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1、800-476-6861|www.sedl.org/connectingkidsCopyright 2012 by SEDL.All rights reserved.800-476-6861|www.sedl.org/connectingkidsCopyright 2012 by SEDL.All rights reserved.800-476-6861|www.sedl.org/connectingkidsCopyright 2012 by SEDL.All rights reserved.Student Example:Planting a GardenBy The Connected K
2、idsProblemWe wanted to plant a garden at school.The principal gave us an area like this for the project.(Measures of the sides are in meters.)2The Problem With WeedsOne of the first things we needed to do was to get rid of all of the weeds before planting.Questions:What should we use to get rid of t
3、he weeds?How much of this material will we need?3Photo:SEDL.Weed ControlLandscape FabricLandscape FabricChemicalsChemicalsNewspaperNewspaper 4Photos:SEDL.Weed ControlPull by HandPull by HandBurlapBurlap 5Photos:SEDL.Weed Control Pros&ConsTypeBenefitsDrawbacksPull WeedsCheapWould take a long timeChem
4、icalsKills weeds fast Not allowed in schoolLandscape fabricWorks a long timeBurlapWorks a long timeNewspaperCheap 6Experiment to Find the BestTypeBenefitsDrawbacksLandscape fabricWorks a long timeBurlapWorks a long timeNewspaperCheap 7Experiment to Find the BestQuestions:How much will we need?Landsc
5、ape fabricBurlapNewspaper 8Determining Necessary Information We must subdivide theplot into four smaller plots.Also,to determine the amount of each materialthat is needed,we must determine the area ofeach subdivision.9Determining Necessary Information 10Determining Necessary Information 11One Possib
6、le Subdivision:Step 112One Possible Subdivision:Step 213One Possible Subdivision:Step 314Experiment to Find the BestProcedure:1.Cover three areas each with one method of weed control.2.Plant the same vegetables in the three areas.3.Leave one area untouched;this area is our control.4.Water once a week.5.Once a week,take pictures and count weeds.6.Log the results in the lab log.15To Be ContinuedWater the garden as needed.Once a week:Log the observations.Take pictures to document the observations.After 3 months,report the results and develop a conclusion from the weed-control experiment.16