Integrated Nutrient Management of an Acid Paddy Soil in Karang Tanjung Village, Padang Ratu, Central Lampung

Antonius Kasno,Sri Rochayati,Irawan Irawan,Husnain Husnain

doi:10.5400/jts.2017.v22i2.97-106

Abstract

Balanced fertilization is the key factor to improve the efficiency and effectiveness of fertilization.The dosage of inorganic fertilizers applied can be determined based on the nutrient status of P, K and rice productivity. The research aims to improve balance fertilization that combines inorganic fertilizers, which is set up based on soil nutrient status, and organic fertilizers. The research was conducted in Karang Tanjung Village, Padang Ratu District, Central Lampung, in the dry season of 2009 until 2012. An experimental plot of one hectare was set up in the farmer’s paddy fields. Generally, the plot for every treatment was owned by two or more farmers. The treatments consisted of the dose of fertilizer applications for lowland rice, namely (1) dose of fertilizers based on farmer practice, (2) dose of fertilizers proposed by Petrokimia, (3) 75% of fertilizer dose that was set up based on soil analysis plus straw compost, and (4) 75% of inorganic fertilizer combined with manure and biofertilizer. At the fourth growing season, each plot was applied with 100% inorganic fertilizer (NPK fertilizer). The results showed that the limiting factor of the soil used in the current study is the content of organic-C, N, K, and CEC. The compost of rice straw used as organic matter in the current study contains higher organic-C and total-N in comparison to manure. Organic matter application in the form of straw compost or manure can reduce 25% of NPK application, while the production of rice remains high. Fertilization on paddy soils based on soil nutrient status can improve fertilization efficiency. Rice production in the treatment of 100% NPK is similar to that in the fertilization treatments based on farmer practice and Petrokima rate. Keywords: Nutrient management, acid soil, fertilization efficiency

Highlights

Soil fauna are the most important organisms which can be found both on the soil surface and in the soil and as a part of soil ecosystem
They play an important role in ecosystem functioning, especially as ecosystem engineers which contribute to soil fertility in tropical environment
The objective of this study was to determine the number and distribution of soil fauna which consisted of their population density, relative density, and frequency of occurence of soil fauna in some tailing areas of Freeport Indonesia, Timika-Papua

Summary

INTRODUCTION

Soil fauna are the most important organisms which can be found both on the soil surface and in the soil and as a part of soil ecosystem. They play an important role in ecosystem functioning, especially as ecosystem engineers which contribute to soil fertility in tropical environment These organisms interact in the soil enhancing its fertility, promoting primary production and creating acomplex food web in the soil ecosystem that serve to sustain life within the soil and on the surface (Sackett et al 2010). A tailing deposition area is one habitat that has several types of soil fauna to live and growth as well as involves in the decomposition of organic matter. Their growth and development are mainly depended on the physical and chemical properties of soil (Suin 2003).

A F Djuuna

MATERIALS AND METHODS

CONCLUSIONS