Research Article 
Nitrogen Losses and Physiological Efficiency of Rice Influenced by Nitrogen Sources under Saline Soil Condition
Imdad Ali Mehmood and R.H. Qureshi
Pakistan Journal of Biological Sciences, 2000, 3(11), 1811-1813.
Abstract
Nitrogen losses under saline soil conditions (ECe = 1.7 and 10 dS m–1) and assimilation by rice crop grown in glazed pots were detected using two doses (600 and 800 mg N pot–1) of urea, ammonium sulphate and their combination (1:1). Salinity of 10 dS m–1 in the respective pots was developed artificially by mixing NaCI. With increasing salinity, a significant reduction in N-assimilation by the crop was observed while N materials and their rates significantly retrenched the hindrance effect. Average physiological efficiency was eminent with urea and ammonium sulphate combination at both the rates. Among the N materials, maximum N losses were observed through the straight application of urea or ammonium sulphate. The mixture fertilization even at lower dose was found as effective as the high dose in abating N losses and ultimately improving N use efficiency under the salt stress of 10 dS m–1.
ASCI-ID: 1-1717
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