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"Telah dilakukan penelitian untuk mengetahui laju fiksasi nitrogen strain-strain Nostoc [Vaucher 1803] Bornet et Flahault 1886. Penelitian menggunakan 8 strain Nostoc koleksi Laboratorium Taksonomi Tumbuhan, Departemen Biologi, FMIPA UI. Penelitian menggunakan metode Acetylene Reduction Assay (ARA) dengan 2 ulangan untuk setiap strain Nostoc. Pengujian dilakukan pada strain yang telah berumur 21 hari. Biomassa berat basah strain Nostoc yang digunakan adalah 0,1 gram. Masing-masing strain diinkubasi selama 30, 60, dan 90 menit dengan menambahkan 1 ml gas asetilen.Hasil penelitian menunjukkan data yang bervariasi untuk masing-masing strain Nostoc pada masing-masing waktu inkubasi. Sebanyak 6 strain Nostoc menunjukkan nilai laju fiksasi nitrogen tertinggi pada waktu inkubasi 30 menit. Sebanyak 2 strain Nostoc menunjukkan nilai laju fiksasi nitrogen tertinggi pada waktu inkubasi 60 menit. Strain Nostoc BTM6-02 menunjukkan nilai laju fiksasi nitrogen yang paling tinggi yaitu 3892,5 μmol (dicapai pada inkubasi 60 menit). Strain Nostoc CPG24 menunjukkan nilai laju fiksasi nitrogen yang paling rendah, yaitu 292,44 μmol (dicapai pada inkubasi 90 menit).

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The research of nitrogen fixation rate of Nostoc [Vaucher 1803] Bornet et Flahault 1886 have been done. Eight strains of Nostoc from Plant Taxonomy Culture Collection, Department of Biology, Faculty of Mathematics & Natural Sciences, University of Indonesia, were used. The measurement of nitrogen fixation used Acetylene Reduction Assay (ARA) method with 2 samples for each strain. Experiments were conducted using strains at 21st day age. Wet weight of each strain was 0.1 gram. Then, each Nostoc strain was incubated with addition of 1 ml acetylene for 30, 60, and 90 minutes.

The experiment result showed a different value for each Nostoc strain in every incubation times. Six Nostoc strains showed the highest value of nitrogen fixation after incubated for 30 minutes. Two Nostoc strains showed the highest value of nitrogen fixation after incubated for 60 minutes. Nitrogen fixation rate of BTM6-02 reached the highest value of 3892.5 μmol after incubated for 60 minutes. Nitrogen fixation rate of CPG24 was the lowest ones (292.44 μmol) after incubated for 90 minutes."

"Penelitian yang telah dilakukan bertujuan untuk menganalisis pengaruh nitrat dan amonium serta pemberian strain Nostoc GIA13a terhadap pertumbuhan vegetatif tanaman kangkung Ipomoea aquatica Forsk. pada sistem hidroponik menggunakan larutan Hoagland. Penelitian menggunakan Rancangan Acak Lengkap RAL yang terdiri dari 5 perlakuan dengan 8 ulangan. Kelima perlakuan tersebut ialah Hoagland dengan nitrat ditambah Nostoc P1, Hoagland dengan nitrat tanpa Nostoc P2, Hoagland dengan nitrat dan amonium tanpa Nostoc P3, Hoagland dengan amonium tanpa Nostoc P4, dan Hoagland dengan amonium ditambah Nostoc P5. Pemberian Nostoc sebanyak 2 g ke dalam larutan hara dilakukan pada 0 hst dan 14 hst. Hasil Uji LSD.

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This research aims to analyze the effect of nitrate and ammonium as well as Nostoc sp. GIA13a on vegetative growth of water spinach plants Ipomoea aquatica Forsk. was carried out using a hydroponic system. Randomized Complete Design consisting of 5 treatments with eight replications was used in the study. The five treatments were Hoagland with nitrate plus Nostoc P1, Hoagland with nitrate minus Nostoc P2, Hoagland with nitrate and ammonium minus Nostoc P3, Hoagland with ammonium minus Nostoc P4, and Hoagland with ammonium plus Nostoc P5. Inoculation of 2 g of Nostoc sp. GIA13a in nutrient solution was performed at 0 hst and 14 hst. Furthermore, the LSD test results."