Nitrogen Fixation and Nitrification in Various Soil Types |
Common terms and phrases
accumulation acid activities added ammonium sulphate amount Ashby's Average increase Azotobacter Bakt brought Cecil Clay Cent Clay Loam clay soils collected Comparative condition Controls County cultivated samples cultivated soils Effect exerts exhibited experiment fact factors failed failure fertility figures five fixation tests fixing flasks flora given grams of soil Hagerstown heavy higher increase in nitrates incubator indicate influence interest laboratory light lime maximum method nitrate nitrification nitrifying power nitrogen fixation nitrogen fixing Norfolk Sandy Loam noted Number of pairs number of soils observed obtained one-fourth sand organic original percent points pots pounds present previously probably produced qualities received reference regard relationship reported sand sandy soils showed six months soil types solution Station Superintendent superiority Table texture tion total nitrogen treatment Various Various Soil virgin and cultivated virgin samples virgin soils excelled Virginia weeks widely