Irrigated pasture soil nitrogen is a part of dynamic, living, and complex biogeochemical cycle.
Soil sampling and nitrogen management strategies will vary depending on the soil moisture and temperature regimes of the pasture.
Total nitrogen in the soil is not the same as plant available soil nitrogen (PAN). Physical and chemical characteristics of soil can alter the plant availability of soil nitrogen.
Matching multiple nitrogen applications with crop needs through out the growing season can lead to increased agricultural efficiency and reduced leaching and run-off of nitrate-nitrogen.
Here are some resources for understanding nitrogen in irrigated pasture.
Nitrogen Assessment Link
Soil Solution Page
These fields are for characterizing and assessing the herd that utilizes this pasture during parts of the crop year.
The first step requires the selection of all species types of livestock that graze the pasture through out the crop year. If the pasture is utilized to support multiple species. Select all that apply. In our example, we have selected cattle to represent our hypothetical cow-calf herd.
The second step will be to select the classes of livestock. For example, a cow-calf herd that grazes the pasture at different times of year may have cows with calves, mature cows without calves, and weaned calves that were formerly paired with cows. We would select those three classes.
The next step would be to enter the number of animals and the grazing duration for each class.