Adaptation of soybean varieties on teak shaded land in Grobogan Regency, Indonesia

One of the efforts to increase soybean production is to increase the planted area under tree stands by paying attention to shade tolerant varieties. The experiment was carried out in Grobogan, Central Java in October-December 2019. The study was done using Factorial Completely Randomized Block Design. The first factor was teak shading i.e. under teak stands aged 1-2 years, teak aged 3-4 years and teak aged ≥ 5 years and the second factor was soybean varieties i.e. Dena 1 and Anjasmoro. Data were analyzed by analysis of variance. The results of statistical analysis showed that the shade of teak trees had a significant effect on the number of productive branches at the age of 8 weeks after planting. Soybean plants under the shade of teak aged 1-2 years formed the highest root nodules and were significantly different from those planted under the shade of teak aged 3-4 years and shaded teak aged 5 years. The Anjasmoro variety planted under the shade of 1-2 years old teak produced the highest number of pods of 64 pods/plant. The lowest number of pods was indicated by the Dena 1 variety planted under teak stands aged 5 years (12 pods/plant).