Sains Tanah - Journal of Soil Science and Agroclimatology
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Local Air and Soil Temperature Modeling Using Himawari 8 Satellite Imagery
Full text linkHimawari 8 satellite image, which was launched in October 2014 and began the operational in July 2015, serves to identify and track the phenomenon of rapid changes in weather. The purpose of this research was to determine the model of local air and soil temperatures using Himawari 8 satellite image. Local air and soil temperatures information was collected from the Climatology Station of Semarang district, Central Java, Indonesia. Interpretation of the Himawari 8 satellite image was performed, as well as the statistical tests of correlation and regression, according to the sun's pseudo motion. Pair correlation and regression analysis on satellite image with air temperature; and air temperature with soil temperature (bare and grass). The results showed the satellite imagery of Himawari 8 could predict the air and soil temperatures, especially bare soil. In specific, the accuracies were higher on soil temperature at 0 (surface) and 5 cm depth. But each period produced vary accuracy, due to many weather elements had may affect the air and soil temperatures
Study of Soil Degradation Status at Jatipurno District, Keduang Sub-Watersheds, Wonogiri Regency, Central Java
Full text linkThis study is aimed to evaluate soil degradation based on Standard Criteria of Soil Degradation for Biomass Production under Indonesian Government Regulation No. 150 in 2000. Conducted at Jatipurno District, Keduang Sub-Watersheds, between October and December 2016, at seven selected land units, each land unit is represented by four sample points. The selection of sampling area is according to Stratified Purposive Sampling method. The evaluation of soil degradation is carried out by determining the threshold value and key factors of soil characteristics based on the Standard Criteria of Soil (matching process), which lead to degradation. The results showed that the entire soil at Jatipurno District is slightly degraded. The most extensive soil degradation 2,869.31 ha area (69.60%) is caused by a low colloid fraction, high bulk density, low total porosity and low soil permeability. The soil degradation mostly caused by low soil permeability which the number is under critical threshold < 0.7 cm hour-1 in the entire land units. Implementing providing organic matter to the soil, planting variations of cover crops, on land plots (low, medium, high cover crops), land management by crop rotation and intercropping, minimum tillage in accordance with the rules of environmental conservation, can be done to minimize the soil degradation
Soil Carbon Transitions Supporting Climate Change Mitigation
No full textMaintaining and where feasible restoring soil carbon stocks is part of all sustainable development strategies that have a chance of meeting the global commitment of the Paris Agreement to contain global warming within a 1.5oC limit. Active policies to incentivize increased soil carbon storage require understanding of the drivers of soil carbon decline, as well as the conditions under which soil management leads to an increase. Soil carbon transitions -- shifts from decline to increase of soil carbon stocks -- have been recorded as part of agricultural intensification. Organic inputs supporting soil carbon may primarily depend on roots, rather than aboveground inputs, and thus on the choice of crops, trees, and grasses that make up an agricultural land use system
The Effects of Inorganic Fertilizer and Mineral Leucite Residues on K Uptake and Maize Yields (Zea mays L.) in Oxisols
Full text linkThe purpose of this study was to determine the effect of inorganic fertilizer and leucite mineral residues on K uptake and maize yields. This research had been conducted from October 2016 to September 2017 in the experimental field of Neglasari, Dramaga, Bogor. The soil was analyzed in the Soil Chemistry and Fertility Laboratory of Sebelas Maret University, Surakarta. The study was arranged in a completely randomized block design using 11 treatments with three replications. The result showed that the NPK 150 kg ha-1 residues gave a better effect on corn yields whereas there was no significant effect of employing the standard NPK with RAE value of 123%. The study found that the residual treatment of inorganic fertilizers and leucite minerals had a significant impact on maize yields but not on K uptake
Land Suitability Evaluation for Upland Rice in Tirtomoyo District, Wonogiri Regency, Indonesia
Full text linkFood cultivation, especially upland rice is needed to fulfill the needs of dryland food. It is necessary to evaluate the suitability of the land so that it can overcome land constraints to increase the productivity of upland rice in Tirtomoyo Regency. The unit of analysis is Soil Mapping Unit based on soil type map using ArcGIS 10.1 and determination of sample point based on purposive sampling method. Data analysis was done by matching between the result of soil characteristic which has been obtained with growth requirement of the upland rice. Based on the results, District Tirtomoyo divided into 4 Soil Mapping Unit. The actual land suitability class for upland rice is moderately suitable (S2) and not suitable (N). Limiting factors include rainfall, slope, erosion hazard, basic saturation, CEC, C-organic, N-total, K2O. Improvement efforts are done by arranging cropping pattern, drainage management, a making of terracing, cover crop planting, implementing organic material, and fertilizing. The suitability class of potential land of upland rice is highly suitable (S1) and marginally suitable (S3).Barbarslot adalah permainan digital yang meniru mesin slot klasik yang biasa ditemukan di kasino. Permainan ini sangat populer karena mudah dimainkan, tidak memerlukan keahlian khusus, dan menawarkan peluang menang yang menggiurkan
Studying the Solubility, Availability, and Uptake of Silicon (Si) from Some Ore Minerals in Sandy Soil
Full text linkThe solubility and availability of Si from the feldspar, silica, and zeolite as Si-bearing minerals were studied in a sandy soil. Silicon uptake by the soybean (Glycine max L.) plant was discussed. The minerals used were applied before planting in two separate rates; rate 1 ≈ 595.2 and rate 2 ≈ 1190.5 kg ha-1 accompanied by a ≈ 4.8 kg ha-1 constant rate of the K-humate sprayed as a solution on soil after planting in a complete randomized block design. The dissolved Si from the different minerals at rate 2 followed an opposite direction to their SiO2 percentage that may be due to the structural differences: silica (1.46 mg kg-1 - SiO2 =98.4%) < zeolite (1.71 mg kg-1 - SiO2 =75.9%) < feldspar (2.09 mg kg-1 - SiO2 = 71.9%). The individual mineral treatments at rate 2 have almost decreased the available NPK estimated after soybean harvesting. The K-humate has enhanced the effect of silica at rate 2 for the available N and P. The soybean seed yield (kg ha-1) increased significantly by 117.9% for the S1 + H, 109.2% for K-humate and 57.5% for the Z2 + H. The seeds’ Si (mg kg-1) increased significantly from 3.6% to 102.9% affected by the silica treatments
