100%(1)1 out of 1 people found this document helpful
This preview shows page 1 - 5 out of 10 pages.
Lesson 4: Plant Nutrition and DefenseSoilHighly weathered outer layer of the Earth’s crustoMixture of sand, rocks, clay, slit, humus, mineral, and organic matterThe Earth’s crust includes an estimated 92 naturally occurring elementsoMost are found in the form of inorganic compounds calledmineralsPlants Depend on SoilTopsoil othe most organic richoWorms and other creatures love this layerSubsoiloNutrients that have washed off from rocksoLess organicBedrockoWater moves laterally Water and Mineral AvailabilityAbout half of the soil volume is occupied by poresoMay be filled with air or water or bothHydrogen bonds adhere water to soil particles and dissolve nutrientsSoil needs the right balance of sand, silt and clay
Soil composition can determine the relative proportions of air and water in soil spacesSoils with high sand drain quicklySoils with silt do not drain well therefore have little airMost plants like a mixMacro and Microelements Most basicnutrients areelementsLEARNMacro elements: plantnutrients required inrelatively large amountsMicroelements: plantnutrients required inrelatively small amountsChlorine= Cl=ClosedManganese=Mn=MondayMolybdenum=Mo=MorningCopper=Cu=See uZinc=Zn=Zoon
Extracting Nutrients from the SoilMinerals must be in solutionImportant examples:oNitrate: NO3-oPotassium: K+Anions dissolve in soil water and are readily available to plants for uptake by rootsLoss of nutrients by water is called leaching and can have a harmful effect on soil fertility