3.Seeding at proper time适时播种V2-344 timed to coincide with adequate rainfall and moderate temperatures ●spring advantages often more dependable moisture near optimum germination temperatures less risk of frost (legumes) .late summer/autumn advantages -fewer weed problems drier soils more workable 2010­3­22  16 Copyright reseved by Long Mingxiu  3.Seeding at proper time 适时播种V2­344 •timed to coincide with adequate rainfall and  moderate temperatures • spring advantages ß often more dependable moisture  ß near optimum germination temperatures ß less risk of frost (legumes) •late summer / autumn advantages ß fewer weed problems ß drier soils more workable