Artikel (421)
Rekomendasi Pemupukan P Untuk Tanaman Jagung Pada Tanah Inceptisols Menggunakan Pendekatan Uji Tanah
Productivity of maize in Central Sulawesi has been significantly low. The evidence has been a challenge on maize development in this area. Rational fertilization based on soil conditions and nutrient requirement of plants croped, has saved use of fertilizer, increased efficiency of the farm and also...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 2: May 2008; 95-102 | 2008
The releasing pattern of applied P in the acid upland soils and the soil properties influencing the pattern were studied. Surface horizons of six acid upland soils from Sumatra, Java and Kalimantan were used in this study. The releasing pattern of applied P (300 mg P kg-1) of these soils...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 2: May 2008; 87-94 | 2008
Three pedons of Andisol (TN-1, TN-2 and TN-3) developed from young volcanic materials of the Lokon, Soputan, and Lengkoan volcanoes respectively in the Tondano area, North Sulawesi, were studied in the field, and 18 soil samples were analysed in the laboratory for physical, chemical, and mineralogic...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 1: January 2008; 77-85 | 2008
The study aimed at building model of dry land management. Dynamic System Analysis was used to build model and Powersim 2.51 version for simulating. The parameter used in model were fertilizer (urea, SP-36, ACL), productivity (corn, cassava, mungbean), soil nutrient (N, P, K), crop nutrient r...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 1: January 2008; 67-76 | 2008
Rainforest conversion into agricultural lands in Nopu Upper Catchment such as cocoa plantations, maizes, cassava, peanuts, and scrub and bush were significantly increase soil erosions and surface runoffs, which in turn will decrease crops productivity and hydrologic functions of watershed. Soil ...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 1: January 2008; 59-65 | 2008
The experiment aims to know the role of rock phosphate, phosphate-solubilizing bacteria and farm yard manure application in improve quality of acid upland and its influence to soybean yield. Experiment was conducted in the greenhouse using Ultisols from Kentrong at 2001 year....
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 1: January 2008; 49-58 | 2008
The research was conducted in Tamanbogo Station Research in the 2007 Rainy Season in upland rice-corn intercropping farming. The research design used Randomized Complete Block Design with 3 replications. The treatments were 1). 15 t ha-1 manures + Residues of rock phosphate (RRP), 2). Without ma...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 1: January 2008; 41-47 | 2008
An experiment was aimed to study effect of waste water of crude palm oil (CPO) factory on some nutrient available in soil and nutrient content in palm oil.  The experiment was conducted using a completely randomized block design with six levels of waste water treatments (0, 250, 500, 750, 1.0...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 1: January 2008; 35-40 | 2008
Lateritic soils (Ultisols and Oxisols) are commonly characterised by high phosphate sorbing capacity due to the type of clay and present high content of aluminium (Al) and iron (Fe) oxides. Addition of fresh organic matter (OM) may contribute to management of these soils by releasing more bicarb...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 1: January 2008; 23-34 | 2008
Phosphor is a macro nutrients and it becomes the main limiting factor for maize growth on Ultisols. Rock phosphate is one of P fertilizer sources contains high P and Ca content, slow release and soluble under acid condition, suitable for acid soil. The objective of this research is to study the solu...
JOURNAL OF TROPICAL SOILS; Vol. 13 No. 1: January 2008; 11-22 | 2008