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In general, crop rotations are well documented for their economic and agronomic benefits to producers and the soil they till. Crop rotations are known to aid in pest management (weed, insect and diseases), reduce soil erosion, maintain soil organic matter (OM), provide biologically fixed nitrogen (N) when legumes are part of the rotation scheme, and manage overall nutritional levels (Singer and Bauer, 2009; Arnold Bruns, 2017). Rotations involving the use of legumes, with few exceptions, have shown gains in economic yields of successive nonleguminous crops due to residual N fixed through symbiosis of the legume crop and a Rhizobium species of bacteria (Tisdale and Nelson, 1975). Reports on rotation experiments of cotton with soybean are not as numerous as with other crops. Inconsistent yield responses of cotton yields following soybean have been reported in some studies (Bryson et al., 2011: Davis et al., 2003; Rochester et al., 2001). Rochester et al. (2001), did report that N fixed by soybean partially fulfilled the N requirements of a succeeding cotton crop. Pettigrew et al. (2016) recently concluded that cotton demonstrated a yield increase following soybean that was likely due to increased levels of soil N through fixation from the previous soybean crop or an alteration of soil microbial populations favorable to the succeeding cotton crop. The objective of this part of the above mentioned experiment (Pettigrew et al., 2016) was to determine if changes in the availability of most nutrients occurred as the rotation experiment progressed.

Effects of Rotation of Cotton (Gossypium Hirsutum L.) and Soybean [Glycine Max (l.) Merr.] Crops on Soil Fertility in Elizabeth, Mississippi, USA