study of the effect of sulfuric acid, temperature scales and the source of seed on to break hardness alfalfa seed (medicago scutellata cv robinson)

an experiment was conducted to study the effect of sulfuric acid, temperature scales and the source of seed on to break hardness alfalfa seed (medicagoscutellatacvrobinson). this study was carried out as a factorial experiment based on randomized complete design with four replications at the agricultural collage of lorestan university in 2005. acid treatment as the first factor (to rinse with acid and without rinsing) and temperature scales treatment as the second factor (5, 15, 30, 45 centigrade degree) and the source of seed as the third factor (khoramabad and karaj) were applied. the results showed that to rinse seed with sulfuric acid to break hardness alfalfa seed. seed hardness was not significantly affected by exposing in fixed temperature, but germination percentage decreased in 45 centigrade degree treatment. radicle length increased under temperatures around base temperature. seed hardness was affected by soil texture type, so that the highest germination percentage was obtained from sandy soil.