土壤酸度和pH值——土壤肥力的基础.pdf

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1、Soil acidity and pH the foundation of soil fertilityMiles DyckFaculty of Agriculture,Life and Environmental SciencesExploring the agronomic and soil health benefits of liming in the PrairiesAcknowledgements Dr.Linda Gorim(WGRF Research Chair)PhD students:Jedida Chirchir,Priscillar Wenyika Technician

2、s:Salvador Lopez Benites,Karanjot Gill Dick Puurveen,Manager at Breton for 25 years Jim Robertson(emeritus professor)Breton Plots Management Team Breton Plots Donors Funders:RDAR,Western Grains Research Foundation,Mitacs,Shell Canada,Fertilizer Canada,International Plant Nutrition Institute,ACIDF,Al

3、berta Wheat Commission,NSERCFaculty of Agriculture,Life and Environmental SciencesExploring the agronomic and soil health benefits of liming in the PrairiesSoil Acidity and pH pH describes soil acidity soil pH is a measurement of the activity(concentration)of hydrogen ions in a soil extract or satur

4、ated paste pH has a logarithmic scale.A 1 unit change in pH 10-fold change in hydrogen ion activityhttps:/openpress.usask.ca/soilscience/pH5.5 6.06.0 6.56.5 7.07.0 7.57.5 8.0 Parent material(clay,carbonates,pyrite,bedrock)Organic Matter(soil zone)Soil Type(Luvisolic,Chernozemic,Solonetzic)5.55.5-6.1

5、DayslandPlain Ecodistrictaverage soil pH(0-6)for Daysland Plain Ecodistrictyear1962-19691976-19821993-19972015-2022pH5.05.25.45.65.86.06.26.41962-1969:4009 samples1976-1982:2110 samples1993-1997:5803 samples2015-2022:1839 samplesOptimum pH for some Prairie Crops 4.55.05.56.06.57.0wheat,canola,barley

6、,cornpulse cropssugar beetsalfalfaoats,timothy,creeping red fescueSoil pH measurementExchangeable AciditySoil SolutionActive Aciditysoilextract/pastepHis lime required?how much lime?Exchangeable vs Solution Acidityhttps:/content.ces.ncsu.edu/soil-acidity-and-liming-for-agricultural-soilsProcess of s