The purpose of the paper is to investigate the soil organic matter and related properties of Terra Preta soils and to then relate them to modern sustainable agriculture. This paper is intended for scientists and students interested in the soil fertility of Oxisols. Abstract Most soils found in the Amazon region are characterized by highly weathered profiles that are incapable of long-term agric...

The transformation of inorganic iodine (I(-) and IO(3)(-)) incubated in soils with varying amounts of organic matter (Andosols from the surface layer of an upland field and forest, as well as Acrisols from surface and subsurface layers of an upland field) was investigated by using the iodine K-edge X-ray absorption near-edge structure (XANES). After 60d of reaction, both I(-) and IO(3)(-) were ...

Changes in surface charge of soil particles that accompany mineral transformations during soil formation were measured for a humid tropical chronosequence in Hawaiian basalt ranging in lava flow age from 0.3 to 4100 kiloyears (ky). Parent mineralogy is dominated by glass, olivine, pyroxene, and feldspar, whereas poorly crystalline (PC) weathering products (allophane, microcrystalline gibbsite, ...

The mechanisms underlying the retention of inorganic N in acidic forest soils in southern China are not well understood. Here, we simultaneously quantified the gross N transformation rates of various subtropical acidic forest soils located in southern China (southern soil) and those of temperate forest soils located in northern China (northern soil). We found that acidic southern soils had sign...

The loss of organic matter from soil is mainly the result of the clearing of forests for grassland or cropland. On the basis of the assumptions outlined here, the annual loss of organic carbon from the world's soils is between 2.5 x 1015g and 7.4 x 1015g, with 4.6 x 1015g being considered a realistic estimate. These amounts are 0.2, 0.5 and 0.3 per cent of the toial organic carbon (1477x 1015g)...

Phosphorus (P) is an important macronutrient in arctic and subarctic tundra and its bioavailability is regulated by the mineralization of organic P. Temperature is likely to be an important control on P bioavailability, although effects may differ across contrasting plant communities with different soil properties. We used an elevational gradient in northern Sweden that included both heath and ...

lor, 1989; Wada, 1989). However, little is known about the adsorption characteristics of DOP. Only one study Leaching of dissolved organic matter (DOM) and associated nutrihas examined adsorption isotherms of DOP in natural ents can be a significant loss from developing ecosystems. We studied DOM for soils. Kaiser (2001) compared the adsorption how the adsorption of dissolved organic P (DOP) an...

In the present investigation, physicochemical properties, lime requirement, fertility status and DTPA extractable Zn of soils of Dimapur district of Nagaland were studied. The soils of study area were strong to moderate acidic in reaction with pH ranged from 4.12 to 5.30 and were normal in total soluble salts. The CEC of the soils was quite low, varied from 10.4 to 14.0 cmol (P) kg . The averag...

The need for accurate information on the organic matter (OM) content in soils at European, National or Regional level has been increasing steadily over the past few years. This is a result of increasing concern about environmental problems such as soil degradation, desertification (CEC, 1992; UNEP, 1991), erosion and, at the worldwide level, the impact of climate change. There is some evidence ...

introduction: intensified agriculture over a long-term is an important factor in soil change phenomena that can cause some unwanted effects on soil properties. to examine this hypothesis, chemical properties of the soils under sunflower cultivation over five decades and adjoining virgin lands were investigated in order to monitor changes caused by long-term cropping. the studied soils are influ...