大豆与玉米轮作的生产概况英

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1、2004CropProductionConsiderationsToddVagtsISUExtensionCropFieldSpecialistToddVagtsTalkingPointsRotationchanges?Corn–SoybeanYieldComparisonsSoybeanYieldPlateau?PestConsiderationsSoybeanCornToddVagtsTheRotationDecision?TraditionalCorn-SoybeanCorn-Corn-S

2、oybeanContinuousCornProblemsandConsiderationsToddVagtsWhyCorn-BeanRotationHigherYields(?)RotationEffect…Lowerfertilizercosts(?)Lesspestproblems(?)Weeds,insects,diseaseLesscropresiduetomanageFarmprogram(?)ToddVagts-10%-7%(1998-01)ToddVagtsCS

3、C(1)

4、C(2)

5、

6、CCCS

7、C(1)

8、C(2)

9、CCToddVagts-9%ToddVagtsToddVagts2ndYearCornPotential7to10percentyieldreductioncomparedto1styearcornAdditional2to4percentyieldreductionwith3ormoreyearsofcornToddVagtsToddVagtsRotationYieldGainsandLosses2ndYearCorn8%YieldreductionX(149b

10、u/A)=11.9bu11.9bu/AX$2.48=$28.56(Disadvantage)Soybeanfollowing2ndYearCorn6%YieldIncreaseX(43.9bu/A)=2.6bu2.6bu/AX$6.04=$15.70(Advantage)ToddVagtsCoststoCorn-on-Corn2ndyearcornand3rdyearsoybeanCornYieldReductionSoybeanYieldGain-$28.56+$15.70=-$12.86To

11、ddVagtsNutrientRequirementsToddVagtsNutrientCostsToddVagtsToddVagtsNutrientfactorsToddVagtsCoststoCorn-on-Corn2ndyearcornand3rdyearsoybeanCornYieldReductionSoybeanYieldGainFertilizerCost-$28.56+$15.70+-$12.00(2years)=-$24.86(2year)ToddVagtsYieldandRo

12、tationYieldbenefittorotationmostevidentinloweryieldenvironments(25%)Yieldbenefitdeclinesunderhighyieldenvironmentsforbothcornandsoybean(15%orless)Corn-SoybeanrotationmaximizescornyieldbutnotsoybeanyieldTheCornSoybeanRotationEffect,JoeLaurerPaulPorter

13、andEdOplinger.UniversityofWisconsin.ToddVagtsCalhounCountySoybeanandCornYieldsComparisonToddVagtsToddVagts5-YearAverageSoybeanYieldToddVagtsToddVagts5YearAverageYieldToddVagtsToddVagtsToddVagtsGreaterAdvantagetoCorn“Highcornyieldsrelativetosoybea

14、nyields”ToddVagtsYieldTrends1971-02IowaCalhounCountyToddVagtsYieldTrend-1997-02IowaCalhounCountyToddVagts6-YearYieldTrendsIowa1997–021987–921977-82ToddVagts6-YearYieldTrendsCalhounCounty1997–021987–921977-82ToddVagtsToddVagtsYieldTrendsforIowa6YearIn