Judul: Development of Non-Destructive Leaf Chlorophyll Content Prediction Device Based on Multi-Channel Visible Light Sensor
Abstrak: Pendugaan kandungan klorofil yang tersedia saat ini sangat mahal dan sulit dijangkau petani menengah ke bawah. Pendugaan klorofil penting untuk mengetahui kebutuhan pupuk nitrogen yang dibutuhkan tanaman. Penelitian ini bertujuan mengembangkan alat penduga kandungan klorofil yang murah sebagai alternatif SPAD-502Plus. Alat yang dikembangkan menggunakan sensor AS7262 dan Arduino UNO sebagai mikrokontroler. Proses kalibrasi alat dilakukan dengan membandingkan hasil pembacaan sensor AS7262 dengan hasil pengukuran chlorophyll meter SPAD-502Plus Konica Minolta. Proses kalibrasi dilakukan menggunakan sampel berupa daun kopi, cabai, dan kakao masing-masing 200 lembar. Hasil kalibrasi menunjukkan adanya korelasi antara nilai SPAD dengan nilai sensor, terlebih pada channel kuning. Dilakukan analisa dengan dua metode, single channel dan multi-linear regression. Masing-masing metode menghasilkan empat persamaan yang kemudian disematkan dalam program Arduino dan dilakukan pengujian alat. Pengujian dilakukan pada delapan persamaan menggunakan sampel daun masing-masing 50 lembar daun. Pengujian pada persamaan hasil analisa multi-linear regression menghasilkan hasil yang terbaik. Pengujian persamaan kopi menghasilkan R2 = 0,9872; RMSE = 1,79; dan MAPE = 2,90%. Pengujian persamaan cabai menghasilkan R2 = 0,9725; RMSE=1,57; dan MAPE = 3,76%. Pengujian persamaan kakao menghasilkan R2 = 0,9828; RMSE = 1,40; dan MAPE = 3,32%. Pengujian persamaan untuk tanaman umum menghasilkan R2 = 0,9518; RMSE = 3,16; dan MAPE = 7,04%. Seluruh pengujian mengindikasikan pendugaan kandungan klorofil menggunakan alat yang dikembangkan pada penelitian ini sangat akurat., The present techniques for estimating chlorophyll content come with a high price tag and present formidable obstacles for farmers from middle to lower socioeconomic backgrounds. Chlorophyll estimation is important to determine the nitrogen fertilizer requirements needed by plants. This research aims to develop a cheap chlorophyll content estimator as an alternative to SPAD-502Plus. The developed tool uses AS7262 sensor and Arduino UNO as a microcontroller. The tool calibration process is done by comparing the AS7262 sensor reading results with the measurement results of the SPAD-502Plus Konica Minolta chlorophyll meter. The calibration process was carried out using 200 samples of coffee, chili, and cocoa leaves each. Calibration results show a correlation between SPAD values and sensor values, especially in the yellow channel. The data were analyzed using two methods, single channel and multilinear regression. Each method produces four equation models which are then embedded in the Arduino program and tested. Tests were conducted on eight equations using leaf samples of 50 leaves each. Testing on the equation of multilinear regression analysis results in the best results. Testing the coffee equation produced R2 = 0.9872; RMSE = 1.79; and MAPE = 2.90%. Testing the chili pepper equation resulted in R2 = 0.9725; RMSE = 1.57; and MAPE = 3.76%. Testing the cocoa equation resulted in R2 = 0.9828; RMSE = 1.40; and MAPE = 3.32%. Testing the equation for general crops resulted in R2 = 0.9518; RMSE = 3.16; and MAPE = 7.04%. All tests indicated that the estimation of chlorophyll content using the tool developed in this study was very accurate.
Keyword: Klorofil, Daun, SPAD-502, Sensor AS7262

Judul: Rancang Bangun Alat Elektronik Pengukur Indeks Warna Daun Padi Untuk Rekomendasi Pemupukan Nitrogen
Abstrak: Nondestructive nitrogen monitoring for rice leaf is necessary for applying site specific nitrogen recommendation. Electronic SPAD chlorophyll meter device from Konica Minolta and IRRI-Leaf Color Chart now is the most known tools for measuring rice leaf index which have correlated reading with leaf nitrogen content. Both device is using leaf color properties principles to gave index value for estimating leaf nitrogen content. In this research, a new Prototype of leaf color measurement portable device has been build using TAOS TCS230 RGB Color Sensor. This device is using white LED light source to get reflection from rice leaf. Value read from sensor within range 400-600 nm will be processed in microcontroller to gave color value, leaf index and nitrogen fertilizer amount to be applied in the rice field. Performance test result indicate that the device has worked well on distinguishing colors as calibrated with GretagMacbeth color patch. Using BWD calibration the devices display XYZ and RGB color value as well as the BWD unit and fertilizer recommendation.
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Judul: Perilaku Reproduksi dan Karakteristik Mikrohabitat tempat Bertelur Burung Gosong (Megapodius reinwardtii Dummont 1823) Di Taman Buru Pulau Moyo
Abstrak: Burung gasang (Megapodius reinwardtii) merupakan jenis burung terestrial yang selalu berpasangan sepanjang hidupnya. Burung ini dilindungi berdasarkan SK Menteri Kehutanan No. 882/Kpts-II/1992 tanggal 28 September 1992. Penyebaran satwa ini hanya terbatas di wilayah Indonesia bagian timur.
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