1. Mapping maize and soybean yields using GPS and a grain flow sensor;Cahn,1994
2. FESLM: An International Framework for Evaluating Sustainable Land Management;FAO,1993
3. Field scale variability of soil structure and its impact on crop growth and nitrate leaching in the analysis of fertilizing scenarios;Finke;Geoderma,1993
4. Sampling for site-specific fertilizer application;Franzen,1994
5. Innovative soil sampling and analysis procedures for the local resource management of agricultural soils;Murphy,1994