Aquaponic is considered one of alternative culture system to improve production and quality of leafy vegetables by combining soil less culture and fish farming. Utilization of fish manure contained in waste water provides nutrient sources for growing plants. Three kinds of leafy vegetables including water spinach (Ipomoea aquatica F.), green coral lettuce (Lactuca sativa L.), and bok choi (Brassica rapa L.) were grown using both aquaponic and hydroponic system at the Green House in Serut village, Panti District, Jember Regency, from April to June 2019. Productions of each leafy vegetable were evaluated on both culture systems. Water spinach represented 29.12% higher production in aquaponic than hydroponic system, shown by significant value in plant height, number of leaves, root volume, and leaf fresh weight. Otherwise, bok choi production displayed 17.03% increased in hydroponic than aquaponic system. However, leaf production of lettuce was not significant between hydroponic and aquaponic system. Lettuce production in aquaponic only 1.90% lowest than hydroponic system indicated that lettuce was appropriate to cultivate in both farming systems.
Keywords: aquaculture, Brassica rapa L., leaf fresh weight, Ipomoea aquatica F., Lactuca sativa L., soil less culture
Penggunaan nutrisi organik untuk multiplikasi tanaman anggrek secara in vitro telah banyak digunakan untuk mendorong laju regenerasi yang tinggi pada tanaman anggrek. Setiap spesies anggrek membutuhkan penambahan sumber organik yang berbeda untuk merangsang regenerasi yang lebih baik. Pemilihan jenis sumber nutrisi organik yang sesuai pada media regenerasi anggrek sangat diperlukan untuk menghasilkan planlet anggrek yang berkualitas. Tujuan penelitian ini adalah mengevaluasi nutrisi organik yang tepat untuk regenerasi plantlet Dendrobium lasiantera x D. tiger twist, Phalaenopsis amabilis, dan Oncidium golden shower. Bahan yang digunakan antara lain air kelapa, ekstrak kentang, ekstrak tomat, dan ekstrak pisang. Penelitian dilakukan di Laboratorium Agrotechnopark Universitas Jember menggunakan Rancangan Acak Lengkap (RAL) dengan lima ulangan. Faktor perlakuan adalah kontrol (S1), ekstrak air kelapa (S2), ekstrak kentang (S3), ekstrak tomat (S4), dan ekstrak pisang (S5). Hasil penelitian menunjukkan bahwa pemberian nutrisi organik mempengaruhi ketiga genus anggrek yang digunakan. Penambahan ekstrak tomat 150 g/l menghasilkan pertumbuhan yang lebih baik untuk parameter tinggi tanaman, jumlah tunas, daun, dan akar pada angrek Dendrobium sp. Penambahan ekstrak kentang 150 g/l memberikan respon pertumbuhan tinggi planlet, jumlah tunas, dan jumlah akar yang baik pada anggrek Oncidium sp. serta jumlah daun dan jumlah akar yang baik pada anggrek P. amabilis dibandingkan sumber nutrisi organik lainnya.
Characterization of native orchid (species) in Indonesia is important for preservation of germplasm and selection process to obtain dominant character of orchids as potential parental. Morphological characterization is a method to obtain scientific information in phenotypic manner. Characterization of plants was carried out on 10 native orchids of Dendrobium genus to obtain specific character. Characterization process based on UPOV guidebook and morphological observation of pollinia was also carried out on 10 native orchids to obtain information about the structure and physiology of pollinia. The results of morphological characterization on 10 native orchid showed several qualitative characters such as flowering position, cross section of leaf, pseudobulb firmness, and leaf arrangement in D. Canaliculatum was different from 9 other native orchid. Morphological pollen of 10 native orchid shows the diversity structure of pollinia and the physiological conditions of mature pollen which are ready to pollinate are pollinia with a golden yellow colored. Knowledge and information about parental relationships is the main point for developing ornamental plant breeding programs. Selection of native orchids as potential elder is important where selected elders will be used as a source of genetic diversity. The results of this study are expected to provide scientific information and phenotypic selection for the development of hybrid orchids.
Kekeringan merupakan salah satu faktor cekaman abiotik yang dapat menghambat pertumbuhan serta menurunkan hasil tanaman padi. Penanaman varietas tahan kekeringan dengan beberapa perlakuan ketersediaan air diamati pada penelitian ini. Tujuan dari penelitian ini adalah mengkaji karakter morfologi dan fisiologi tanaman padi varietas jeliteng pada berbagai persentase ketersediaan air. Perlakuan yang digunakan dalam penelitian ini yaitu dengan pemberian air optimum padi (kontrol), 100%, 80%, 60%, dan 40% dari ketersediaan air. Hasil penelitian menunjukan bahwa pada kapasitas lapang 80% tanaman padi varietas jeliteng mengalami penurunan hasil yaitu sebesar 36,67% dibandingkan kontrol. Berdasarkan respon fisiologi, pada ketersediaan air 80% terdapat penurunan jumlah klorofil sebesar 10,54% dan peningkatkan jumlah akumulasi kandungan prolin sebesar 21,21%. Berdasarkan respon morfologi, pada 80% ketersediaan air terdapat penurunan kerapatan stomata sebesar 30,85%. Tanaman padi varietas Jeliteng merupakan varietas yang toleran terhadap cekaman kekeringan, hal ini ditunjukkan dengan tidak adanya perbedaan nilai yang signifikan pada berbagai parameter komponen hasil padi yang diamati.
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