Effects of nitrate, ammonium and chloride application on the yield and nitrate content of soil-grown lettuce

absorption de substances nutritives ammonium compounds ammonium nitrogen azote chlorides chlorure cloruros compuestos de amonio cultivo protegido culture sous abri inhibiteur de nitrification lactuca sativa laitue lechugas lettuces nitrate nitrates nitratos nitrification inhibitors nitrogen nutrient uptake protected cultivation