This study was conducted inside the wire house of the Department of Biology/ College of Education for Pure Science/ Mosul University for the agricultural season 2018- 2019 to test the effect of vegetative and root residues of Medicago satival
on the chemical content and antioxidant enzyme fenugreek plant Trigonella foenum- graecum
L. (Iraq and Indian) growth under three different levels of field capacity (25, 50 and 75%). The experiment was designed as a factorial randomized complete block design (RCBD). The result showed that the addition of vegetative residues of caused an increase the concentration of enzymes peroxidase, catalase, nitrogen, phosphorus, potassium, calcium and magnesium as compared to the root residues and the control treatment (without residues) while the filed capacity 75%, exceeded compared to the field capacity 25 and 50% in concentration of phosphorus, potassium, calcium and magnesium with the exception of nitrogen concentration, peroxidase and catalase. On the other hand, Indian cultivar was superior compared to cultivar Indian in most studied traits. Antioxidant enzyme.