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International Conference on

Recent Trends in Environmental Sustainability

ESCON22/SAgri/28
Comparative effect of nitrogenous fertilizers on mobilization and absorption of
phosphorus by wheat in saline-sodic soil

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Maham Noreen , M. Sabir , Hamaad Raza Ahmad , Saifullah , Sadia Bibi and G. Murtaza
1 Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad
Correspondence: cmsuaf@gmail.com
Abstract
Salinity is a major problem of arid and semi-arid zones which decreased the crop yields. Proper
nutrient management in salt-affected soils can ameliorate the adverse effect of salinity in crop
yields. A pot research was conducted in wire house to investigate the growth response of wheat
(Triticum aestivum L.) to different nitrogenous (N) fertilizers and their influence on
mobilization and absorption of phosphorus (P) by wheat in saline-sodic soil. Three N fertilizers
viz. urea, calcium ammonium nitrate (CAN) and ammonium sulphate were applied to the soils
with two levels of salinity and a normal soil as control. The experimental pots were laid out
following completely randomized design (CRD). Nitrogen fertilizers urea, CAN and
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ammonium sulfate were applied as 1.5×10 , 2.6×10 and 3.2×10 Kg ha respectively along
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with the basal dose of 7.42×10 and 2.6×10 Kg ha of K and P per kg of soil. The pots without
addition of any fertilizer were taken as control. Salinity was developed using calcium (Ca),
magnesium (Mg) and sodium (Na) salts to attain two levels of EC and SAR i-e, (EC=6 d S m -
1 , SAR=19) and (EC=12 d S m , SAR=26), using quadratic equation. Crop was harvested after
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90 days of sowing. Soil properties like pH, EC, organic matter, textural analysis, carbonates,
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bicarbonates, Cl , Ca + Mg and also nitrogen, potassium and phosphorus concentration in soil
samples were determined. For plants, chlorophyll content, plant height, root, shoot fresh and
dry weight were recorded. Nitrogen and phosphorus concentration in plant sample’ was
determined after digestion. The collected data were statistically analyzed using appropriate
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statistical design. The maximum shoot fresh weight (6.6 g plant ), shoot dry weight (3.26 g
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plant ), root fresh weight (0.77 g) and root oven dry weight (0.39 g) was observed in soil of
EC=12 and SAR=26 with the application of ammonium sulphate and maximum plant height
(68 cm) was observed in normal soil with the application of ammonium sulphate as compared
to control. Maximum N contents in plant shoots (32.2%) was observed in soil of salinity level
S3, i-e:- (EC=12 and SAR=26) with the application of calcium ammonium nitrate (CAN) and
maximum P contents in plant shoots (2.69 ppm) were observed in soil of salinity level S3, i-e:-
(EC=12 and SAR=26) with the application of ammonium sulphate.
Keywords: Salinity; sulphate; Nitrogen fertilizer; phosphorous

Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus

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