Thesis (Ph.D.) - Cairo University - Faculty of Agriculture - Department of Agricultural Biochemistry

Cotton still represents the most important crop and a main element in Egypt{u201F}s national economy. Pests infesting cotton affect the crop{u201F}s quality and yield. Pesticides are considered to be one of the major elements in protecting cotton production. The present work is to evaluate the effects of pesticides and their residues on the physical and chemical properties for fiber and seed on cotton varieties Giza 86 and Giza 90. The results indicated that pesticide residues in Giza 86 fiber and seed, were found also significant decrease in fiber length, fineness, brightness (Rd%), fiber strength, but significant increase in fiber elongation and yellowness (+b) with insignificant differences between Giza 86 and Giza 90 seasons 2012 and 2013. The present results showed significant increase in protein during the same season 2012 as well as insignificant variations between Giza 86 and Giza 90 varieties seasons of 2012 and 2013 in cottonseed constituents. The another results revealed that the quality of organically grown cotton was equal to or better than conventionally grown cotton. Fineness and maturity values for all the cultivars at 2012 and 2013 were satisfactory for the organic and conventional cotton and the oil content of cottonseed of Giza 86 and Giza 90 in seasons 2012 and 2013 was less than the organic samples and vice versa for protein content. These mean that the pesticides application produced pesticide residues and changes in the physical, chemical and mechanical properties

Issued also as CD