RESPONSE OF SUNFLOWER(Helium/ms annuusL.)TO VARYING TW/CPE RATIOS IN SUMMER SEASON

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dc.contributor.advisorPRAVEEN RAO, V.
dc.contributor.authorSRINIVAS, K.
dc.date.accessioned2018-06-04T08:28:29Z
dc.date.available2018-06-04T08:28:29Z
dc.date.issued1998
dc.description.abstractA fieldexperimentwasconductedonsandyloamsoilatCollegefarm,Acharya N.G.RangaAgriculturalUniversity,Rajendranagar,Hyderabadduring 1997—98summer seasontoinvestigatethe“Responseofsunflower(HeliantlzusannuusL.)tovarying IW/CPEratiosinsummerseason”. Thetreatmentsconsistedofdifferentirrigationschedulesbasedonirrigationwater depth (1W) : Cumulative pan evaporation (CPE) ratios viz., 0.6, 0.8, 1.0 and 1.2 throughoutthecr0plifeandtheircombinationsatvegetative andreproductivestages. Besidesthisanirrigationtreatmentbasedonschedulingirrigationsonlyatcriticalgrowth sub periods was included. Thus, constituted twelve treatments were laid out in a randomizedblockdesign withthreereplications. Thetest varietywasMSFH-8. The amountofwaterappliedateachirrigationwasequivalentto50mmdepth(1134litersper plot). Schedulingofirrigationsat 1.0IW/CPE (13)ratiothroughoutcroplife(whichrequired10irrigationsof50mmdeptheachat8daysinterval), 1.2 IW/CPE(L)ratio throughoutcroplife(whichrequired12irrigationsofSOmmdeptheachat6daysinterval) andcombinationof0.6+1.0(16),0.6+1.2(17),0.8+1.002;),0.8—1.2(19),1.0+1.2(110) lW/CPEratios(which required9-12 irrigationsof50mm deptheach withan irrigation interval of6—10days)wereon parand producedsigniticantlx Pig-her 31'.:1:1 itch-:11 lcz1i area/plant drymatteraccumulation/plant,capitulumdiameter totalnumberofseedsper plant,1000-seedweight seedyield/plant oilcontent,seedyield/haandtotaldrymatter/"ha incomparisonto0.6IIW/CPE(1;)ratiothroughoutthecroplife,0.8IW/CPE(1;)ratio throughoutthecroplifeandcombinationsof0.6+0.8(15)and0.8+0.6(In)IW/CPE ratiosandinigationsatcriticalgrowthstagesonly(112). ThecropETawasmaximum(489.4mm)intreatment1.2IW/CPEratiothroughoutcroplife(14)closelyfollowedby1.0+1.2(110)(486.5mm)and0.8+1.2(19)(478mm) IW/CPE ratios. While lowest ETa (259 mm) was recorded when irrigations were scheduledatcriticalgrowthstages(112). Ontheotherhand,wateruseefficiencywas highest(5.10kg/ha/mm)whenirrigationswerescheduledat0.8+1.0IW/CPEratio(13). As regardsto moistureextraction pattern cropplants in adequate soil moistureregimes [13(1.0IW/CPEratiothroughoutthecroplife),I4(1.2IW/CPEratiothroughoutthecroplife),16(0.6+ 1.0IW/CPEratio),17(0.6+ 1.2IW/CPEratio),18(0.8+ 1.0 IW/CPEratio),19(0.8+ 1.2IW/CPEratio)and110(1.0+ 1.2IW/CPEratio)treatments] extractedmoremoisturefrom0-40cmsoildepthincrement;whilecropplantsinrelatively drytreatments [11 (0.6 TW/CPE ratio throughoutthe crop life), 12 (0.8 IW/CPE ratio throughoutthecroplife),15(0.6+0.8IW/CPEratio),In(0.8+0.6IW/CPEratio),and112 (irrigationsatcritical grtstages)treatments] extractedbulkoftheirmoisture from lowerdepthsi.e.,20—60cm. Crop coefficients for sunflower ETa were developed based on open panevaporation methodandcalculation ofnet irrigationrequirementand gross irrigation requirement usingKcvalueswasdemonstrated. Theseasonalnetirrigationrequirement was 463.2 mm, while the gross irrigation requirement at field inlet and head works amountedto6617m3and 11580m3 respectively.Thepeakim'gationrequirementwas 4232In. ThecropyieldresponsetoseasonalETawasfoundtobe linearwithanR2of0.958. Seedyieldshowedsignificantpositivecorrelationwithplantheight,leafareaper plant,drymatterperplant,diameterofcapitulum,effectiveseedsperplant,totalnumberof seedsperplantandtestweight. Variationofplantwaterstressparametersviz,relativewatercontent,leafwaterpotential, diffusive resistance, transpiration rate andleaftemperature were largely a functionofwaterapplicationi.e.,IW/CPEratiosemployedduringthecropgrowingseason for scheduling irrigations. Seed yield and crop ETa showed significantly positive correlationwithrelativewatercontent,leafwaterpotentialandtranspirationrate,whileit was negativewithdiffusiveresistanceandleaftemperature.en_US
dc.identifier.citationD5695en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810048916
dc.keywordsRESPONSE OF SUNFLOWER(Helium/ms annuusL.)TO VARYING TW/CPE RATIOS IN SUMMER SEASONen_US
dc.language.isoenen_US
dc.publisherProfessor Jayashankar Telangana State Agricultural Universityen_US
dc.subAgronomyen_US
dc.subjectnullen_US
dc.themeAgronomyen_US
dc.these.typeM.Scen_US
dc.titleRESPONSE OF SUNFLOWER(Helium/ms annuusL.)TO VARYING TW/CPE RATIOS IN SUMMER SEASONen_US
dc.typeThesisen_US
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