Optimasi simbiosis cendawan mikoriza arbuskula Acaulospora tuberculata dan Gigaspora margarita pada bibit

AM fungal symbiosis increase the uptake of P in oil palm seedlings. However the optimum condition of symbiosis has to be determined to get higher benefit of AM fungal symbiosis. Optimization of the symbiosis Acaulospora tuberculata and Gigaspora margarita with oil palm seedling in acid soil was determined. An experiment was conducted in polybag sized 40 x 60 cm contained sterilized Cikopomayak soil. Three factors studied were AM fungal species (A. tuberculata, G. margarita), inoculant dose (0.0; 12.5; 25.0; and 37.5% w/w), and fertilizer rate (0; 25; 50; and 100% recommended dose) and each treatment replicated three times. The result showed that optimum growth reached on the inoculant addition of 36% (w/w) in the form of infected roots, hypha, and spores and fertilizer dose of 25% for A. tuberculata, while for G. margarita was 40% (w/w) inoculant and 26% fertilizer. Efectivity of fertilizer and P uptake of oil palm seedling were significantly increased with AM fungi inoculation. P uptake of oil palm seedling inoculated with A. tuberculata increase.


Summary
AM fungal symbiosis increase the uptake of P in oil palm seedlings.However the optimum condition of symbiosis has to be determined to get higher benefit of AM fungal symbiosis.Optimization of the symbiosis Acaulospora tuberculata and Gigaspora margarita with oil palm seedling in acid soil was determined.An experiment was conducted in polybag sized 40 x 60 cm contained sterilized Cikopomayak soil.Three factors studied were AM fungal species (A. tuberculata, G. margarita), inoculant dose (0.0; 12.5; 25.0; and 37.5% w/w), and fertilizer rate (0; 25; 50; and 100% recommended dose) and each treatment replicated three times.The result showed that optimum growth reached on the inoculant addition of 36% (w/w) in the form of infected roots, hypha, and spores and fertilizer dose of 25% for A. tuberculata, while for G. margarita was 40% (w/w) inoculant and 26% fertilizer.Efectivity of fertilizer and P uptake of oil palm seedling were significantly increased with AM fungi inoculation.P uptake of oil palm seedling inoculated with A. tuberculata increase.

Figure 1 .
Figure 1.Relationship(A) and contour plot (B) between AM fungal inoculant dose, fertilizer dose, and dry weight of oil palm seedling inoculated with A. tuberculata eight months old.

Figure 2 .
Figure 2. Relationship (A) and contour plot (B) between AM fungal inoculant dose, fertilizer dose, and dry weight of oil palm seedling inoculated with G. margarita eight months old.

Table 1 .
Characteristic of soil used as growth medium in experiment.
Figure in each column1)or row 2) in each group followed by same letter is not significantly different according to Duncan Multiple Range Test, P<0.05.

Table 3 .
Effect of AM fungal dose and fertilizer on P uptake of eight months oil palm seedling.
1)or row 2) in each group followed by same letter is not significantly different according to Duncan Multiple Range Test, P<0.05.