals. The temperature was 80 more or less 1 fahrenheit grade (26.7 centigrade grade) throughout, and the plants were watered frequently to keep the soil near to field capacity. Plants at the low humidity flushed before the others, but thereafter the period between flushes was rather longer at low and medium than at high humidity. There was little difference in numbers of leaves expanded, but the area of each expanded leaf was consistently least during periods of high humidity and, overall, greatest during periods of low humidity. Leaf weight per unit area was greatest at high humidity. Total dry weight increase per plant was greatest under alternating humidities, particularly when one of the periods was a high humidity. At constant high humidity both net leaf area and total dry weight were least of all. Stem length was significantly greater at high humidity than at low. Flowering was good in all treatments and usually particularly profuse following the transfer of plants from a low or medium to a high humidity

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