Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.1999.95.97MahmoodI.A. AslamM. 1199921Soil Nitrogen and Organic Matter were determined before sowing and after the harvest of crops to assess the effect of wheat and chickpea growth on soil fertility. Chickpea crop utilized less soil N and NO3-N as compared to other crops even when nitrogen was applied but it caused a significant increase of nitrogen and organic matter in soil whereas wheat exhausted the nutrients. The total N and NO3-N level in the soil fell down much more in case of wheat cultivated without N application. The control treatment showed a slight fluctuation in measured parameters. Organic matter of the soil was ameliorated by crops grown over the season comparatively better by chickpea crop.]]>Aslam, M., I.A. Mahmood, S. Ahmad, M.B. Peoples and D.F. Herridge,19971997pp: 353-360pp: 353-360Barber, S.A.,197971625627Brown, P.L. and D.D. Dickey,197034118121Buyanovsky, G.A. and G.H. Wagner,1986935765Buyanovsky, G.A., C.L. Kucera and G.H. Wagner,198566149150Coleman, D.C., C.P.P. Reid and C.V. Cole,198313155Gregorich, E.G., B.C. Liang, B.H. Ellert and C.F. Drury,199660472476Herridge, D.F., H. Marcellos, W.L. Felton, G.L. Turner and M.B. Peoples,19952 fixation.]]>27545551Jenkinson, D.S.,19711116470Loomis, R.S. and P.A. Gerakis,19751975pp: 145-172pp: 145-172Low, A.J.,197223363380Richards, L.,1954Pages: 160Pages: 160Sauerbeck, D.R. and B.G. Johnen,19771977pp: 141-147pp: 141-147Smith, J.T. and C.L. Douglas,197135269272Soltanpour, P.N. and S. Workman,19794 HCO3-DTPA soil test to omit carbon black.]]>1014111420Steel, R.G.D. and J.H. Torrie,19802nd Edn.,Pages: 633Pages: 633Whipps, J.M.,198435767773Rupela, O.P., 199232349352