Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2003.1408.1412Al-RedhaimanK. N.HelalM.I. D.ShahinR. R.122003616Volatilization of NH3 is a major factor affects ammonical fertilizer use efficiency particularly when
N-fertilizers are surface applied to sandy soil characterized by high pH values and low CEC. Effect
of blending various N-fertilizers; urea, U, ammonium sulfate, AS, ammonium nitrate, AN and di-ammonium phosphate, DAP; with elemental sulfur, on fertilizer-N utilization and quality of lettuce
yield were studied. The results of lettuce yield grown in greenhouse showed significant increase in
lettuce fresh yield (ranging from 9.8-18.9%) of treatments received S comparing with those received
no S. The effect of S on dry matter of leaves and stems was insignificant. Total N content of leaves
and stems showed a significant increase varied between 10.4-20.6 and 8.4-18.5%, respectively.
Total-N uptake by lettuce plants treated with sulfur-blended fertilizers was increased by 20%(U)-52(AN)%. Also, an increase in N recovery reached 70% of the applied was observed for sulfur-
blended N- fertilizer treatments, instead of 39-52% of those received no S. Nitrate and sulfate
contents of lettuce dry matter were significantly increased using S-blended fertilizers particularly in
the case of ammonium nitrate (AN) and ammonium sulphate (AS). The results of soil analysis
showed significant decrease in soil pH in the treatments received S blended fertilizer compared to
those received no S. On the other hand, electrical conductivity increased significantly from 1.8-2.1
to 2.1-3.2 dS m‾1 as a result of S addition. Insignificant increase in both SO4 and NH4 contents were
recorded for S treated samples.]]>Abdel-Magid, H.M.,199710561574Al-Kanani, T., A.F. Mackenzie and N.N. Barthakur,19915517611766Bremner, J.M. and L.A. Douglas,197135575578Fan, M.X. and A.F. Mackenzie,199357839845Ferguson, R.B., D.E. Kissel, J.K. Koelliker and W. Basel,198448578582Gasser, J.K.R.,196415258272Jackson, M.L.,1985Keeny, N.J., D.R. and D.W. Nelson,19821982Kissel, D.E., M.L. Cabrera and R.B. Ferguson,19885217931796Lal, Kh., D.L. Deb, M.S. Sachdev and K. Lal,1997268292Nelson, D.W. and L.E. Sommers,198063770778Olsen, S.R., C.V. Cole, F.S. Watanabe and L.A. Dean,1954Pages: 19Pages: 19Ouyang, D.S., A.F. Mackenzie and M.X. Fan,19986214431447Rainwater, F.N. and L.L. Thatcher,19601960Shahin, R.R. and A.S. Suliman,1998126677Shammas, A., M.G. Rafi, H.B. Sarhan and K. Al-Ghamdi,19971997Cataldo, D.A., M. Haroon, L.E. Schrader and V.L. Youngs,197567180