1. Nitrogen fertilizing systems and harvest frequency effects on percent hardseedness and hardseed breakdown trend in annual medic (Medicago scutellata Var. Robinson);Ahmadi;World J. Agric. Sci.,2007
2. A Comparative Analysis of Global Cropping Systems Models and Maps;Anderson,2014
3. A spatial econometric approach to the economics of site-specific nitrogen management in corn production;Anselin;Am. J. Agric. Econ.,2004
4. ArcGIS 9.2 Desktop Help, 2007a. How inverse distance weighted (IDW) interpolation works, (retrieved July 24, 2015).
5. ArcGIS 9.2 Desktop Help, 2007b. Map projections and coordinate systems: lambert conformal conic, (retrieved July 24, 2015).