Effect of nanoparticle of volcanic ash and rock phosphate on some soil chemical properties of variable charge Andisols, Indonesia

Abstract

Andisols is a variable charge soil where fertilizations to the soil do not give the same result as that to the soils with permanent charges. Therefore, amelioration is needed to improve the soil chemical properties. The purpose of this research was to find out the influence of nanoparticles of volcanic ash and rock phosphate as ameliorants on pHw, pH0, P-retention and available P on variable charge Andisols, Indonesia. This research used a complete randomized experimental design on factorial pattern with two factors. The first factor was nanoparticle of volcanic ash consisting of four levels i.e. 0, 2.5, 5.0 and 7.5% of soil weight (w/w). The second factor was nanoparticle rock phosphate, also consisting of 4 levels like nanoparticle of volcanic ash. The treatments were repeated 3 times. The results showed that there was an interaction between nanoparticle of volcanic ash and rock phosphate in increasing pHw to 5.37 and increasing availbale P to 330 mg kg-1. However, there was no interaction in pH0 and P-retention. Nanoparticle of volcanic ash and rock phosphate was found effective to improve some soil chemical properties after one month of incubation.

Keywords

• Nanoparticle
• pHw
• pH0
• P-retention
• available P