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"The aim of this study was to know the effects of legin application,NPK (15;15;15) and urea fertilizer on peat soils on the shoot total N,P content and nodule development of soybean (Glycine max (L)Merr.) ...."

"Kekurangan persediaan bahan baku produksi dapat mengakibatkan produksi terhenti sehingga perusahaan tidak maksimal dalam menghasilkan produk. Pada umumnya, perusahaan-perusahaan yang mengalami hal ini akan mengambil langkah antisipasi dengan membuat sistem safety stock, namun berbeda halnya jika bahan baku tersebut memiliki karakteristik yang mudah rusak, seperti bahan yang bersifat kimiawi. Bahan baku yang bersifat kimiawi memiliki daya simpan yang singkat sehingga perusahaan harus mempertimbangkan risiko bahan baku tersebut rusak sebelum digunakan jika ingin menyediakan stok.Penelitian ini bertujuan merancang suatu sistem yang dapat menangani permasalahan kekurangan bahan baku yang memiliki daya simpan yang singkat di pabrik pupuk NPK. Peneliti membuat sistem safety stock untuk mengantisipasi ketidakpastian kedatangan bahan baku serta merancang simulasi yang dapat membantu perusahaan dalam menentukan production rate yang terbaik untuk mengolah persediaan bahan baku sehingga dapat mencegah bahan baku menjadi rusak sebelum digunakan.Hasil penelitian ini adalah terciptanya suatu sistem yang dapat membantu perusahaan dalam penyediaan bahan baku, mengurangi risiko kerusakan bahan baku, serta meningkatkan jumlah produksi.

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Shortage production of raw material inventory can lead to production stops, so the company was not optimal in producing the product. In general, companies that experienced this would take anticipatory steps to create a system of safety stock, but unlike the case if the raw material has characteristics that are easily damaged, such as materials that are chemical. Raw materials that are chemical has a short shelf life so the company should consider the risks of raw material is broken prior to use if we want to provide the stock.

This research aims to design a system that can handle the problems of shortage of raw materials which have a short shelf life in NPK fertilizer plant. Researchers create a system of safety stock in anticipation of the uncertainty of raw material arrival and to design simulations that can help companies determine the best production rate to process raw materials inventory in order to prevent the raw materials become damaged before use.

The results of this research is to create a system that can help companies in the supply of raw materials, reducing the risk of damage to raw materials, and increasing the amount of production."

"Karakterisasi tanah dan air yang meliputi pengambilan sampel tanah dan analisis laboratorium penting dilakukan dalam upaya pencegahan pencemaran lingkungan yang disebabkan oleh produksi pertanian secara intensif. Pengukuran resistivitas listrik tanah skala laboratorium dengan metode empat elektrode telah dilakukan untuk menganalisis pengaruh saturasi fluida terhadap resistivitas listrik tanah. Delapan sampel tanah disiapkan untuk pengukuran resistivitas listrik dengan menginjeksikan larutan pupuk kompos dengan konsentrasi larutan 28,6%, urea dengan konsentrasi larutan 0,013%; 0,022%; 0,038%, NPK dengan konsentrasi larutan 0,013%; 0,022%; 0,038% , serta akuades pada sampel tanah dengan tingkat saturasi 4%-100% dari volume porinya. Pengukuran estimasi sifat fisika-kimia fluida seperti resistivitas listrik larutan, TDS, salt, dan pH dari larutan pupuk juga dilakukan menggunakan alat water quality meter untuk dianalisis pengaruhnya terhadap resistivitas listrik tanah. Hasil menunjukkan, pada seluruh variasi konsentrasi larutan memiliki pola yang sama, penurunan resistivitas listrik terjadi seiring dengan bertambahnya saturasi fluida hingga pada saturasi fluida 80-90%. Setelah melewati saturasi tersebut, nilai resistivitas tanah cenderung konstan. Hubungan resistivitas listrik tanah dan saturasi fluida juga dijelaskan mengikuti Hukum Archie, diperoleh a = 0,7164-0,9149 dan eksponen saturasi (n) = 2,312-3,496 dengan koefisiden determinasi (R2) = 0,9187-0,9565. Sifat fisika-kimia dari larutan pupuk juga berkontribusi terhadap perbedaan nilai resistivitas listrik tanah. Dari penelitian ini diharapkan dapat menjadi referensi untuk memprediksi saturasi air pada suatu lahan serta menentukan zona batas toleransi tanaman terhadap salinitas.

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Soil and water characterization is important in preventing environmental pollution caused by intensive agricultural production. Laboratory-scale soil electrical resistivity measurements using the four-electrode method have been carried out to analyze the effect of fluid saturation on the soil electrical resistivity. Eight soil samples were prepared for the measurement of electrical resistivity by injecting a solution of compost (solution concentration = 28.6%), urea (solution concentrations = 0.013%; 0.022%; 0.038, NPK (solution concentrations = 0.013%; 0.022%; 0.038%) and distilled water in soil samples with a saturation level of 4%-100%. Measurements of the estimation of the physico-chemical properties of the fluid such as the electrical resistivity, TDS, salt, and pH of the fertilizer solution using a water quality meter were also carried out to analyze the effect on the electrical resistivity of the soil. The results show that the electrical resistivity of the soil decreases along with the increase in fluid saturation until the fluid saturation is 80-90% at all solution concentrations. After passing through the saturation, the electrical resistivity of the soil tends to be constant. The relationship between the soil electrical resistivity and the saturation of the fluid is also explained according to Archie's Law, obtained a = 0,7164-0,9149 and the saturation exponent (n) = 2,312- 3,496 with coefficient of determination (R2) = 0,9187-0,9565. The physico-chemical properties of the fertilizer solution also contribute to the difference in the electrical resistivity of the soil. This research is expected to be a reference for predicting water saturation in agricultural land and determining the tolerance zone of plants to salinity."

"The objectives of this research were (i) to identity the ffects of combination of compound fertilizers of NPK (25:7:7) and package NPK (10:55:10) on vegetative growth Adenium obesum in stead of Japanese frangipani plant, and (ii) to obtain the best combination of dose of NPK (25:7:7) and package NPK (10:55:10) in order to improve plant vegetative growth of Adenium obesum. This expreriment was conducted in employed completely random design with factorial pattern of 4x4 and three times repetition. Factor I, the dose of NPK (25:7:7) fertilizer in 4 levels of dose: 0.0 g/L; 0.5 g/L; 1.0 g/L; and 1.5 g/L. Meanwhile, factor II, the dose of package NPK (10:55:10) was applied with 4 levels of dose: 0.0 g/L; 0.5 g/L; 1.0 g/L; and 1.5 g/L. The data obtained were analyzed using variance analysis (ANOVA) technique to identity the influence of the treatment towards variables measured and mean separation was evaluated using DMRT with 5% level of difference. The results show that the use of combination of compound fertilizers NPK (25:7:7) and package NPK (10:55:10) improves plant vegetative growth of Adenium obesum. However, the use of combination of NPK 0.0 g/L and package NPK 0.5 g/L shows unsatisfactory results. The cobination of NPK .5 g/L and package NPK 1.5 g/L provides the best result in improving plant vegetative growth of Adenium obesum."