[Survey on field experiments 2001, A: Experimental work and field conditions]

cereal crops clima climat climate crop yield cultivos de cereales cultivos de semillas danemark denmark dinamarca fertilisation fertilizer application field experimentation grain legumes gramineas graminee grasses land use leguminosas de grano plant protection plante racine porte graines precipitation protection des plantes rendement des cultures rendimiento de cultivos root crops seed crops temperatura temperature utilisation des terres