الفهرس 
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Abstract
The present dissertation aimed to investigate the effect of soil salinity, nitrogen, phosphorus and potassium fertilization and their interaction on plant growth, yield components and mineral composition of fodder beet plants. Two field experiments were conducted during the two successive seasons of 2000/2001 and 2001/2002 at ElSerw Agricultural Research Station (Damietta Governorate). Combined analysis over salinity in a split block design was performed, the three levels of phosphorus fertilization (0, 30 and 60 kg P2O5fed1) were assigned to the main plots and three levels of potassium fertilization (0, 60 and 90 kg K2Ofed1) occupied the subplots while the four levels of nitrogen fertilization (0, 60, 90 and 120 kg Nfed1) occupied the subsub plots. The total numbers of this trial are 36 treatments. Each treatments was replicated three times, in three soil salinity levels,(S1, S2 and S3 ) S1: where has E.C of 1.51.7 dSm1, S2: which has E.C of 4.34.7 dSm1 and S3: : which has E.C of 8.38.6 dSm1 hence 324 plots were prepared and the area of each was 3 x 3.5 m. Effect of soil salinity: 1 yield and yield components: A significant decreased in root diameter, top length, T.S.S.% and crude protein with increasing soil salinity levels. 2Nutrient concentration and their uptake: a significant decreased in N, P and k concentration and their uptake by plant with increasing soil salinity levels, on the other hand, a significant increased in Na concentration and its uptake by plant with increasing soil salinity level. Effect of NPK fertilization: 1 yield and yield components: A significant increased in root diameter, top length, and crude protein with increasing NPK fertilization, on the other hand, a significant decreased in T.S.S.% with increasing NPK fertilization. 2Nutrient concentration and their uptake: a significant increased in N, P and k concentration and their uptake by plant with increasing NPK fertilization, on the other hand, a significant decreased in Na concentration and its uptake by plant with increasing NPK fertilization.