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The objectives of the present work were to adjust the method for identifying genetic variability in rice through the use of minimal solution in hydroponic culture, and to identify the most important level and character for the study. The experiment consisted of the response evaluation of 18 rice genotypes to three levels of aluminum treatment. Five variables obtained from root and shoot lengths were evaluated. The data were subjected to the clustering methods of Tocher and nearest neighbor to evaluate the dissimilarity and the most adequate aluminum level. The results indicated that the 2 mg L−1 concentration and the difference between first and second measures of root length were the most useful for evaluating Al tolerance. Based on the results, it was possible to identify tolerant and sensitive cultivars to aluminum.

The oat (Avena sativa L.) crop has been increasing its acreage in Southern Brazil very rapidly in the last decade. Areas novel to the crop, e.g., lowland areas, however, cannot be developed unless flooding-tolerant genotypes are available. With this goal, two experiments were designed using eight commercial genotypes: UPF 14, UPF 16, UFRGS 7, UFRGS 14, UFRGS 16, UFRGS 18, CTC 2 and ORLA 9248. Plants were subjected to flooding for at least 30 days and evaluated for plant height (PH), root length (RL), root dry matter (RDM) and total dry matter (TDM). The genotypes evaluated showed very different responses to flooding.