This study was carried out in the two growing seasons of 2008 and 2009. Five experiments were conducted in each season in the Experimental Agricultural Farm, Faculty of Agriculture, Assiut University. Each experiment represented one planting date. Through each experiment two variables were designed in split-plot design in which time of thinning was allotted in the main plots, whereas splitting NPK was in the sub-plots. The obtained results could be summarized as follows: 1-Total soluble carbohydrates, number of open bolls per plant, weight of seed cotton per boll in gram and Seed cotton yield of Kentar/fed were decreased significantly as planting date was delayed, On the contrary node number of the first sympodium was lowered. 2-The data revealed that thinning before the second irrigation favoured Plant height, total soluble carbohydrates, number of open bolls per plant, weight of seed cotton per boll and Seed cotton yield of March plantings, whereas the reverse was true with regard to the late plantings, i.e., thinning before first irrigation., On the contrary of that node number of the first sympodium was lowered in march plantings. 3-The data revealed that splitting fertilization increased significantly total soluble carbohydrates, number of open bolls per plant, weight of seed cotton per boll and Seed cotton yield. On the contrary of that node number of the first sympodium was lowered.

This study deals with in vitro, under greenhouse, and field efficacy of Trichoderma harzianum (Th1 and Th2), and two types of compost, plant compost (PC) and animal compost (AC) to control the soybean root rot disease caused by Rhizoctonia solani. In vitro study indicated that, Trichoderma spp. isolate Nos. 1 and 2 were the most effective on the pathogen growth, also both composts at 50% concentration were effective on the growth of the pathogen. The microbe population varied in the tested two composts (PC and AC), plant compost (PC) had a higher population of the recovered microbes than animal compost (AC) except in the case of fungi. Under greenhouse and field conditions, application of T. harzianum (isolates Nos. 1 and 2) and compost individually or in combination for controlling Rhizoctonia root rot disease showed a suppressive effect on severity of the disease and increased the yield of soybean. Under field conditions, treatments with (Th2) and (Th1+AC) caused the highest percentage of disease reduction. Treatments with PC and AC gave the lowest reduction of Rhizoctonia root rot disease compared with infected control.