Nitrogen losses and physiological efficiency of rice influenced by nitrogen sources under saline soil condition
2000
Mahmood, I.A. (National Agricultural Research Centre, Islamabad (Pakistan). Land Resources Research Inst.) | Qureshi, R.H.
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 NaCl. 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.
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