Kesuburan tanah merupakan komponen dasar untuk menghasilkan produk pertanian yang berkualitas sehingga petani menikmati hasilnya yang telah diperjuangkannya terus menerus. Oleh karena itu, dibuatlah sebuah alat untuk membantu masyarakat dalam proses pengolahan pertanian salah satunya dengan menghasilkan sebuah alat pendeteksi kesuburan tanah selama petani menggarap. Alat yang dibuat dengan cara yang sangat sederhana dengan menggunakan bola lampu 100 watt, pipa ukuran 1 inci, T pipa, colokan 2, 2 buah kabel listrik isi satu (Merah 1 meter hitam 2 meter), Fitting lampu, lem, plester/ lakban. Alat cek kesuburan Tanah dibikin sebanyak 2 buah. Prinsip kerja dari alat ini menggunakan prinsip hukum ohm (Ω), dimana ketika suatu media memiliki nilai hambatan yang kecil maka tegangan listrik yang dihantarkannya. Apabila kation ini banyak terdapat ditanah maka tanah tersebut dapat dikatakan subur. Tetapi sebaliknya apabila lampu menyala redup atau tidak menyala maka nilai penghantar yang terdapat ditanah tersebut bernilai kecil, dan tanah tersebut dapat dikatakan tidak subur. Pelaksanaan demonstrasi alat pengecek kesuburan tanah ini dilaksanakan secara langsung ke kelompok-kelompok tani yang ada di daerah sawah bukit, Kota Solok. Pelaksanaan demonstrasi pembuatan alat ini diharapkan dapat memberikan informasi kepada kelompok tani bagaimana pembuatan alat sederhana dan pengecekan tanah mereka dengan tanpa harus membeli alat pengukur PH tanah yang mahal. Poin utama yang disampaikan: pengertian kesuburan tanah dan demonstrasi cara pembuatan alat pengecek kesuburan tanah sederhana.
Mg-1.6 Gd alloy ingot were prepared by hot extrusion. The extruded alloy exhibits the recrystallised grain size and excellent mechanical properties. The aim of this study is to explore the microstructure and mechanical properties of extruded Mg-1.6 Gd to be used as implant. Extrusion was performed at temperatures of 400°C, 450 °C, 500°C and 550°C with a speed of 1mm/s and extrusion ratio of 30%. Tension and hardness testing were carried out on samples taken from extruded rod of Mg-Gd alloy. Microstructure observation revealed that all extruded alloy specimens constitued of finer grain size (~14 um) compared to that of the as-cast alloy (> 500 um) as the result of full recrystallization occured at 400 °C. The grain size increased larger with an increase temperature and the peak value is 25mm at temperature of 550 °C. Hardness of the alloy decreased as the extrusion temperature increased from 48.7 HV at 400 °C to 42 HV at 550 °C which is associated with the change in the grain size. Tensile strengths were not apparently affected by the temperature change, however, it was observed that the tensile and yield strengths dropped at 500 °C. Meanwhile, the elongation decreased with increasing temperature which reached 24 % at the lowest temperature. Detailed explaination of the relationship of microstructure and mechanical properties is discussed in this paper.
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