Sahirman, Sidharta
Fakultas Biologi | Universitas Jenderal Soedirman

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Variasi Intersepsi Cahaya dan Model Pendugaan Biomassa Tanaman Bayam Merah (Amaranthus gangeticus) dalam Sistem Plant-Factory

Jurnal Keteknikan Pertanian Vol 6, No 3 (2018): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

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AbstractArtificial lighting given in plant-factory planting system is inseparable from uniformity problem. Spatial variation in the catch of light (radiation) will occur due to the position of the plant against the lamp. The purpose of this research was; a) to determine the relationship between biomass growth and the intensity of artificial irradiation in plant-factory systems, and b) to apply the mechanical model of plant growth basedon radiation interception and temperature. Six boxes containing red spinach plants were placed on plant factory system in the form of two racks (each rack is placed 3 boxes). In each box, intercepted light was measured and then converted to radiation value. The air temperature in plant-factory space was measured during growth to harvest. Observations showed that there was a difference in light interception in plantfactorygrowing spaces that caused variations in plant biomass growth. Mathematical models were used to predict the relationship between light interception and biomass growth. This research concludes that the variation of light occurring in plant-factory planting cannot be ignored, as this leads to markedly different plant-end biomass differences. Modeling can be applied to design optimal lighting to improve plant biomass.AbstrakPencahayaan buatan yang diberikan dalam sistem penanaman dalam ruang (plant factory) tidak terlepas dari masalah keseragaman. Variasi spasial dalam tangkapan cahaya (radiasi) akan terjadi karena posisi tanaman terhadap lampu. Tujuan dari penelitian ini adalah; a) untuk mengetahui hubungan antara pertumbuhan biomassa dan intensitas penyinaran buatan dalam sistem plant-factory, dan b) menerapkanmodel mekanik pertumbuhan tanaman berdasarkan intersepsi radiasi dan temperatur. Enam buah kotak berisi tanaman bayam merah diletakkan pada sistem plant factory berupa dua buah rak (masing-masing rak ditempatkan 3 buah kotak). Pada masing-masing kotak diukur cahaya terintersepsi yang kemudiandikonversi menjadi nilai radiasi. Suhu udara dalam ruang plant-factory diukur selama pertumbuhan hingga panen. Pengamatan menunjukkan bahwa dalam ruang tumbuh plant-factory terdapat perbedaan intersepsi cahaya yang menyebabkan adanya variasi pada pertumbuhan biomassa tanaman. Model matematikadigunakan untuk memprediksi hubungan antara intersepsi cahaya dan pertumbuhan biomassa. Kesimpulan menunjukkan bahwa variasi cahaya yang terjadi dalam penanaman sistem plant-factory tidak dapat diabaikan, karena menyebabkan terjadinya perbedaan biomassa akhir tanaman yang cukup tajam. Permodelan dapat diterapkan untuk merancang pemberian cahaya yang optimal untuk meningkatkanbiomassa tanaman.

Kajian Kualitas Air Pasca-Pengerukan Alur Pelayaran Batu Kapur Sungai Donan Cilacap

Majalah Ilmiah Biologi BIOSFERA: A Scientific Journal Vol 31, No 1 (2014)
Publisher : Fakultas Biologi | Universitas Jenderal Soedirman

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Donan River dredging impacts on ecological regions and communities around the basin. Dredging from Buoy 27 to Buoy segment 34 as an effort to reduce silting of existing in Cilacap and Donan River shipping channel maintenance efforts limestone PT Holcim Indonesia Tbk. Cilacap Plant. The purpose of the study is to determine the condition of post-dredging water quality in terms of physical and chemical factors, to determine the condition of post-dredging water quality in terms of biological factors; and to analyze the relationship between physical, chemical, and biological factors post-dredging shipping lanes limestone around Cilacap Donan River. The research method used was purposive sampling method. The study was conducted from March-May 2013, with five replications. Samples were taken at three stations namely Station 1 (area before dredging), Station 2 (dredging area), and Station 3 (area after dredging). The results showed that water quality conditions of post-dredging chemical in terms of physical factors tend to decrease at station 2 (TSS amounted of 303.6 mgl-1, BOD5 9.806 mgl-1, COD 171.4 mgl-1), followed by station 3 (TSS 268 mgl-1, BOD5 at 18.182 mgl-1, COD is 262.8 mgl-1) and station 1 (TSS 204.4 mgl-1, BOD5 at 12.258 mgl-1, and COD of 252 , 2 mgl-1). Water quality conditions in terms of post-dredging tend to decrease at station 2 (the number of types makrobenthos by 5 species, number of individuals ind/m2 makrobenthos by 147, the number of types of plankton by 11 species and number of individuals of 1,461 ind/l) followed by station 3 (the number of species makrobenthos by 6 species, number of individuals ind/m2 makrobenthos by 180, the number of types of plankton by 12 species, and the number of individual plankton of 1,341 ind / l), and Station 1 (the number of types makrobenthos by 7 species, number of individuals makrobenthos ind/m2 by 327, the number of types of plankton by 12 species, and the number of individual plankton of 1,340 ind / l). In general, the relationship between physical factors, chemical, and biological post-dredging shipping lanes limestone around the same Cilacapmemilikikecenderungan Donan River bahwakondisi declining water quality at Station 2, followed by Station 3 and Station 1.