02391naa a2200325 a 450000100080000000500110000800800410001902400410006010000230010124500970012426000090022152014210023065000330165165000230168465000120170765000220171965000100174165000240175165000210177565000090179665300120180565300280181770000200184570000230186570000220188870000240191070000220193470000230195677300860197920199272018-08-28       2015    bl uuuu     u00u1 u    #d7 a10.1590/S0100-204X20150007000012DOI1 aSILVA, T. G. F. da  aSoil water dynamics and evapotranspiration of forage cactus clones under rainfed conditions.  c2015  aThe objective of this work was to evaluate soil water dynamics in areas cultivated with forage cactus clones and to determine how environmental conditions and crop growth affect evapotranspiration. The study was conducted in the municipality of Serra Talhada, in the state of Pernambuco, Brazil. Crop growth was monitored through changes in the cladode area index (CAI) and through the soil cover fraction, calculated at the end of the cycle. Real evapotranspiration (ET) of the three evaluated clones was obtained as the residual term in the soil water balance method. No difference was observed between soil water balance components, even though the evaluated clones were of different genus and had different CAI increments. Accumulated ET was of 1,173 mm during the 499 days of the experiment, resulting in daily average of 2.35 mm. The CAI increases the water consumption of the Orelha de Elefante Mexicana clone. In dry conditions, the water consumption of the Miúda clone responds more slowly to variation in soil water availability. The lower evolution of the CAI of the IPA Sertânia clone, during the rainy season, leads to a higher contribution of the evaporation component in ET. The atmospheric demand controls the ET of clones only when there is higher soil water availability; in this condition, the water consumption of the Miúda clone decreases more rapidly with the increase of atmospheric demand.  aCrassulacean acid metabolism  aEvapotranspiration  aOpuntia  aBalanço hídrico  aClone  aEvapotranspiração  aPalma forrageira  aSolo  aNopalea  aVia fotossintética MAC1 aPRIMO, J. T. A.1 aMOURA, M. S. B. de1 aSILVA, S. M. S. e1 aMORAIS, J. E. F. de1 aPEREIRA, P. de C.1 aSOUZA, C. A. A. de  tPesquisa Agropecuária Brasileira, Brasíliagv. 50, n. 7, p. 515-525, jul. 2015.