The use of measurements of soil mineral N in understanding the response of crops to fertilizer nitrogen in intensive cropping rotations

abonos nitrogenados agriculture intensive azote barley brassica oleracea cauliflowers cebada chou fleur coliflor cropping systems crops cultivos intensive farming loam soils nitrogen nitrogen fertilizers nutrition des plantes orge plant nutrition plante de culture reino unido rotation culturale rotational cropping silty soils sistemas de cultivo soil sol sol limoneux sol sablolimoneux suelo suelo franco suelo limoso united kingdom