Crop rotation is a necessity in potato production systems where year-round production is not possible due to extreme weather condition at certain months of the year or build up of diseses is a concern. This physical limitation presents an opportunity to renew the soil's physical, chemical and biological properties that can mitigate the extreme pressure it is subjected to by intensive potato culture. For a recommended crop rotation scheme to be acceptable, it must be a short term, and at the most three years, since potato farmers cannot afford not to grow potato for a prolonged period of time. Potatoes are sensitive to water availability and yet need to be grown in sandy textured soils. A way to justify use of a particular crop rotation scheme, is its ability to improve the water retention of sandy soil. This can be achieved through an improvement in the soil structure as represented by water stable aggregates. Eight treatments with variable abilities to contribute carbon to the soil were evaluated on their ability to improve water stable aggregates. Two commercial potato production fields were also sampled to determine the spatial variability across the landscape of the variable under study. Commercial fields had a higher proportion of organic carbon found in the greater than 250 micron aggregate size fraction, while the baseline data from the crop rotation trial indicated majority of the carbon were held in the less than 250 micron size fraction. Moisture was significantly and positively correlated with the 1000 micron size fraction. It was hypothesized that crop rotation trial involving the presence of leguminous plants will improve aggregation and lower the ratio of carbon being deposited in the larger than and lower than 250 micron aggregate size.