Sources of CO2 from the soil include root respiration, decomposition of newly fallen aboveground litter and decomposition of old soil organic matter. Rhizosphere processes play a key role in soil respiration which is the main carbon efflux from peatland ecosystem to atmosphere. Plant rhizodeposits supply low-molecular weight carbon substrates to the soil microbial community, resulting in elevated levels of activity surrounding the root. We studied the effects of rhizosphere in oil palm plantation on the fluxes of CO2. Carbon dioxide emission flux of peatland was collected in Meulaboh, West Aceh using cylindrical chambers and analysis air samples of chamber by gas chromatograph. Five-point transects perpendicular to drainage canal provided variation in depth of water table for the samples. The data confirmed that The CO2 flux from rhizosphere chamber with additional roots was one to four times higher than from bulk soil chamber.
The practices of tin mining which removing all layers of soil on deposits of minerals caused the seriously environmental problems, i.e degradation of physical and chemical soil, disappearance of vegetation, flora and fauna in ecosystems that changed the microclimate. In the tailings area of tin mining have unstable structure, the content of organic matter is very low, so it is vulnerable to land slides and erosion. The characteristic of tailing area that very acid, low nutrient availability, low water storage and high soil temperature are constraints in the conservation and improvement this area. The aim of this research was found conservation technology to improve the properties of soil on Tin mining land due to human activities that cause environmental damage both micro and macro so determination of plant species and specific location technology can be done based on characterization and potential evaluation soil resources. Annual crop cultivation and cultivation of legume cover crop (Mucuna sp., Long-lived, Calopogonium sp., Peuraria javanica) and management of top soil and organic matter are a must, in addition to improve soil structure, maintaining soil moisture, as well as to reduce the loss nutrients, as in textured rough soil (sandy) nutrients in soil are easily washed.Keywords: Characteristic soil, improvement, tailing area, tin mining
The poultry manure and vertisols matter have potency for reclaiming a soil. The research objectives was to study the effect of poultry manure (PM) and vertisols matter (VM) on availability and leaching of macro nutrient in coastal sandy soil treated by rainfall simulation. A laboratory experiment was conducted with lesymeters to measure nutrient leaching. The factorial 4 × 4 treatment applied was arranged by randomized completely block design with three replications. The first factor was level of PM consisted of 0, 20, 40, and 60 Mg ha -1 . The second one was the level of VM consisted of 0, 5, 10, and 15%. Variables observed were soil physical and chemical properties such as bulk density (BD), particle density (PD), porosity, pF 2.54, pF 4.2, available water capacity (AWC), permeability, cation exchange capacity (CEC), available macro nutrients (N, P, K, Ca, Mg, and S) by Morgan Wolf extraction, and the rate of macro nutrient leaching measuared by Spectrophotometry and Atomic Absorption Spectrophotometry. Result of the research showed that application of PM and VM in the sandy soil decreased soil PD and BD, increased soil porosity and AWC, decreased soil permeability, and slightly increased soil CEC. Application of PM and VM increased soil available nutrient in the sandy soil. Up to 60 Mg ha -1 dose PM increased soil available nutrient, while 10 to 15% dose, VM did not increased it. The rank of nutrient leaching from high to low by rain simulation was N-NO 3 -> SO 4 = > K + > Ca 2+ . Leaching of K and N-NH4 + could be reduced by soil amendment. Combination of PM 60 Mg ha -1 and VM 10% was the best soil amendment for increasing nutrient availability and decreasing nutrient leaching in the sandy soil.
Tujuan penelitian adalah menganalisis bsarnya biaya transaksi pada sistem agribisnis ubi kayu dan menganalisis pengaruh biaya transaksi terhadap pendapatan ubi kayu di Kabupaten Lampung Tengah. Tempat penelitian di Kecamatan Rumbia Kabupaten Lampung Tengah. Penelitian menggunakan metode survei kepada 141 petani ubi kayu di Kecamatan Rumbia Kabupaten Lampung Tengah yang diambil secara purposive. Analisis menggunakan metode analisis kuantitatif pada Transaction Cost (TrC); Analisis pendapatan; dan Analisis regresi linear berganda. Hasil penelitian (1) biaya transaksi pada sistem agribisnis ubi kayu Rp. 732.725,17/ha/petani/musim (2) pendapatan usahatani ubi kayu sebesar Rp. 10.666.036,03/ha yang artinya usahatani ubi kayu layak untuk terus dikembangkan di Kabupaten Lampung Tengah dan biaya transaksi berpengaruh nyata terhadap pendapatan usahatani ubi kayu
Currently, Indonesia has 1.7 million hectares of oil palm plantations on peatland (12% of the total area of 13.5 million ha Indonesia’s peatland). As a consequence, fires on peatland become trending topics. Field observation research that aims to determine the physical and chemical characteristics of peat in oil palm plantations has been carried out on several peat locations in West Aceh District: Suakraya village, Johan Pahlawan district (15 years old), Cot Gajah Mati Village, Arongan Lambalek district (1 year old), and Suakpuntong village, Nagan Raya district (10 years old). Substantial changes in the physicochemical properties of soils from oil palm plantations were observed, then evaluated the impact these characteristics to fires on peatland. The analysis soil showed that peatlands around in West Aceh District have physical characteristic: bulk density (BD) from 0, 12 - 0.16 g cm-3; groundwater level of 6 cm (rainy seasons) and 86 cm (dry seasons); moisture or water content in the surface layer (0-20 cm) during the dry season was 505 - 985% The thickness of peat was 457 cm on deep peat in Suakraya, 157 cm on shallow peat in Suakraya, 243 cm in Cot Gajah Mati, 136 cm in Suakpuntong. The chemical characteristic of peat soil has pH H2O 2.9 – 3.9, pH KCl 2.23 - 3.07. The level of maturity of peat in the surface layer in all observation locations is the same, namely hemic. Water content per unit dry weight depends on peatland maturity level (fibric: 540 - 1187%, hemic: 268 - 480% and sapric: 106 - 242%). Ash content per unit dry weight varied from 1.8 – 5.9%, and C-organic content 53.4 – 57.6%. Peat total acidity is 4.2 – 6.4 me g-1, COOH content 0.02 - 0.16 me g-1 and phenolic-OH content 4.2 – 6.2 me g-1. The important result of this study showed that the causes of peatland fires are not caused by the characteristics of peat (occur naturally), but there are triggers of human activities.
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