Start Date: Jul 01, 2013
End Date: Mar 31, 2016
The initial studies under this agreement focus on the evaluation of the impact of biotic soil amendments on soil health parameters under a combination of laboratory and field conditions. An assessment will be made of the effect of biotic soil amendments on soil biological activity using respiration and carbon dioxide evolution from the soil as the primary variable along with changes in the soil aggregate stability. A series of laboratory incubation studies evaluating this response for different soils would be conducted for different soil moisture and temperature regimes. The soils used in these analyses would be marginal soils with low organic matter contents. The conduct of these studies would be to utilize disturbed sieved soil samples in 25 cm pots with a depth of 30 cm filled with soil packed to a bulk density typical of surface soil. Biotic fertilizer material would be applied to the surface layer of the pot, followed by a watering to move the material into the soil. Pots would be watered to maintain the soil at 0.75 of field capacity. The first incubation would be conducted on soil with no plants and the second with a small grain crop to evaluate the added effect of root material on the soil biological system. The response of the biotic fertilizer would be compared to no addition of nutrients and to an incorporated urea fertilizer. Each of these treatments would be replicated five times to allow the entire experiment to be conducted in one growth chamber. The chamber environment would be maintained with a maximum of 27°C and minimum of 15°C for the duration of the incubation study.