الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Common bean (phaseolus vulgaris l.) is one of the most important vegetable crops in Egypt. It has long been recognized to be either sensitive or only moderately tolerant to salinity In general, Egypt as a country always suffers from the increasing of population and has both drought and arid climate resulting high salting in soil. Usually, tremendous losses in crop production occur annually in our nation because of soil salinity. The increasing demand on water for reclamation lands raised the necessity of using the number of irrigation. The idea of using the plant growth regulators to alleviate adverse effects of salinity stress or drought stress on higher plants was put forward quite early.
So, two experiments were carried out in the farm of Fac. of agric.; mansoura university during the two seasons of 2008 and 2009, to investigate the effect of soil salinity , proline treatments and some irrigation levels on plant growth, yield and biochemical constituents of common bean (phaseolus vulgaris L.). Cv. Nebrasca. Factorial randomize complete block design with three replicate was used in this study. Two types of soil (clay and salinity) and two time proline treatments (with 100 ppm and control) were used with foliar ways after 21 days from sawing and four irrigation treatments (2, 4, 6 and 8 irrigations). The experiments included 16 treatments in three replicates, 2 treatments of salinity and 2 proline treatments and four irrigations, they the total number of pots required for each season was 48 pots.
The results obtained can be summarized as follow: -
1- vegetative growth characteristics
Plant height, umber of leaves, fresh weight, dray weight and leaf area
1-1- Effect of soil types : vegetative growth of common bean plant in term of plant height, number of leaves, fresh weight, dry weight and leaf area was reduced in case of planting common bean plant in saline soil during the both seasons.
1-2- Effect of number of irrigation: decreasing the number of irrigation on common bean plant significantly decreased vegetative growth in two seasons comparing with the increased number of irrigation.
1-3- Proline treatment: application of proline treatment (with 100 ppm) caused positive effect on vegetative growth of common bean plant comparing with the untreated plant in two seasons.
1-4- The triple interaction: the interaction between soil types, number of irrigation and proline treatment had significant effect on all parameters of vegetative growth in both years except leaf area in the second year.
2- flowering parameters, pod’s parameter and Fruit setting
2-1 - Effect of soil types: saline soil had deleterious effect on flowering parameters and caused a marked decrease in the average number of common bean flowers per plant, number of pods per plant. Saline soil had a depressive effect on fruit setting ratios.
2-2- Effect of number of irrigation: decreasing the number of irrigation on common bean plant led to injuring effect on flowering parameter and the average number of pods per plant likewise; caused a depressive effect on fruit setting ratios in two seasons comparing with the case of growing common bean plant with more number of irrigation .
2-3 Proline treatment: application of proline treatment (with 100 ppm) had no obvious increase in this respect
2-4- The triple interaction: the interaction between soil types, number of irrigation and proline treatment had significant effect on all parameters of flowering ,number of pods and fruit setting growth in both years.
3- Pod’s diameter, pod’s length and Total yield
3-1-- Effect of soil types: soil salinity caused significantly decrease the average diameter of pods and length of pods in this character for common bean plant. Salinity soil also decreased the total green yield of common bean plant as compared to planting common bean in soil clay in two seasons.
3-2- Effect of number of irrigation: decreasing the number of irrigation on common bean plant led to significantly decreased the average diameter, length of pods and the total green yield of common bean plants in two seasons.
3-3- Proline treatment: application of proline treatment (with 100 p.p.m) can be corrected the depressive effect of salinity soil or decreased number of irrigation relatively in this respect in both seasons.
3-4- The triple interaction: the interaction between soil types, number of irrigation and proline treatment) had obvious increase in the average diameter of pods, length of pods and the total green yield of common bean plant in both seasons.
4- Mineral composition
4-1- Effect of soil types: soil salinity caused significantly decreased the contents of common bean leaves from N, P, K and Mg (as %). While; the same effect had significant effect for Ca and Na% contents during the both seasons. Comparing with the case of planting common bean plant in clay soil.
4-2- Effect of number of irrigation: decreasing the number of irrigation on common bean plant led to decreased mineral contents N,P,K and Mg (as % ) of common bean plant . While; the same effect for Ca and Na % contents increased significant relatively during two seasons.
4-3- Proline treatment: an application of two proline treatments (with 100 ppm) led to relatively increase mineral concentration in both years.
4-4- The triple interaction: the interaction between soil types, number of irrigation and proline treatment had significant effect on the contents of common bean leaves in both seasons.
5-Chlorophyll, Proline and Curde protein accumulation
5-1- Effect of soil types: saline soil had injurious effect on chlorophyll contents and curde protein in pods at maturity stage and tended to accumulate less content values than those obtained from the plants grown under clay soil. On the contrary the adversely effect was realized for the leaves contents of proline for common bean leaves at green maturity stage in two seasons.
5-2- Effect of number of irrigation: decreasing the number of irrigation on common bean plant led to a significant decrease in pigment content in leaves common bean. Likewise, a significantly decrease in cured protein content on pods at green maturity stage was observed. While; accumulation height proline content in this case of planting common bean plant in soil salinity.
5-3- Proline treatment: an application of two proline treatments (with 100 p.p.m) can be corrected the depressive effect of salinity soil or decreased number of irrigation relatively in the contents of common bean leaves from pigments content and cured protein in pods at green maturity stage .and also rise the increasing of proline content in two seasons.
5-4- The triple interaction: the interaction between soil types, number of irrigation and proline treatment had significant effect on the contents of common bean leaves and pods at green maturity stage in both seasons.