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Sastrosupadi, Adji and ,, Widowati and Krismawati, Amik Buku Prinsip-Prinsip Agronomi Dengan Hasil-Hasil di Indonesia. Universitas Negeri Malang, Malang. ISBN 978-602-470-074-4
,, Widowati and Astutik, Astutik and Astri, Sumiati and Fikrinda, Wahyu Similarity Residual effect of potassium fertilizer and biochar on growth and yield of maize in the second season. International Research Centre for the Management of Degraded and Mining Lands (IRC-MEDMIND), Malang.