Improvement of leguminous vegetables production in calcareous soil by addition of some acidifying materials .1. Effects on yield and yield components

Two field experiments were carried out in two sites of Noubaria Agricultural Research Station Farm. The investigated acidifying materials were sulphur, superphosphate and Phosphorine. The materials were mixed with cowpea seeds just before sowing in a rate 1 kg for seeds required to 1 fed (4200 m(2)) in the first experiment. Additions were 100, 30 and 1 kg S, P2O5 and Phosphorine/fed, respectively to soils before common bean planting in the second experiment where the two varieties Giza 3 and Giza 6 were put under investigation. The residual effect of the soil additions was investigated using bean as a test crop. The obtained results showed that acidification materials were effective in such soil for seed yields of cowpea and common bean - while the residual effect on bean was unconsiderable. The variety Giza 6 of common bean was significantly superior to Giza 3. The harvesting index was higher by using sulphur or superphosphate than Phosphorine in the case of cowpea while in common bean superphosphate and Phosphorine were more active in increasing this index than sulphur. Acidification process resulted in some increases in harvest index of bean regardless the used material. As for 100 seed weight, it was raised in significant level by using sulphur or superphosphate than Phosphorine or control in the case of cowpea while all treatments were statistically equal in the case of common bean and bean.