Breaking seed dormancy in different leguminous forage species

abonos verdes acide sulfurique arena clitoria ternatea crotalaria juncea cultivo de temporal culture pluviale desmanthus virgatus dormance dormancy engrais vert filipinas graine green manures lowland macroptilium atropurpureum matorral oryza sativa philippines rainfed farming sable sand scrub seed treatment seeds semilla sulphuric acid tierras bajas traitement des semences tratamiento de semillas