ABSTRACT High winter cereal yields depend on an adequate supply of nitrogen (N). We developed a system for indicating N rates for wheat and barley in the South-Central region of the state of Paraná, B
Photograph of a field of fig trees, Southern California, 1927. "79-14-41 1927; Randolph Brandt Co.; Fig Trees, agriculture, and irrigation" -- on envelope.
Formalisms for representating and reasoning with knowledge about crop yield improvement have been reviewed. Some of these representations were automated and analysed.
