Two field experiments were carried out at  El-Bramoon Agricultural Research Farm of Mansoura Horticultural Research Station during the two successive winter seasons of  2004 and 2005, to investigate the effects of  spray with some microelements ( Fe, Zn and Mn each at 100 ppm), different fertilizer sources ( FYM, mineral fertilizer and control) and biofertilization with Rhizobium as well as their interactions on  yield and yield components and chemical constituents of pea plant (Pisum sativum L.) cv. Master-B.           Results revealed that spraying pea plants with a mixture of microelements significantly increased yield and yield components expressed as pod length, pod weight, number of green seeds /pod, weight of 100- green seed , seed index (1000-dry seed weight) and chemical constituents i.e.,  NPK, carbohydrates % and protein % of green seeds of pea plant in both seasons .        Results showed  that  fertilization with FYM was the most reliable treatment compared with chemical fertilizer and control treatments in both seasons          All studied characteristics of pea plants were generally greater with biofertilizer treatment (Rhizobium) than without it.            The best results were obtained from spraying pea plants with a mixture of microelements and application of FYM in the presence of Rhizobium inoculation.