PRODUCTION OF EIGHT CROPPING SYSTEMS ON SALINE AND GLEYSOLIC ALLUVIUM SOIL, THE PAS, MANITOBA
[摘要] In1961,eightcroprotationswereestablishedonarecentlydrainedalluviumsoil(5 hainsize).Withintherotationstripstheaverageinitialelectricalconductivity(ECe)ofthe0–30-cmdepthrangedfrom0.3to28.6 mmhos/cm.Threerotationscontainedonlywheat(withvariousamountsofsummerfallow),threecontainedonlyforagecrops(alfalfaorbromegrassorboth),andtwocontainedbothwheatandforagecrops(cloverorbrome–alfalfa).From1961to1969thewheat–cloverandcontinuousalfalfarotationsgavethebestyields,thusgivingthehighestnetreturnsindollars.In1969,betteryieldsofwheatwereobtainedaftertheforagecroprotationsthanafterthegrainrotations.Groundwaterlevelsandsubsurfacesoilsalinityremainedrelativelyconstantthroughoutthestudy.
[发布日期] [发布机构]
[效力级别] [学科分类] 农业科学（综合）
[关键词] [时效性]
