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Bertham, Rr. Yudhy Harini and Abimanyu D. , Nusantara and Usman, Siswanto (2013) Growth Of Artemisia Annua, Artemisinin Synthesis, And Arbuscular Mycorrhizal Fungus Colonization AS Affected By Accssion And Fertilization. In: Program Book The 3rd International Symposium for Sustainable Humanosphere (ISSH). University of Bengkulu, Bengkulu, pp. 1-7.
Yahumri, Yahumri and Usman, Siswanto and Purwanto, Purwanto (2007) PENGARUH SAAT PEMANGKASAN DAN VARIBTAS TERIIADAP KEBERIIASILAN OKULASI BIBIT MANGGA UMUR SATU TAHUN. Undergraduated thesis, Fakultas Pertanian UNIB.
Handajaningsih, Merakati and Usman , Siswanto and Teguh , Adiprasetyo and Hidayat , Hidayat and Bambang , Purnomo and Marwanto, Marwanto and Lisa, Nuri THE SUITABILITY OF DIFFERENT SOURCES OF BIOFERTILIZERS TO SUPPORT SUSTAINABILITY OF ORGANIC VEGETABLES PRACTICE IN BENGKULU PROVINCE OF INDONESIA. In: Proceeding ISEPROLOCAL. Badan Penerbitan Fakultas Pertanian Universitas Bengkulu, Bengkulu, Indonesia, pp. 250-253. ISBN 9786029071184
