EFFECT OF FALLOW LAND, CULTIVATED PASTURE AND ABANDONED PASTURE ON SOIL FERTILITY IN TWO DEFORESTED AMAZONIAN REGIONS
نویسندگان
چکیده
منابع مشابه
Effect of lupins and pasture on soil acidification and fertility in Western Australia
An 'across the fence' comparison of farmer paddocks with nearby virgin bush sites was made at 3 locations, to measure the effects of lupins and subterranean clover based pastures on the chemical properties of the soil. Estimated rates of acidification in the 0--60 cm depth were 0.29-0.55 kmol H+/ha.year for wheat-lupin paddocks and 0.16-0.21 kmol H+/ha.year for pasture paddocks. A significant p...
متن کاملInfluence of Pasture and Rainfed Agriculture Land Uses on Soil Loss in Dojag-Chay Subwatershed (Ardabil Province- NW Iran)
One of the main resonator factors in watershed soil erosion is inappropriateland management including conversion of pasture land to dry-land farming.Unfortunately, the changes of Gara Su watershed usages have been very common.Thus, in order to understand the influence of land use on runoff rate and soil loss, soillosses were investigated and determined under both pasture and dry-land agricultur...
متن کاملPasture damage by an Amazonian earthworm
where xi41 if the ith step is r , 11 if the ith step is l ^ and 0 otherwise. Because asymmetric knots disrupt human bilateral symmetry, we consider the most symmetric knots from each class, that is, the ones that minimize s. Whereas the centre number g and the symmetry s specify the move composition of a knot, balance relates to the distribution of these moves; it corresponds to the extent to w...
متن کاملSoil Nitrocxn and Pasture Management
The. seasonal pattern of nitrogen mineralization is described and compared with the potential demand for nitrogen by grasses. Peak mineralization rates occur in spring but are quite inadequate for expression of potential grass growth. Nitrogen fixation by clovers provides a significant input into the system over a short period. Consideration of the fate of fixed nitrogen shows that losses large...
متن کاملFactors Limiting Tropical Rain Forest Regeneration in Abandoned Pasture: Seed Rain, Seed Germination, Microclimate, and Soil
Vegetation, seed rain, seed germination, microclimate, and soil physical and chemical parameters were measured in a recently abandoned pasture and adjacent primary rain forest in southern Costa Rica. The goal of this study was to assess the importance of these factors in limiting forest regeneration in abandoned pastures. Seed rain of animal dispersed species decreased dramatically in the pastu...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Scientia Agricola
سال: 1997
ISSN: 0103-9016
DOI: 10.1590/s0103-90161997000100007