Abstract
Plants need an optimum nutrition range as well as a least necessary limit. Below this minimum level, plants start to present nutrient deficiency signs, so the experiment was conducted in a Plastic Greenhouse of the department of plant protection at the College of Agriculture, the University of Al-Anbar from 20/8/2020 to 20/6/2021 to know study the effect of the superphosphate fertilizer four levels (0,1.5,3 and, 4.5) gm/kg soil and Trichoderma harzianum with three levels (0, 5, and 10) gm/kg soil on growth of Clover Plant. Those variables were used, in addition to the interaction between them, to study the effects on the vegetation and flowering characteristics. The best results were obtained when using the at the treatment of Phosphate fertilizer P2O5 with 4.5 gm and biological fungus with 10 gm/kg soil. The result was leaf area was 12 cm2, Chlorophyll 87.18 mg/100gm damp weight, Anthocyanin 40.12 per g dry weight, flower diameter 9.58 cm, and the surface area of roots was 70.74 cm2.
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