Penggunaan Azospirillum pada Tanah Masam dengan Aluminium Tinggi Terhadap Produksi dan Serapan Nitrogen Rumput Setaria splendida dan Chloris gayana
Abstract: High content of Al
on the soil maybe harmful (toxic for plant). Red and yellow podzolic soil was
marginal land that characterized by high Al content. Azospirillum is free
living N fixing bacteria that can be associated with grass. This research was
conducted to find the best yield of grass planted on the soil inoculated with
Azospirillum. The research consisted of some steps; 1) soil sampling 2)
laboratory research: bacterial isolation, isolate selection, standardized of
population, content of IAA 3) pod experiment. Pod experiment in the glass house
was designed in completely randomized design, that consisted of six treatments.
The variables observed were dry mass production of shoot and root, nitrogen
content of shoot and root, and nitrogen absorption. Four best isolates chosen
were; SM Setaria, OBIS/BD, PO2 and PM2. Azospirillum isolates enhanced shoot
and root production, nitrogen content and N total absorption of tolerance one
(S. splendida). The susceptible (C. gayana), Azospirillum significantly
enhanced shoot and root nitrogen content, but did not affect the growth,
production and N total absorption. Root growth that was inhibited by Al
toxicity, decreased the symbiotic capability of nitrogen fixing bacteria. PM2
isolate showed the best effect on production and quality of S. splendida as
well as on C. gayana. This isolate will be used for future research. PM2
produces 6.4 ppm Indole Acetic Acid that promoted root growth.
Penulis: P.D M.H Karti
Kode Jurnal: jppeternakandd050032
