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- Title
Crescimento vegetativo, resistência estomática, eficiência fotossintética e rendimento do fruto da melancieira em diferentes níveis de água.
- Authors
de Melo, Alberto Soares; Suassuna, Janivan Fernandes; Fernandes, Pedro Dantas; Brito, Marcos Eric Barbosa; Suassuna, Antonio Fernandes; de Oliveira Aguiar Netto, Antenor
- Abstract
Vegetative growth, stomata! resistance, photosynthetic efficiency and yield of watermelon plants under different water levels. It was proposcd to evaluate various hydric schemes on the morphophysiological behavior and performance of watermelon plants at field conditions in the semiarid region of Paraíba state (Brazil). The experiment was carried in the State University of Paraíba. The cultivar Crimson Sweet was used, and plants were spaced 2.2 m x 0.6 m; the experiment was designed in randomized blocks with four treatments [40, 70, 100 and 130% of the reference evapotranspiration value (mm day-1)] and eight replications. The maximum expressions of growth were verified for the irrigation level of 204 mm, with leaf area of 1.831 m², leaf area index of 1.35 m² m-2 and growth rate of 0.04 m² day-1. The stomatal resistance was greater during the afternoon, regardless of irrigation level. The initial, maximum and changing fluorescences and the quantum efficiency of photosystem II reduced abruptly for the highest level of irrigation. The maximum fruit yield (52,400 kg ha-1) was obtained for the irrigation level of 266 mm-1 cycle-1; the water use efficiency verified was 19.69 kg m-3. During the irrigation management for the watermelon plant, it is possible to adopt values between 70-100% for estimating the ETo due to calculate the culture irrigation level.
- Subjects
WATERMELONS; PHOTOSYNTHESIS; AGRICULTURE; WATER supply; GROWTH rate; WATER use; IRRIGATION; AGRONOMY
- Publication
Acta Scientiarum: Agronomy, 2010, Vol 32, Issue 1, p73
- ISSN
1679-9275
- Publication type
Article
- DOI
10.4025/actasciagron.v32i1.2136