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: Pengaruh Pemberian Pupuk Organik pada Produksi dan Serapan Hara Jagung Manis (Zea mays) di Latosol, Darmaga
Abstrak: There are two form of organic fertilizers, solid and liquid. Solid organic fertilizer is usually applied to the soil. The advantage in application of organic fertilizers able to adsorb nutrients that easily lost and supply availability of nutrients and therefore can increase efficiency of fertilizer. The purpose of this study was to study the effect of organic fertilizer application on Latosol, Darmaga to production and nutrient uptake of corn as plant indicator. The experiment was conducted in the greenhouse by using completely randomized design consisting of seven treatments and each treatment was repeated four times so that there were 28 pot experiments. Seven treatments were consisted of control, standard, 75% PO + 50% S, 75% PO + 75% S; 100% PO + 50% S; 100% PO + 75% S, and 125% PO + 50% S. The parameters measured were plant height, weight of shoot, root weight, ear weight with and without cornhusk, uptake of N, P, and K nutrients in shoot and plant roots and the Corganic content, N-total, and CEC (cation exchange capacity) soil after the experiment. The result of experiment showed that the application of organic and anorganic (standard) fertilizer on plant height and weight of shoot was not significantly different than standard fertilizer (100% S). The weight of plant roots and nutrient uptake of N, P, and K of the shoot and plant roots in the treatment of 100% PO + 75% S was significantly higher than other treatments. Treatment combination of organic and anorganic (standard) fertilizer at the lower doses of standard recommendation significantly increased ear weight with and without cornhusk. Dosage recommendations based on the RAE value are the treatment of 100%PO + 50%S (158,66%) and 75%PO + 50%S (142,52%). The analysis of soil after the experiment showed that the use of organic fertilizer combined with anorganic fertilizer (standard) produced levels of C-organic, N-total, and the CEC soils tend to be higher than the standard (100% S) and control treatments. The use of organic fertilizer combined with anorganic (standard) fertilizer at lower doses (50% S and 75% S) increased effectiveness of fertilizer to increase the growth and production of corn.
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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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