13 years experiments with soil tillage and incorporation of straw and catch crop on a marsh soil [long term experiments, rotary cultivation]

aradura avena sativa avenas avoine azote barley beta vulgaris brassica alba catch cropping cebada crop yield cultivo intermedio cultivos de invierno cultivos de primavera culture d'hiver culture de printemps danemark denmark dinamarca encamado enfouissement enterrado experimentation fertilisation fertilizer application hordeum vulgare incorporation labour labranza lodging malezas mangolds marisma marshes mauvaise herbe nitrogen oats orge paille paja ploughing remolacha forrajera rendement des cultures rendimiento de cultivos rotation culturale rotational cropping spring crops straw tillage travail du sol trigo triticum verse weeds wheats winter crops