Effect of organic and inorganic nitrogen sources on growth, yield and oil content of sunflower grown in highly weathered soils of Morogoro Author/Editor(s): Irika, Mwahija Almasi Date of publication: 2015RUFORUM Theses and Dissertations Read more about Effect of organic and inorganic nitrogen sources on growth, yield and oil content of sunflower grown in highly weathered soils of Morogoro