ANALISIS KESUBURAN TANAH PADA MODEL AGROFORESTRI BERBASIS TANAMAN KAPULAGA KOPI DAN CABAI DI KHDTK PUJON HILL

This study aimed to examine the content of macronutrients and soil physical properties in agroforestry models based on cardamom, coffee, and chili at KHDTK Pujon Hill. The macronutrients analyzed included nitrogen (N), phosphate (P), potassium (K), calcium (Ca), and magnesium (Mg), while the soil physical properties observed were texture, bulk density, and porosity. The research employed a quantitative approach using a Randomized Block Design (RBD) with a two-factor factorial: plant species and land slope. ANOVA results showed that the interaction between plant type and slope had a highly significant effect on all observed soil nutrients. The highest N content was found in coffee at the lower slope (A2B3) at 0.29%, while P (1.21%), K (1.21%), Ca (17.5%), and Mg (7.57%) were highest in chili at the lower slope (A3B3). In terms of physical properties, chili at the lower slope (A3B3) also exhibited the lowest bulk density (0.75 g/cm³) and the highest porosity (96%). The productivity of the three crops varied, with chili producing around 1 ton per 0.12 ha, robusta coffee yielding only about 20 kg/year from 350 trees, and cardamom producing approximately 3.5 kg fresh weight per clump.