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  <controlfield tag="008">210402s9999    xx            000 0 und d</controlfield>
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   <subfield code="b">(Chuyên ngành: Khoa học đất)</subfield>
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   <subfield code="c">Phạm Thị Phương Thuý ; Nguyễn Ngọc Đệ, Nguyễn Thị Kim Chung giáo viên hướng dẫn</subfield>
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   <subfield code="a">Nội dung đề tài nghiên cứu nồng độ pH, thành phần Al, Fe, P trên đất phèn, đất xám bạc màu, đất đỏ Bazan và đất phù sa. Đánh giá ảnh hưởng của liều lượng phân hữu cơ lên thành phần pH, và sinh trưởng của cây bắp trồng trên đất phèn.</subfield>
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