EFFECT OF NITROGEN SOURCES AND LEVELS ON AMMONIA VOLATILIZATION AND AMMONIUM FIXATION IN SWELL-SHRINK SOILS OF MAHARASHTRA
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Date
1996
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The effect of urea (U), ammonium nitrate (AN), ammonium
sulphate (AS) and dianwonium phosphate (DAP) and) 100, 200 and at 400 mg N kg-1 levels on ammonia volatilisation and ammoniutt
fixation was studied la ten widespread and benchmark swell
shrink soils of Maharashtra under laboratory conditions. The
physical and chemical properties of these soils were studied
and correlated with ammonia volatilization and ammonium
The soils were alkaline and calcareous, low in organic
matter and soluble salts (except Rastapur and Miraj}* high in
CEC and clay and highly base saturated. Saturation paste
extract of Rastapur, Miraj* Dholwad soil series showed saline
sodic features with higher values of pHe, ECe with dominance of Na+, Mg2+ and HCO* ions as comparad with other swell.
sbrink soils of Maharashtras
The Kiranapur and Aroli soil series showed the lower
ammonia volatilisation losses from different sources of
nitrogen. The Rastapur, Miraj and Dholwad soil series with saline sodic features resulted in higher cumulative ammonia
loss. The surface application of ammonimnitrate and urea
showed lower ammonia volatilization, whereas it was higher
with diammonium phosphate and ammonium sulphate application*
With increasing levels of nitrogen application, there was
increase in ammonia (12.7 to 13*3 tag kg**) volatilization
loss, the BAP* AS and AN showed maximum loss of ammonia,
but urea showed delayed ammonia loss and the peak, was noticed fch .1 on 4 day at 100 to 200 mg leg * level of nitrogen and on 6 day at 400 ag kg*1 level of nitrogen*
Ammonium fixation showed wide variation (37.1 to 60.6 ag kg*2) in swell-shrink soils of Maharashtra* Higher
—.niu- «*.««, «. *.«,«, x» KiTB^ur (W.. -g *,"*> and Aroli (55.9 mg kg**1) soil series* The Rastepur and
Mir0J soil series having saline sodic features fixed less
ammonium ions* Among the fertilizer sources, the urea audi
ammonium nitrate showed the higher ammonium fixation and
increased it with increase in levels of nitrogen applied*
The soil pH, EC* free CaC03# exchangeable N«+, organic carbon and total H contents of soil and pHe, ECe, Na+ and
HCO* of saturation paste extract of soil showed significant
positive correlation with ammonia volatilization* However* these characters were negatively correlated with ammonium fixation, She presence of C*2** Mg2* end Ci* in saturation
paste extract showed negative correlation with ammonium
fixation, is general, the awaoniura fixation capacity was
negatively correlated with aawonia volatilization of applied
H in swell-shrink soils of Maharashtra.
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