ABSTRACT
The aim of this study was to evaluate braquiarias submitted to two situations of water stress: deficit and flood. The studied forages were: U. humidicola cv. Tully, U. humidicola cv. Llanero, U. brizantha cv. BRS Piatã, U. brizantha cv. Xaraés, U. decumbens cv. Basilisk and U. ruziziensis cv. Kenedy, and the parameters evaluated were related to the structural and morphogenic characteristics. The work was carried out in a greenhouse at the University Unit of Aquidauana. The treatments consisted of different soil moisture conditions: 50 and 80% of the moisture retention capacity of the soil, and slides of 0cm, 1cm and 5cm of water above the soil, with four replications, in a completely randomized design. The model considered the effect of soil moisture for each forage species at 5% of significance. The structural and morphogenic characteristics of grass-tully were not affected by the different water conditions evaluated here. The grass-llanero did not react to flooding. The grass-piatã was tolerant to water deficit conditions and presented adaptation to flooding. The U. decumbens cv. Basilisk presented adaptive responses that improved its tolerance to flooding. The U. ruziziensis cv. Kenedy was unfit for flood and water deficit conditions.
Keywords:
soil flooding; water deficit; soil drenching