Judul: Design of Android-Based Metering Device Control Prototype and Data Recording System on Variable Rate Precision Fertilizer Machine 4.0 for Paddy Field
Abstrak: Salah satu kunci teknologi dalam implementasi pertanian presisi adalah peralatan yang mampu menjalankan rekomendasi keputusan dari suatu sistem pengambilan keputusan (decision support system) bagi tata kelola pertanian modern untuk mengoptimalkan penggunaan input produksi (dalam hal ini pupuk) guna mendapatkan hasil panen yang optimal namun tetap menjaga lingkungan. Konsep pemupukan yang digunakan pada pertanian presisi adalah Variable Rate Application, dimana variabilitas spatial dan temporal dikelola agar pemberian pupuk sesuai dengan dosis, tepat waktu dan tepat lokasi. Tujuan dari penelitian ini adalah merancang, mengembangkan dan menguji coba prototipe kontrol metering device dan sistem perekaman data berbasis android pada pemupuk VRT yang mampu mengatur dosis pupuk secara presisi sesuai peta pemupukan. Pengujian prototipe ini meliputi pengujian stasioner dan pengujian di lahan. Sistem posisi di lahan memanfaatkan RTK-DGPS dengan ketelitian 5-10 cm. dst ...
Keyword: Variable rate technology, precision fertilization, control PID, precision farming, android based recording

Judul: Desain dan Pengujian Prototipe Mesin Pemupuk Butiran Laju Variabel Empat Baris untuk Pertanian Presisi
Abstrak: In conventional method, fertilizer is applied at a uniform dosage for all location of a field. However, each location within the field needs different amount of fertilizer according to the soil nutrient content and growth condition of crop. For that purpose, it is important to develop a fertilizer applicator that allows a prescribe rate of fertilizer to be applied at each location within the field, based on recommended dose. The objectives of this research were: 1) to design digital metering system to control the application rate of a variable rate granular fertilizer applicator, 2) to develop a prototype of 4 rows granular fertilizer applicator, that can provide prescribe application rate automatically, and 3) to obtain field performance data of the prototype. A prototype of the variable rate granular fertilizer applicator was designed and constructed.The metering device consisted of two fluted wheel type of rotors which was driven by controlled DC-motor. To provide a prescribe rate of fertilizer, a control system based on microcontroller DT-AVR ATmega128L modul was developed and set to control the speed of the rotor. The prototype then was tested using three types of granular fertilizers (Urea, SP-36 and NPK), on stationary test and field tests. The stationary test result showed that the PID controller could control and provided a proportional correlation between application rate and rotor speed. The field performance test result showed that the designed prototype could provide a proper predetermined application rate of fertilizers precisely. The average deviations of the application rate for 50, 100, 150, 200, 250 kg/ha dose of Urea were -1.67 , 3.33, 0.28, 2.71 and 1.33 % respectively. For SP-36 were -21.67, -5.42, -2.47, -2.71, and -1.67 %. respectively. For NPK were -18.33, -4.17, -4.17, -3.75 and -2.33 % respectively.
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Judul: Light Microscope Study of ConnectiveTissue in The Spleen of Common Rousette Bat (Rousettus amplexicaudatus)
Abstrak: The spleen is the largest lymphoid organ. As a secondary lymphoid organ, in addition to its immune function, the spleen also has functions as blood filtration, storage, and hematopoiesis. The spleen has different morphologies between species that support different physiological functions, one of which is the difference in the structure of the capsule and trabeculae. Capsule and trabeculae of the spleen generally consist of connective tissue and smooth muscle. The thickness of smooth muscle composed together with connective tissue in the capsule and trabecula determines the function of the spleen that is divided spleen into three storage, defense, and intermediate. Bats are the reservoir of various zoonotic diseases. Bats are thought to have unique immune systems compared to other mammals but the characteristics of its immune organs such as the spleen have never been studied before. This study was conducted to examine the characteristics of capsulae and trabecula of the Common Rousette (Rousettus amplexicaudatus).
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