Artikel (26)
Forest conversion to some land use happened in all watershed, includes Batang Pelepat watershed. The objectives of this research are to know effect of forest conversion to land of rubber (Hevea brasiliensis) and palm oil (Elaeis guinensis Jack) farming on run off and soil erosion and different of er...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 3: September 2008; 253-260 | 2008
The study of the external hyphae of AMF was conducted for getting data of the soil hyphae distribution from the observation using thin section preparation. The experiment was arranged in factorial fully randomized design. The 1st factors are dosages of P application: 0; 45; 90; 135; and 180 kg ha-1....
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 3: September 2008; 241-252 | 2008
Protozoa and alga play important roles in biogeochemical nutrient cycles in freshwater environment, especially in the paddy fields. The changes from the conventional technologies to organic technologies will change the communities structures of organisms lived in the paddy fields environment.�...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 3: September 2008; 225-231 | 2008
A research was conducted to study response of potato (Solanum tuberosum L.) plant to the application of fermented organic matter (‘porasi’) (0, 7.5, 15.0, and 22.5 t ha-1), without or with inoculation of Azospirillum sp., and N fertilizer (0, 86, 172, and 258 kg ha-1 N) and also to ...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 3: September 2008; 217-224 | 2008
The research of Tithonia diversifolia utilization in the paddy soil that was fertilized P-starter on yield and N, P, K uptake on rice crop, has been conducted from August to December 2005. The objective of this research was to determine interaction between P-starter levels, and tithonia levels o...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 3: September 2008; 209-216 | 2008
A simple and cheap method to detect herbicide residue in soil and water is urgently needed as the quantity and frequency of herbicide usage is steadily increasing in Indonesia which raises concern about the effects of herbicide residue in soil and water. This study is the third step from a serie...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 3: September 2008; 199-208 | 2008
The use of organic materials aimed at reducing the dependence on inputs such as chemical fertilizers can contribute to sustainability and improving the low N fertilizer efficiency of rice plants in paddy soils. Therefore, better understanding of N transformation in flooded soils, particularly th...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 3: September 2008; 189-197 | 2008
Landform of Gunungsewu karst topography dominated by positive forms consists of hills and negative forms of dolines. On the micro toposequen of karst,  most of dolines dominated by red soils which hue 2.5 YR – 5 YR, whereas on hills by soils which hue 5 YR – 7.5 YR. The aim of r...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 2: May 2008; 161-170 | 2008
Crop and management factor value is significantly corelated with outputs of ANSWERS model especially on soil erosion.  Using daily crop and management factors (daily C factors), the ANSWERS model performs well in predicting soil erosion which is showed by determination coeffient (R2 = 0.89), ...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 2: May 2008; 155-160 | 2008
Land degradation is a serious problem in the Upper Sekampung Watersheds. This is because the farmers cultivated in steep land to coffee crops without  in adequate soil and water conservation practices.  The land degradation is mostly caused by erosion. The erosion problem not only ...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 2: May 2008; 145-153 | 2008