NITROGEN AND P UPTAKE IMPROVEMENT OF FORAGE LEGUMES BY ROCK PHOSPHATE FERTILIZATION AND VAM INOCULATION



D. R. Lukiwati(1*), S. Hardjosoewignjo(2)

(1) Animal Science Faculty of UNDIP, II. Kagok II/5 Semarang, Indonesia
(2) Animal Science Faculty of IPB, Kampus Darmaga, Bogor, Indonesia
(*) Corresponding Author

Abstract


This experiment was conducted to detennine the effect of rock phosphate fertilization and vesicular-arbuscular mycorrhim (VAM) inoculation of Glomus sp on nitrogen (N) and phosphors (P) uptake of Flemingia congesta (flemingia), Pueraria phaxeoloides (puero), and Stylosanthes guianenxis (stylo) on the Latosolic soil sterilized by gamma irradiation. Flemingia, puero, and stylo were fertilized by rock phosphate (0, 100, 200, and 300 kg P105/ha or 0, 0.8, 1.6, and 2.4 g rock phosphate/pot) and were inoculated by Glomus sp. (control, 50 spores/pot).
Legumes were cut twice at 3 month and 2 month, respectively. N and P uptake of flemingia and puero were increased (P<.05) by VAM inoculation. N and P uptake of puero were higher (P<.05) than flemingia and stylo with VAM inoculation for both the first and second cutting. However, N and P uptake of mycorrhizal puero were decreased (P<.05) on the second cutting. N and P uptake of stylo with and without VAM inoculation were not significantly different (P>.05) on the first and second cutting. P uptake of legumes was increased (P<.05) by rock phosphate 300 kg
P105/ha.


Keywords


Mycorrhiza, Rock phosphate, Flemingfa cangesta, Puemria phaseoloidex, Stylosanlhes guianensix

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