Interaction of irrigation and shallow ploughing as influencing the yields of field crops in dependence on fertilization level [maize, wheat, sugar-beet, barley, lucerne]

agricultura de regadio agricultural chemicals agronomic characters aradura barley cebada cereales cereals cropping patterns cropping systems crops cultivation cultivo cultivos cultivos de grano dicotiledoneas dicotyledons economic plants engrais feed crops feed grasses feed legumes fertilizers glumiflorae grain crops gramineae gramineas graminee grasses industrial crops irrigated farming labour labranza legumes leguminosae leguminosas leguminosas forrajeras medicago medicago sativa methode methods mode de culture monocotyledons oil crops orge papilionoideae plantas plantas azucareras plantas feculentas plantas forrajeras plantas industriales plantas oleaginosas plante plante de culture plante industrielle plante racine plants ploughing pratique culturale productividad productivity produit agrochimique profitability remolacha azucarera rendement rendimiento rentabilidad root crops rosales rotational cropping sistemas de cultivo starch crops sugar beet sugar crops tillage travail du sol trigo trigo de invierno wheats winter wheat yields zea mays