ref name adv ref name jones nh sub sub sub sub mo sub sub sub sub na sub sub moo sub sub component enzyme nitrate reductase required rhizobia nitrogen fixation ref name jones nickel essential micronutrient ni sup sup ref name jones ref name adv niso sub sub nico sub sub essential many plants eg legumes grain crops ref name jones also used enzyme urease chlorine variable micronutrient cl sup sup highly variable kcl cacl sub sub mgcl sub sub nacl interfere uptake plants beneficial
Applied science Agriculture Hydroponics