Erosion control in the tropics - Part 2 docx

... clear that when observing the erosion phenom- ena, the important thing is always to trace the causes of it. In the fol- lowing chapters we will go more deeply into the erosion process, which ... characteristics of erosion in the daily work. For this, it is important to know how to recognize erosion in the field. Always keep the course of the erosion proce...

Ngày tải lên: 02/07/2014, 05:20

... Erosion control in the tropics 28 Removing this soil from the drainage system or the paths adds to the workload of the farmer. ? The reverse applies of course to the field where the soil ... labour and the farmer is obliged to sow up a smaller area for in- stance. ? When thin layers of soil are continually washed away from the field by erosion, the big...

Ngày tải lên: 02/07/2014, 05:20

... an insight into the causes and the course of the erosion process, by stating the factors which influence the mechanism of erosion and how these factors are linked up. Introduction 9 If the ... soil erosion 7 1.3 The seriousness of the erosion problem 8 2 How to recognize erosion 10 2. 1 Symptoms of erosion 10 2. 2 Other ways to discover erosion 14 2. 3...

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... Erosion control in the tropics 20 Organic matter content of the soil Organic matter probably is the most important factor in binding the soil particles. The better the soil particles ... resist this force, is handled in Paragraph 3 .2. Erosion control in the tropics 22 In practice this can result in the field becoming more stony because the...

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... and at retaining the rain water. ? Minimum tillage, mulching and the use of a cover crops serve to protect the soil against the force of the rainfall, at the same time maintaining the soil fertility ... grassland influence arable farm- ing. Think of the cattle pastures where manure will again benefit the soil. The felling of trees and the planting of trees also stron...

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... again. Burning is an integral part of cattle farming in the tropics and improvements in the technique must be found. The timing and the method of burning seem to determine whether it is damaging ... drinking places and in doing so they trample down the soil. During rain showers water collects in the trampled tracks (the rain does not necessarily affect the str...

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... drain The main drainage serves as the main channel where all the water is collected. ? One main drain at the bottom of the catchment area: all the col- lected water ends up in the main drain ... here. Erosion control in the tropics 62 the terrace drain is often laid out down-slope (as in figure 25 ) because there is not such a danger of silting up here a...

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... yourself why erosion occurs in a certain area. Not only will the deeper causes of erosion be found in the socio-economic backgrounds, but the incentive will be found which motivates the farmer ... Underlying causes of erosion 73 8 Underlying causes of erosion In the previous chapters we have seen how the chance of erosion can be lessened by taking certain prec...

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... underestimated. Erosion control in the tropics 76 9 .2 Awareness Only if people appreciate the usefulness of the operations to be carried out, will they be inclined to take them up themselves. They should ... concerned or the well-intentioned development worker ei- ther. Sometimes the causes can only be tackled by political influence among the people themselves, a...

Ngày tải lên: 02/07/2014, 05:20

... 28 0 pp., IT Publications, London, United Kingdom. ISBN: 1- 8533 9-1 2 2- 0 . Available from CTA, 20 credit points. Reij, C., et al. Sustaining the soil: Indigenous soil and water con- servation in ... criticisms. Erosion control in the tropics 84 The ends of the hose are fixed firmly to the lath. This can be done us- ing part of an inner tube that is th...

Ngày tải lên: 02/07/2014, 05:20