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Pengelolaan Hara pada Budidaya Tumpangsari Sayuran Organik : Pertumbuhan dan Serapan Kalsium (Ca) dan Magnesium (Mg) Tanaman Brokoli (Brassica oleracea) dan Petsai (Brassica pekinensis) Akibat Pemberian Beberapa Pupuk Organik