Written in English
Thesis (Ph.D.) - Loughborough University, 1998.
|Statement||by Ignacio Arévalo-Méndez.|
Impact of Soil Conservation on Crop Production in the Northern Ethiopian Highlands. Discussion Paper Deforestation and soil erosion. No-till farming after various grasses and leguminous cover crops in tropical Alfisol: : Pedro A. Sanchez. Quantiﬁcation of soil quality changes following deforestation by measurable soil attributes is important to sus-tainable management of soil and water conservation. A study was initiated in to evaluate the effects of deforestation on physical and chemical properties of soils under oak (Quercus brontii) forests in Lordegan region. However, the increasing human population and expansion of agricultural land have led to deforestation. We determine the effect of deforestation on soil fertility, soil carbon and nitrogen stocks and hypothesize that tropical forests and agroforestry have similar characteristics, in contrast to the deforested areas used as by: Soil conservation at work: Guatamala’s small fanner project. and B.N. Okigbo. No-tillage farming after various grasses and leguminous cover crops in tropical Alfisols I. Crop performance. Field Crops Res. 1 Wilson, G.F., R. Lal, and B.N. Okigbo. Effects of cover crops on soil structure and on yield of subsequent arable.
Plane view of deforestation-induced erosion in Madagascar. Click image for more information. (Photo by R. Butler) After heavy tropical rains fall on cleared forest lands, the run-off carries soil into local creeks and rivers. The rivers carry the eroded . Deforestation causes soil erosion. Because the roots of trees hold soil tightly and prevent the soil from erosion. If we cut trees the roots leave the soil and so that the soil will erode. When forest is cut down, nothing is there to protect the s. Which of the following human activities would be most beneficial to soil conservation? Grow cover crops. The planting of trees is detrimental to soil because it drains the soil of nutrients. False. such as Siberian vs. Tropical Rain Forest? age of trees. Which of the following best explains why soil conservation is important to human agriculture? a. Erosion prevention prevents millions of dollars in damage from mudslides. b. It is easier to prevent the degradation of old soil than it is to generate new soil. c. If the soil salinity gets too high crops will not be able to grow in it. d.
The paper reviews the available information on soil degradation which is a major agricultural and environmental problem in the Philippines. Soil erosion appears to be the most widespread process. After this slash-and-burn deforestation, the nutrient reservoir is lost, flooding and erosion rates are high, and soils often become unable to support crops in just a few years. If the area is then turned into cattle pasture, the ground may become compacted . Soil loss was minimum for tree crops with contact cover (e.g. grass or cover crop) and maximum on tilled bare soils, with a ratio of , between the two values. Among bare soils, soil loss was 40% higher with tillage than without (the latter still had a high absolute value of soil loss). Soil is the earth’s fragile skin that anchors all life on Earth. It is comprised of countless species that create a dynamic and complex ecosystem and is among the most precious resources to humans. Increased demand for agriculture commodities generates incentives to convert forests and grasslands to farm fields and pastures. The transition to agriculture from natural vegetation often cannot.