1. Using Soil Samples and Soil Sensors to Improve Soil Nutrient Estimations

Estimating soil nutrient levels, especially immobile nutrients like P and K, has been a primary activity for providers of precision agriculture services.  Soil nutrients often vary widely within fields and growers have been eager to manage them site-specifically.  There are many causes of the variability, including pedogenic factors such as soil texture, organic matter, landscape position and other factors that have resulted in an accumulation of unused nutrients in some areas of the... C.R. Maxton, T. Lund, E. Lund