An Experiment was conducted in 2004 at King Abdulaziz University Agricultural Experimental Station, in the Western region of Saudi Arabia to evaluate the effect of soil solarization, by mulching the soil with transparent polyethylene sheets in combination with three different green manure amendments by adding cabbage, conocaes or neem leaves to soil prior to solarization on population densities of soil fungi, weed growth and yield of two varieties of zucchini plants. The total number of soil fungi was declined by 63% immediately after solarization then increased at the end of the first and second season to 80% of the initial pre~solarization soil samples. Soil amendment with conocarpus, neem or cabbage decreased the populations of soil fungi by 40.1, 30.9 and 30.3%, respectively. Weed growth was declined by 92.5% in solarized soils, and to a less extent by manure amendment that ranges from 26-40% reduction. Yield of zucchini plants was increased by 13.4% in solarized soils as compared to non—solarized soils. Amendment with green manure alone, however, increased yield by 14.5-19.B%. More yield of zucchini plants and more control of weeds was obtained in solarized amended soils than in solarized or amended soils alone.