id	keyword
ahs-2944	nitrate
ahs-2944	mineral
ahs-2944	winter
ahs-2944	content
ahs-2944	nitrogen
ahs-2944	cycle
ahs-2944	fertilization
ahs-2944	yield
ahs-2944	crop
ahs-2944	nitrate content
ahs-2944	autumn
ahs-2944	control
ahs-2944	kg·ha-1
ahs-2944	fertilizer
ahs-2944	spring
ahs-2944	radish
ahs-2944	plant