Organic Matter and Root Development of Soybean in Agroforestry Soils tropical Sub Watershed Bengawan Solo Wonogiri Indonesia

Abstract

Alfisols is a soil that lack of organic matter (OM), that's make the physical properties of the soil is easily damaged, because OM is used to be an adhesive on soil physical properties. The aim of study was to examine the physical properties of Alfisols in agroforestry based of teak and its effect on the development of soybean. This research used a Randomized Block Complete Design (RBDC) which consists of three factors (soybean varieties, teak litter dose and NPK chemical fertilizers). The results showed that Alfisols in agroforestry based on teak relative good with the stability of the aggregate value as big as 225.10 (Very Steady). Varieties and increasing teak litter doses affect soybean root development while there was no impact on NPK fertilizier. Argo Mulyo varieties have better root development than Grobogan, and litter dose of 2.5 Mg ha-1 gave the best root development in each variety.