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1、第28卷第2期河北农业大学学报Vol.28No.22005年3月JOURNALOFAGRICULTURALUNIVERSITYOFHEBEIMar.2005文章编号:1000-1573(2005)02-0094-05基于归一化植被指数的变量施肥控制系统研究1,21231牛哓颖,钱东平,王秀,杨世凤,邵利敏(1.河北农业大学机电工程学院,河北保定071001;2.国家农业信息化工程技术研究中心,北京100089;3.天津科技大学电子信息与自动化学院,天津300222)摘要:研究表明,归一化植被指数(NDVI)可以
2、很好地预测潜在产量和判断当时作物氮的吸收情况并最终预测最优施氮量。本系统是一个集成光学传感和施肥控制装置的实时自动变量施肥系统,它根据实时监测的作物光谱信息和施肥机具的实际前进速度调节施肥量。系统采用无损测试技术和模糊控制算法,实际操作时通过光传感器实时获取归一化植被指数,并使用施氮优化算法(NFOA)计算潜在产量和施氮量,结合施肥机具行进速度调节实施机构中水用电磁阀的开闭,实现实时变量施肥。关键词:归一化植被指数;光传感器;潜在产量;模糊控制;施氮优化算法;实时中图分类号:S03文献标识码:AResearch
3、oncontrolsystemofvariableratefertilizerapplicatorinprecisionagriculturebasedonNDVI1,21231NIUXiao-ying,QIANDong-ping,WANGXiu,YANGSh-ifeng,SHAOL-imin(1.CollegeofMechanicalandElectricalEngineering,AgriculturalUniversityofHebei,Baoding,071001,China;2.NationalEng
4、ineeringResearchCenterforinformationTechnologyinAgriculture,Beijing,100089,China;3.SchoolofElectronicInformationandAutomation,TianjinUniversityofScienceandTechnology,300222,China)Abstract:Thenormalizeddifferencevegetativeindexcanbeavailablyusedinpredictingpo
5、tentialyield,judgingcropabsorptionofNfertilizerofthetimeandfinallydeterminingthemosteffectivequantityofNfertilizer.Thissystemisafertilizerapplicationsystemwithautomaticvaiableswhichintegratedopticalsensingwithapplication,whichadjustsapplyingquantityofNfertil
6、izerbyreal-timemeasuringspectrumdataofcropandthespeedofthetractor.Thesystememploysakindofmeasuringtechnologywithoutdamagingeffectandadoptsfuzzycontrolalgorithm.Itacquiresthereal-timevalueofNormalizedDifferenceVegetativeIndexbyopticalsensors,andaccordinglycal
7、culatespotentialyieldandapplyingquantityofNfertilizerusingNitrogenFertilizerOptimizationAlgorithm,andsimultaneouslyconsidersthespeedofthetractorofthetimetodetermineopenorcloseofelectromagneticvalvestovariablyapplyfertilizerinreal-time.Keywords:normalizeddiff
8、erence;vegetativeindex;opticalsensor;potentialyield;fuzzycontrol;nitrogenfertilizeoptimizationalgorithm;realtime化学肥料可以提高作物的产量得到了世界各地使用化肥,因而造成了肥料的大量流失,这些流失的农民的普遍认可,我国的肥料施用量从1980年到肥料会对环境造成很大的污染。变量
