L12-Soil-Test-Crop-Response-PPT.pdf

STCR soil test crop response

1. Soil Test Crop Response
(STCR)(STCR)
LECTURE 12

2. 12.1Introduction
•Soiltestcropresponse(STCR)study
basedonsoiltestbasedfertilizer
recommendationshouldbecarriedout
todevelopquantitativebasisfor
calculatingtheprofitmaximizingdosecalculatingtheprofitmaximizingdose
offertilizersbasedonsoiltestforany
crop.

3. 12.2What is Soil Test Crop
Response
•Soiltestingisarapidchemicalanalysisto
accessavailablenutrientstatusofthesoiland
includesinterpretation,evaluationand
fertilizerrecommendationbasedontheresult
ofchemicalanalysisandotherconsiderations.ofchemicalanalysisandotherconsiderations.
•Achemicalmethodforestimatingthenutrient
supplyingcapacityofasoil.
•Itcandeterminesoil’snutrientstatusbeforea
crop(field,vegetable,ornamental)isplanted.

4. 12.3Objectives of STCR
•Tostudytherelationshipbetweensoiltest
valuesforavailableN,P,Kandyield
responsetoimportantcrops.
•Toderiveyieldtargetingequationsfor
importantcropsformakingfertilizerimportantcropsformakingfertilizer
recommendations.
•Toevaluatevarioussoiltestmethodfortheir
suitabilityunderfieldconditions.
•Toevaluatetheextenttowhichfertilizer
needsofcropcanbereducedinrelationwith
conjunctiveuseoforganicmanure

5. 12.4 Targeted Yield
Approach
•Targetedyieldconceptisanapproachcomes
underSTCR.
•Forobtainingagivenyieldadefinite
quantityofthenutrientsmustbetakenupby
thecrop.thecrop.
•Oncethisrequirementisknownforagiven
yield,therequirementoffertilizercanbe
estimatedbytakingintoaccountefficiency
ofthesoilavailablenutrientpoolandthatof
fertilizerrequirement

6. 12.5 Concept of STCR
•STCRapproachisaimingatobtaininga
basisforprecisequantitativeadjustmentof
fertilizerdosesundervaryingsoiltestvalues
andresponsefortargetedlevelsofcrop
production.production.
•STCRprovidestherelationshipbetweena
soiltestvalueandcropyield.
•Thesearetestedinfollowupverificationby
fieldtrialstobackupsoiltestinglaboratories
fortheiradvisorypurposeunderspecific
soil,crop,andagroclimaticconditions

7. 12.6 Methods of STCR
•Gradient experiment
•Test crop experiment

8. 12.7 Conditions for yield
targeting equation
•Usedforsimilarsoilsofparticularagro-eco
region.
•Maximumtargetsshouldnotexceed75-80%
ofhighestyieldachievedforthecropinthe
area.area.
•FertilizerNrecommendationsforlegumes
shouldbesameasgeneraldoseofthecropof
thearea.
.

9. 12.9 STCR Approach for
Precision Agriculture
•Undernormalconditions,recommendedsoil
samplingprocedureistotakesamplesfrom
portionsoffieldsarenomorethan20acres
inarea
•Gridsoilsamplingusesthesameprinciples•Gridsoilsamplingusesthesameprinciples
ofsoilsamplingbutincreasestheintensityof
sampling
•Thegoalofgridsoilsamplingistogenerate
amapofnutrientrequirementcalledan
applicationmap
•Applicationmapisloadedintothecomputer
mountedonvariableratefertilizerspreader

10. Thank YouThank You