Relacoes entre transpiracao maxima, evapotranspiracao de referencia e area foliar em quatro variedades de mangueira.

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From: Revista Brasileira de Fruticultura(Vol. 31, Issue 1)
Publisher: Sociedade Brasileira de Fruticultura
Document Type: Article
Length: 3,498 words

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Abstract :

Nas condicoes edafoclimaticas de Cruz da Almas--BA, na Embrapa Mandioca e Fruticultura Tropical, foi realizado um estudo no qual se relacionou a transpiracao maxima (Litros [m.sup.-2] folha/[dia.sup.-1]) de quatro variedades de mangueira (Tommy Atkins, Palmer, Haden e Van Dyke, com areas foliares totais de 14; 8; 33 e 12 [m.sup.2], respectivamente) com a evapotranspiracao de referencia (ETo). A transpiracao das plantas (L [m.sup.2]) foi estimada por meio de sensores que realizam o balanco de calor no caule (modelos SAG13; SGB9; SGB16; SGB19 e SGB25, Dynamax Inc.) dispostos nos sentirte (N), sul (S), leste (E), oeste (W) e centro (C) de cada planta. A transpiracao por unidade de area foliar (L [m.sup.-2] folha [dia.sup.-1]) variou em media de 1,58 ao longo do periodo estudado, e linearmente com o aumento da area foliar total data, independentemente da variedade estudada. A transpiracao (Litros [m.sup.-2] folha/[dia.sup.-1]) variou de 0,36 a 3,00, dependendo da demanda atmosferica. A transpiracao maxima (T) das quatro variedades de mangueira (Litro]) relacionouse linearmente com a ETo (T = 0,44.ETo; [r.sup.2] = 0,78), sendo um excelente subsidio para o manejo de irrigacao por gotejamento nesta cultura. Termos de indexacao: manga, fluxo de seiva, uso de agua. A study relating maximum transpiration (L [m.sup.-2] leaf [day.sup-1]) to reference evapotranspiration (ETo) for four mango cultivars (Tommy Atkins, Palmer, Haden and Van Dyke, with 14 [m.sup.2], 8 [m.sup.2], 33 [m.sup.2] and 12 [m.sup.2] of leaf area, respectively) was carried out at Embrapa Cassava and Tropical Fruits, in the conditions of Cruz da Almas-BA. Plant transpiration (L. day-1) was estimated by heat balance sensors that were installed on the shoots (models SAG13; SGB9; SGB16; S Dynamax Inc.). The sensors were installed to the North (N), South (S), East (E), West (W) and Center(C) of each plant. The transpiration per unity leaf area (L.[m.sup.-2].day-1) varied about 1.58 in average along the studied period and it also varied linearly with the increase in total leaf area, regardless the studied variety. Transpiration (Liters [m.sup.-2] leaf area [day.sup-1]) varied from 0.36 to 3.00, according to the atmospheric demand. The maximum transpiration (T) of the four Liters [m.sup.-2] leaf area day [day.sup-1]) linearly related to ETo (T = 0.44.ETo; [r.sup.2] = 0.78), performing as a reasonable tool for mango crop drip irrigation management. Index terms: mango, sap flow, water use.

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Gale Document Number: GALE|A212210915