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Efeito da temperatura do solo e suas oscilacoes sobre o crescimento e o acúmulo de nutrientes nas partes aéreas do cafeeiro

by Franco, C.M.
Publisher: Jul-Set 1982Subject(s): COFFEA ARABICA | TEMPERATURA DEL SUELO | ETAPAS DE DESARROLLO DE LA PLANTA | CONTENIDO DE NUTRIENTES | COFFEA ARABICA | SOIL TEMPERATURE | PLANT DEVELOPMENTAL STAGES | COFFEA ARABICA | TEMPERATURE DU SOL | STADE DE DEVELOPPEMENT VEGETAL In: Turrialba (IICA) v. 32(3) p. 249-255Summary: An apparatus was developed to control soil temperatures inside experimental post. The temperature was controlled in such a way as to imitate closely the continuous variation of the temperature of the top layers of the soil in the field during the daily 24 hour period. Starting from a predetermined lower level in the morning, the temperature was increased slowly to a maximum predetermined level just after noon. After staying about two hours at this higher level the temperature decreased slowly until reaching again the morning temperature. This daily cycle was maintained during the experiment. The lower and higher temperatures and the rate of their increase and decrease can be adjusted within wide limits. This equipment was used to study the influence of the soil temperature and its oscillation on the coffee plant growth. The temperature of 33 grade centigrade in the root system, for a period of about two hours daily, resulted in a small decrease in the weight of the aerial parts and a pronounced decrease in the weight of the root system, but did not result in a noticeable decrease in the height of the plants in relation to those kept at a constant 23 grade centigrade. Under similar conditions the maximum temperature of 38 grade centigrade for a period of about two hours caused a pronounced decrease in the height of the plants and in their top and root weight. At the constant temperature of 33 grade centigrade in the root system the height of the plants and the weight of their tops and roots were drastically reduced. There is evidence showing that the reduction of the growth of the coffee plants at the higher temperatures tested is due to a lack of translocation of the absorbed phosphorus from the roots to the aerial parts
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An apparatus was developed to control soil temperatures inside experimental post. The temperature was controlled in such a way as to imitate closely the continuous variation of the temperature of the top layers of the soil in the field during the daily 24 hour period. Starting from a predetermined lower level in the morning, the temperature was increased slowly to a maximum predetermined level just after noon. After staying about two hours at this higher level the temperature decreased slowly until reaching again the morning temperature. This daily cycle was maintained during the experiment. The lower and higher temperatures and the rate of their increase and decrease can be adjusted within wide limits. This equipment was used to study the influence of the soil temperature and its oscillation on the coffee plant growth. The temperature of 33 grade centigrade in the root system, for a period of about two hours daily, resulted in a small decrease in the weight of the aerial parts and a pronounced decrease in the weight of the root system, but did not result in a noticeable decrease in the height of the plants in relation to those kept at a constant 23 grade centigrade. Under similar conditions the maximum temperature of 38 grade centigrade for a period of about two hours caused a pronounced decrease in the height of the plants and in their top and root weight. At the constant temperature of 33 grade centigrade in the root system the height of the plants and the weight of their tops and roots were drastically reduced. There is evidence showing that the reduction of the growth of the coffee plants at the higher temperatures tested is due to a lack of translocation of the absorbed phosphorus from the roots to the aerial parts

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