Influence of claypan soil topsoil thickness and fertility factors on corn and soybean yield
Kitchen, N.R.; Sudduth, K.A.; Fridgen, J.J.
Proceedings of the 5th International Conference on Precision Agriculture, Bloomington, Minnesota, USA, 16-19 July, 2000: 1-16
Soil sampling for fertilizer recommendations is most often from the surface 15 to 20 cm. The nutrient pool available to crops however might be quite variable when considering the spatial variation in the sub-soil nutrient pool. The objective of this research was to assess the potential interaction between claypan soil topsoil thickness (i.e., depth to the claypan) and soil-test phosphorus (P) and potassium (K) on maize and soyabean crop response.