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Hubungan Kandungan Hara Tanah dan Produksi Gambir di Sumatera Barat Kurnia Dewi Sasmita; Bambang Eka Tjahjana
Jurnal Tanaman Industri dan Penyegar Vol 2, No 3 (2011): Buletin Riset Tanaman Rempah dan Aneka Tanaman Industri
Publisher : Pusat Penelitian dan Pengembangan Perkebunan

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Abstract

Gambier (Uncaria gambir Roxb.) is a useful plant, especially for for the pharmaceutical industry. Productivity of gambier is still low because one of them caused by low soil fertility in cropping areas gambier. This study aimed to determine the relationship of soil nutrient content, nutrient content of plant and crop production of gambier at the one of production centers in West Sumatra for the basis of determined fertilizer needs of gambier. The experiment was conducted with a random sampling method on the plot owned by farmers in the Kampung Koto Marapat, West Sumatra.The results showed that each ton of dry leaves of gambier will take the nutrients of 19.8 kg N, 1.3 kg P and 13.6 kg K. High yield crops need nutrients at 452 kg N / ha, 30 kg P / ha and 296 kg K / ha with population 2500 plants / ha. The high production of gambier is not indicated significantly by high levels of NPK nutrients in leaf and high soil nutrient levels. Low pH was one factor limiting the production of gambier.
Pengaruh Pupuk Majemuk NPK dan Fosfat terhadap Pertumbuhan dan Produksi Jarak Pagar IP3-P Kurnia Dewi Sasmita; Dibyo Pranowo
Jurnal Tanaman Industri dan Penyegar Vol 2, No 3 (2011): Buletin Riset Tanaman Rempah dan Aneka Tanaman Industri
Publisher : Pusat Penelitian dan Pengembangan Perkebunan

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Abstract

Jatropha curcas was one of raw alternative material to produce bio fuel. Production of Jatropha require fertilizers in order to optimalize input usage. This research to determine dose of NPK (15:15:15) and fosfat fertilizers for growth and production of Jatropha curcas L provenan IP3-P. The research was conducted at Jatropa curcas main garden, Pakuwon, Sukabumi in March to December 2009. The design environment used Random Block Design (RBD)  arranged in factorial and repeated 3 replications. The first factor was dose of NPK fertilizers i.e : 0, 60, 120, 240, 360 g/tree/year, and comparator dose 40 g urea/tree/year, 110 g SP-36/tree/year, 30 g KCl/tree/year. Second factor was dose of P fertilizers i. e. : 0, 10, 17, 24 g P/tree/year. The result showed that 360 g NPK fertilizers/tree/years application significantly increases vegetative growth on number of branch and diameters of stem. The best dose of fosfat fertilizer for vegetative growth was 17 g/tree/year. Combination of NPK fertilizers with dose 240 g/tree/year and 17 g P fertilizer/tree/year increases significantly wight of fresh fruit and wight of dry fruit at 6 month of tree age.
Co-Authors Bambang Eka Tjahjana Dibyo Pranowo