CSS302-Lecture4 - 2 = 3-phosphoglycerate (3PGA) (_______...

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Competition vs. Interference
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Physical processes occurring when plants  demand the same growth requirements at  the same time and place for which an  inadequate supply exists. Competition
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Interference The restriction in growth of a plant which arises from association with other plants.
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Impact of a weed on a crop is dependent on: • Competitive ability of the weed • Competitive ability of the crop • Environment
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Factors Affecting Weed Interference       Weed Environment Crop
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Competitive ability of the weed 1. Morphology: - size - height - _____________________ 2. Rate of growth
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Competitive ability of the crop 1a. Morphology: - size - height - _______________________ 1b. Rate of Growth - crops - varieties
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Competitive ability of the crop 2.Crop Management a. ___________________________ b. ____________________________ c. ____________________________
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Environment 1.Soil moisture 2.Temperature 3._______________________________
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C3 vs C4 Plants: C3: ribulose biphosphate (RuDP) + CO
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Unformatted text preview: 2 = 3-phosphoglycerate (3PGA) (_______ water use efficiency) C4: phosphoenolpyruvate (PEP) + CO 2 = malic & aspartic acid (_______ water use efficiency) Density and Duration Factors Affecting Weed Interference Environment Crop (Row Spacing) Weed (Density and Duration) Weed Density Crop Yield Loss (%) Weed Density Crop Yield Loss (%) I Weed Density Crop Yield Loss (%) I A Weed Density Crop Yield Loss (%) I A YL = I N ( ) I + I N A Factors Affecting Weed Interference Environment Crop (Row Spacing) Weed (Density and Duration ) Time of Weed Removal (After Crop Emergence) Crop Yield A Time of Weed Emergence (After Crop Emergence) Crop Yield B Weeds that grow past this point may reduce yield, even if controlled Weeds emerging before this point may reduce crop yield if not controlled Critical Period for Weed Control...
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This note was uploaded on 10/28/2010 for the course CSS CSS302 taught by Professor Jimkells during the Fall '08 term at Michigan State University.

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CSS302-Lecture4 - 2 = 3-phosphoglycerate (3PGA) (_______...

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