Judul: The Effectivity of Granule Organic Fertilizers on Production and Nutrients Uptake of Sweet Corn (Zea mays L. Saccharata) and Chemical Properties of Latosol Darmaga
Abstrak: Fertilizer application to the soil is an effort to increase the production of sweet corn. Farmers in Indonesia often use inorganic fertilizers to overcome the problem of nutrients deficiency and it is immediately available in soil and easily absorbed by plants thus increasing productivity of sweet corn. The continuous application of inorganic fertilizers can cause deterioration of physical, chemical, and biological soil properties and can result in environmental pollution. Therefore, the use of organic fertilizers are expecting to be able to improve the quality and quantity of crop production, reduce environmental pollution, and improve the soil quality. Research on the utilization of organic fertilizer in combination with inorganic or chemical fertilizer might be a solution to increase crop production and to improve soil fertility, and to reduce the use of inorganic fertilizer. This study aimed to test the effectiveness of granule organic fertilizer on sweet corn production and nutrients uptake of sweet corn (Zea mays L. Saccharata) and chemical properties of Latosol Darmaga. This research used Completely Randomized Design (CRD) with seven treatments and four replications, namely: control, standard (S) or inorganic fertilizer, 75%PO+50%S, 75%PO+75%S, 100%PO+50%S, 100%PO+75%S, and 125%PO+50%S. The results showed that combination of treatment of fertilizers on the height of sweet corn plant at 4 weeks after planting, the fresh-weight of shoot, ear weight, and N, P, K uptake were significantly higher than control treatment. Based on the result of some plant parameters observed and the value of relative agronomic effectiveness (RAE), the best treatment was treatment of 75%PO +50%S. This showed that organic fertilizer which being in combination with lower dose inorganic fertilizer was effective in improving the observed parameters. The treatment of organic fertilizer in combination with inorganic fertilizer resulted in higher cation exchange capacity (CEC) of soil than unfertilized treatment (control) and solely application of inorganic fertilizer. The highest value of soil CEC was happened in treatment of 75% PO+50% S. The content of soil Corganik and total N were not significant difference.
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Judul: Efektivitas Pupuk Organik terhadap Pertumbuhan, Produksi, dan Kadar Hara NPK Daun Jagung Manis di Latosol Darmaga
Abstrak: Sweet corn is seed plant which is commonly planted in Indonesia because of it's sweet taste and contain high carbohydrate. One of the problems in cultivation of sweet corn is low soil fertility, due to the lack of soil nutrient availability and organic matter. To solve that problem can be done by applying organic and anorganic fertilizers. Organic fertilizer is able to increase chemical fertilizer efficiency through improving of physical, chemical and biological of soil. So it is expected to increase the production of plant significantly. The objective of this research is to study the effectiveness of organic fertilizers that was combined with inorganic fertilizer on the growth, production, and N, P, K content of sweet corn leaf in Latosol Darmaga. The field experiment was conducted at the University Farm IPB and plant analisis in the laboratory of soil chemistry and fertility, Department of soil science and Land Resources Faculty of Agriculture IPB. The materials used were organic fertilizers, inorganic fertilizers, seeds of sweet corn (Seleksi Darmaga III), furadan, and agricultural lime. The design of the experiment was a randomized complete block design (RCBD) with a single treatment consisted of 7 treatments which was repeated 3 times each, so there were 21 experimental units. Those seven treatments were: (1) control, (2) Standard (S), (3) 0.5 S + 1.5 PO, (4) 0.5 S + 1 PO, (5) 0.75 S + 1 PO, (6) 1 S + 1 PO and (7) 0.75 S + 1.5 PO. The parameters measured were plant height, production (corn cobs weight including the cornhusk and stover weight), and N-, P-, K-content of corn leaf. The results of this research showed that additional of organic fertilizer with inorganic fertilizer was effective in improving the growth, production, and N, P, K content of sweet corn leaf. The production for treatment 1 S + 1 PO was 14.31 t/ha greater (2.37 t/ha) than standard treatment, and 11.81 t/ha greater than control treatment (no fertilizer application).
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Judul: Pengembangan model markov tersembunyi pada identifikasi pembicara
Abstrak: Model Markov Tersembunyi merupakan suatu model yang tersusun dari dua buah proses stokastik, yaitu rantai Markov untuk menampung kemajuan temporal dan proses yang teramati untuk menampung variasi akustik. Model ini dapat digunakan sebagai metode pencocokan pola pada sistem identifikasi pembicaraan. Setiap model mewakili referensi pola dari seorang pembicara di dalam sistem identifikasi pembicara.
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