EFFECT OF LIME, ORGANIC AND INORGANIC FERTILIZER ON NODULATION AND YIELD OF SOYBEAN (Glycine max) VARIETIES IN ULTISOL SOILS

The study was aimed to determine the effect of soil ameliorant and inorganic fertilizers on nodulation and yield of some soybean varieties. Study was conducted under greenhouse condition in acid soils. Results revealed that all the tested varieties were compatible with native rhizobium at both study areas and showing the formation of nodules. A positive correlation was reported between the number of nodules and soybean grain yield. The number of nodules and final yield production was higher in the area where soybean cultivated regularly as compare to the new area of soybean production. Inorganic fertilizers increased nodulation and grain yield but the highest yields were generally obtained in the treatment of inorganic fertilizer combined with lime or manure. Soybean variety Kaba and Sinabung showed the highest nodulation and grain yield and it was followed by Panderman and Anjasmoro Suryantini