Artikel (421)
Analternative to replacing the expensive potassium (K) fertilizers, such as KCl, should be investigated by Indonesia as the third largest cocoa (Theobroma cacao L.) producing country. The objective of this study is to investigate the effect of plant derived ash (PDAsh) application on soil nutrient s...
JOURNAL OF TROPICAL SOILS; Vol. 14 No. 3: September 2009; 185-193 | 2009
Laboratory experiment aimed to study effect of oxalic acid, Na+, NH4+, and Fe3+ on the release of fixed potassium and basal distance of smectite in smectitic soils was conducted in Laboratory of Soil Sciences, Graduate School of Agriculture, Kyoto University, Japan. The experiment used four of topso...
JOURNAL OF TROPICAL SOILS; Vol. 14 No. 3: September 2009; 177-184 | 2009
Effectivity of the Earthworms Pheretima hupiensis, Eudrellus sp. and Lumbricus sp. on the Organic Matter Decomposition Process (E.K. Anwar): The earthworms are the one of soil fauna component in soil ecosystem have an important role in organic matter decomposition procces. The ea...
JOURNAL OF TROPICAL SOILS; Vol. 14 No. 2: May 2009; 149-158 | 2009
The study was conducted in Keputran village, Tanggamus District, Lampung Province. The aim of this study to find out a proper combination of NPK fertilizer and chicken manure for the vegetable crops, especially chinese mustard (Brassica campetris Var. Chinensis L.) in order to increase the produ...
JOURNAL OF TROPICAL SOILS; Vol. 14 No. 3: September 2009; 211-219 | 2009
The objectives were to identify land characteristics of agroforestry system that influencing its benefit value, and to compile criteria of site specific. Location were identified by the Landsat 7 ETM+ that designed in the landuse utilization type: rubber agroforestry is identified by cyan old (RGB p...
JOURNAL OF TROPICAL SOILS; Vol. 14 No. 1: January 2009; 81-87 | 2009
There were 3 prospective isolates of cellulolytic bacteria resulted from the total of 31 isolates we found, i.e. C4-4, C5-1, and C11-1. Four combinations of bacteria including C4-4 + Xilanolytic (A), C5-1 + Xilanolytic (B), C11-1 + Xilanolytic (C), 45I-3 + 234P-16 (D), and control (E, without ba...
JOURNAL OF TROPICAL SOILS; Vol. 14 No. 1: January 2009; 71-80 | 2009
The research was conducted in order to know population of Rhizobium bacteria in the soil at several plant from Buton island, Muna regency, Southeast Sulawesi. The purpose of the study was to get the population data and pure cultures of Rhizobium bacteria.Rhizobium bacteria were isolated from 13 samp...
JOURNAL OF TROPICAL SOILS; Vol. 14 No. 1: January 2009; 65-70 | 2009
A soil water retention curve determination method is developed based on the use of gipsblock and capacitance sensors. The objective of the research was to provide a simple and quick method in characterization of soil water retention in the laboratory based on resistance and capacitance sensors. Undi...
JOURNAL OF TROPICAL SOILS; Vol. 14 No. 1: January 2009; 57-64 | 2009
The fertilizer availability as source of N, P, and K nutrient where plant responsif was difficult found by farmer. Thefore, It was needed information about nutrient availability in soil properties to know nutrient deficiency of its by maize as plant indicator. The objective of this research ...
JOURNAL OF TROPICAL SOILS; Vol. 14 No. 1: January 2009; 49-56 | 2009
Banjarese farmers in South Kalimantan apply a very minimum nitrogen (N) fertilizer in growing local rice. This practice has been adopted for many years. Yet, the grain yield level at farmers’ field is not necessary low. We are questioning about N sources for the crop. This study only focuses ...
JOURNAL OF TROPICAL SOILS; Vol. 14 No. 1: January 2009; 41-47 | 2009