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Responce of Some Tanzanian Rice Genotypes Under Salty Soil Conditions: Performance of rice genotypes and evaluation of traits fo,Used
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Many efforts have been made elsewhere to improve cultivated rice varieties for salttolerance. In Tanzania, such improvement has never been done though the cultivated land is increasingly dwindling due current environmental changes which increase the effects of salt affected soils in irrigared rice. Most farmers use either improved or local rice varieties regardless of the soil salt status. Varieties grown have never been tested or improved for salt tolerance. Studies found that significant variations in phenology, morphology and physiology across salty environments have also been observed among genotypes. When large differences exist between target environments, a distinct set of genes would be required for specific adaptation . Thus, cultivars selected in nonstressed environments may not necessarily be suited for stress environments. Experience also revealed that, introduction of high yielding varieties from nonstress soils into problem soils, with the aim of increasing production, has not only resulted in yield failure, but also disappointment among farmers. This study therefore established performance of some Tanzania rice genotypes under saline and salinesodic conditions
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