PENGARUH MIMBA (Azadirachta indica, A. Juss) SEBAGAI PELAPIS PUPUK NPK TERHADAP POPULASI BAKTERI PENGOKSIDASI NITRIT DAN N TERLINDI DI TANAH PASIRAN PADA BERBAGAI LAMA INKUBASI

• Main Authors: , HAMIDAH NURUL AINI AS, , Dr. Ir. Abdul Syukur, SU.
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2011
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/89322/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=51876
• Institution: Universitas Gadjah Mada

The aim of this research were to know effect of either concentration of mimba extract coating or mimba powder on nitrite oxidizier bacteria population and total of N-leached in sandy soil at different length of incubation. Design of experiment used was factorial, arranged in complete randomized design (CRD), consisted of three factors there were concentration of mimba extract coating (consentration levels are 10 %, 20 %, and 30%), and rate of mimba powder composed with KPN fertilizer (dosis levels are 1.3 g equivalent with mimba extract at 10%, dosis levels are 2.6 g equivalent with mimba extract at 20%, dosis levels are 4.0 g equivalent with mimba extract at 30%), and length of incubation (7,14,21, and 28 days ). The results showed that increasing of either mimba extract coating concentration or rate of mimba powder decreased. Either nitrite oxidizier bacteria population or total of N-leached. At equivalent level, effect of mimba extract on the parameters was more significant compare to mimba powder, increasing of incubation length decreased the parameters. The lowest either nitrite oxidizier bacteria population or total of N-leached was resulted at application of 30 % mimba extract at 14 days incubation.