LONG TERM EFFECT OF PRESCRIPTION BASED FERTILIZER APPLICATION ON ZINC FRACTIONS IN SOIL.
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Date
22-06-19
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CSKHPKV, Palampur
Abstract
The presentt iinvesttiigattiion was carriied outt on wheatt duriing rabii,, 2017-18 tto
sttudy tthe effectt of prescriipttiion based ferttiilliizer applliicattiion on diifferentt fracttiions of
ziinc iin a llong tterm experiimentt iiniittiiatted duriing khariiff,, 2007 att tthe experiimenttall farm
of tthe Departtmentt of Soiill Sciience CSK HPKV,, Pallampur.. The experiimentt was llaiid
outt iin a randomiized bllock desiign consiisttiing of eiightt ttreattmentts.. The soiill of
experiimenttall fiielld was siilltty cllay lloam iin ttextture,, pH 5..2,, organiic carbon 7..2 g kg--1
and avaiillablle N,, P and K sttattus was 236,, 41 and 272 kg ha--1,, respecttiivelly.. The soiill
samplles from 0- 0..15 m soiill deptth were collllectted before and aftter harvestt of wheatt..
The soiill samplles were anallyzed for physiicall,, chemiicall,, biiollogiicall properttiies and
diifferentt fracttiions of ziinc iin soiill att harvestt of tthe crop.. Graiin and sttraw samplles were
collllectted from each pllott and anallyzed for N,, P,, K,, Fe,, Mn,, Zn,, Cu conttentt and ttheiir
upttake by graiin and sttraw of wheatt..
The sttudy revealled tthatt tthe ttargett yiielld of 35 q ha--1 wiitth FYM resulltted iin
hiighestt wheatt graiin yiielld (34..9 q ha--1) and sttraw yiielld (58..4 q ha--1).. In prescriipttiion
based ferttiilliizer applliicattiion for ttargetted yiielld of 25 q ha--1 wiitth and wiitthoutt FYM a
siigniifiicantt hiigher graiin and sttraw yiielld was recorded as compared tto ttreattmentts
where ferttiilliizer was applliied as per soiill ttestt based and generall recommended dose.. A
siigniifiicantt iimprovementt iin nuttriientts upttake was recorded iin ttargett yiielld ttreattmentts
wiitth FYM as compared tto wiitthoutt FYM ttreattmentts.. The DTPA-exttracttablle
miicronuttriientt cattiions,, organiic carbon,, and miicrobiiall biiomass carbon were hiigher iin
25 and 35 q ha--1 ttargett yiielld ttreattmentts wiitth FYM iin compariison tto restt of tthe
ttreattmentts.. The conttiinuous use of chemiicall ferttiilliizers broughtt outt marked depllettiion iin
tthe poolls of Zn,, whiille iinttegratted applliicattiion of FYM and chemiicall ferttiilliizers
recorded rellattiivelly hiigher conttentt of poolls of Zn over chemiicall ferttiilliizer applliicattiion..
Resiiduall Zn was tthe mostt domiinantt fracttiion of ziinc conttriibuttiing aboutt 49..94 per centt
and non-speciifiicalllly adsorbed exchangeablle ziinc was tthe lleastt domiinantt fracttiion of
ziinc conttriibuttiing aboutt 0..43 per centt tto ttottall ziinc..