Abstract:
The objective of the research was to determine the best N nutrient
management for isoflavone content in three soybean cultivars under dry land
conditions. Two experiments were experiment I (June to September 2012
growing season) and Experiment II (October to December 2012 growing
season). Experimental design was a randomized block design with 2 factors and
3 replications. The first factor was soybean cultivars (Anjasmoro, Wilis,
Sinabung). The second factor was N source, with Urea (50 kg/ha),
Bradyrhizobium sp., farmyard manure (10 ton/ha), a combination of
Bradyrhizobium sp. + farmyard manure (5 ton/ha) and a control with no N. A
combined analysis of variance was done to evaluate the production and the
content of isoflavone in the two different growing seasons as affected by N
source and cultivar. The parameters observed were the content of genistein,
daidzein, glycitein and total isoflavone content. Results showed that the October
to December growing season had higher genistein, daidzein, glycitein and total
of isoflavones than the June to September growing season. The treatment
cultivar Wilis plus Bradyrhizobium sp. grown at October to December growing
season increased total isoflavone content more than other treatments.
