Pola Respon Spektral Jagung pada Berbagai Perlakuan Pemupukan dan Kenampakannya pada Citra Drone RGB
Date
2022-06-21Author
Fajar, Arival Al
Ardiansyah, Muhammad
Nugroho, Budi
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Kondisi fisik tanaman jagung berkaitan erat dengan kandungan hara N dan dapat diidentifikasi dengan analisis laboratorium, spektroradiometer, atau citra drone. Penelitian ini bertujuan untuk mengindentifikasi, membandingkan karakteristik pola respon spektral, dan menduga kadar-N daun jagung pada berbagai perlakuan pemupukan dan fase pertumbuhan yang diperoleh dari pengukuran spektroradiometer dan drone. Pengamatan reflektan jagung dilakukan mulai umur 2 – 10 MST (minggu setelah tanam) menggunakan alat spektroradiometer. Selain itu, pengamatan kadar-N dilakukan pada tanaman umur 4 dan 8 MST. Citra drone diolah menjadi indeks ExR (Excess Red Vegetation) dan GRVI (Green Red Vegetation Index). Hasil penelitian menunjukkan bahwa karakteristik reflektan perlakuan pemupukan jagung mempunyai kesamaan pada panjang gelombang cahaya tampak. Perbedaan karakteristik reflektan pada berbagai perlakuan pemupukan terlihat jelas pada rentang red edge dan NIR. Nilai reflektan pada rentang red edge dan NIR terus meningkat sejalan dengan bertambahnya umur tanaman, nilai reflektan tertinggi berada pada umur 8 MST dan nilai reflektan mulai turun sesudahnya. Nilai reflektan pada gelombang merah, hijau, dan red-edge mempunyai hubungan yang baik dengan kadar-N, sedangkan hubungan gelombang NIR korelasi dengan kadar-N sangat rendah. Indeks ExR dan GRVI tidak menunjukkan karakteristik spektral yang berbeda pada berbagai perlakuan pemupukan. The physical condition of corn plants is closely related to the nutrient N content and can be identified by laboratory analysis, spectroradiometer, or drone imagery. This study aims to identify, compare the characteristics of the spectral response pattern, and estimate the N content of corn leaves at various fertilization treatments and growth phases obtained from spectroradiometer and drone measurements. Observation of the reflectance of corn plants was carried out from the age of 2-10 week after planting using a spectroradiometer. In addition, observations of N-levels were carried out on plants aged 4 and 8 Weeks After Planting. Drone images are processed into ExR (Excess Red Vegetation) and GRVI (Green Red Vegetation Index) indexes. The results showed that the reflectance characteristics of the maize fertilization treatment were similar in the visible light wavelength. The difference in reflectance characteristics in various fertilization treatments was clearly visible in the red edge and NIR ranges. The reflectance value in the red edge and NIR ranges continued to increase in line with the age of the plant, the highest reflectance value was at 8 Weeks After Planting and the reflectance value began to decline after that. The reflectance values in the red, green, and red-edge waves have a good relation with the N-level. In the NIR wave the relation with the N-level is very low, this is because the NIR wave does not need chlorophyll so that it is reflected back. The ExR index and the GRVI index did not show different spectral characteristics in various fertilization treatments.