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Kandungan Nitrogen dan Bobot Biji Kentang yang Diberi Pupuk Organik Difermentasi, Azospirillum sp., dan Pupuk Nitrogen di Cisarua, Lembang, Jawa Barat

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Author(s): Nurmayulis | Maryati

Journal: Jurnal Tanah Tropika
ISSN 0852-257X

Volume: 13;
Issue: 3;
Start page: 217;
Date: 2008;
Original page

Keywords: Azospirillum sp. | fermented organic matter | nitrogen fertilizer | potato

ABSTRACT
A research was conducted to study response of potato (Solanum tuberosum L.) plant to the application of fermented organic matter (‘porasi’) (0, 7.5, 15.0, and 22.5 t ha-1), without or with inoculation of Azospirillum sp., and N fertilizer (0, 86, 172, and 258 kg ha-1 N) and also to determine optimal rate of application of ‘porasi’ and N fertilizer without or with inoculant Azospirillum sp. Field experiments were carried out in Cisarua, Lembang West Java, from June to November 2003. The experiments were done in a Randomized Block Design of factorial pattern of three factors, were replicated three times. Results of the experiments showed that: (1) N contents were higher as rates of ‘porasi’ and N fertilizer increased and with inoculation of Azospirillum sp., whereas the highest N concentration was obtained due to application of 22.5 t ha-1 ‘porasi’ with inoculation of Azospirillum sp. and application of N fertilizer of 258 kg ha-1, and (2) the optimum rate of ‘porasi’ and N fertilizer without inoculation of Azospirillum sp. was 15.287 t ha-1 and 228.519 kg ha-1 N, respectively, to obtain maximum yield of 6.028 kg per plot or 25.117 t ha-1, whereas with inoculation of Azospirillum sp. the optimum rate of ‘porasi’ and N fertilizer was 16.464 t ha-1 and 190.110 kg ha-1 N, respectively, with maximum yield of 6.493 kg per plot or 27.054 t ha-1.
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