【摘要】 针对渭北旱原“旱”、“薄”关键性的产量限制因素，采用再裂区设计，于１９８７～１９８８（干旱年型）和１９８８～１９８９（丰水年型）两个不同降水年度研究了旱地冬小麦耕作、施肥、覆盖因素的增产效应。干旱年型施肥增产显著。耕作、覆盖、覆盖×耕作、覆盖×施肥、覆盖×耕作×施肥互作增产极显著；丰水年型耕作因素间增产显著，施肥及施肥与耕作互作增产极显著。更多还原

【Abstract】 Based on the two key constraints of drought and less-fertilization re- stricting winter wheat yields,the resplit plot design was adopted in two different rainfallyears,e. in 1987～1988(the year of drought type)and in 1988～1989(the year of waterharves)to study wheat yield increase effect in rainfed land by tillage ,fertilization andmulching. The results showed that the effect of fertilization was significant and that oftillage,mulching and mulching× tillage,mulching ×fertilization,mulching ×fertiliza-tion ×tillage were very significant in the year of drought,but the effect oftillage factorwas significant,and that of fertilization,and fertilization× tillagewas extremely signifi-cant in the year of water harvest.更多还原