Long-term land quality studies on a toposequellce, presenting a continuum of edaphic and hydrologic conditions from dry land to hydromorphic valley bottom opened interesting possibilities for sequential testing of drought tolerance of rice varieties.Variations in the soil nitrogen cycle according to the location in the toposequence may be used for further fundamental and applied research.The phenomena of iron deficiency in tile higher part of this specific toposequence and of iron and/or managanese toxicity in the lower part can be used in screening varieties resistant or tolerant to iron deficiency and to iron and/or manganese toxicity.A very close relationship was found between tile occurrence and severity of blast (Pyricularla oryzae) and the dynamics of the moisture status of the soil; tile rice on the upland part was severely affected after drought stress. Blast affected some varieties much more than others in the dry land part of the toposequence. The principles of sequential testing are also valid for other crops on which research is. now proceeding. Sequential testing of crops can be used for other conditions where one or several environmental parameters change over short distances.
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