Nutrient distribution on soil and aboveground biomass of Macaranga gigantea five years after planting

Abstract

The aims of this study were to evaluate growth of M. gigantea and to calculate nutrient distribution in the soil and 5 - year - old M. gigantea . Soil sampling was conducted in all research plots with drill ground at a depth of 0 - 30 cm and 30 - 60 cm. The tree biomass was sampled within one stand to calculate the biomass of all the trees within a particular plot. The research findings revealed that plot 5 produces the best growth performance and the plant accumulates 2 times of N, P, K, Ca, Mg nutrients on wood, bark, branches, and leaves, compared to the plants in plots 1. The most distributed nutrients in the soil were magnesium, nitrogen, calcium, and phosphorus. Whereas the most accumulated nutrient in plant was potassium. The rel ative portion of K nutrients accumulates in the soil is quite small that is 44.18% but in stand was higher that is between 55.82%. It concluded that if th e M. gigantea harvested at 5 years, it needs to give attention to potassium nutrient for the next of p lanting cycles.