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No Thumbnail AvailableBook (stand-alone)Manuel de contrôle des avalanches
CAHIER FAO: CONSERVATION DES SOLS 5
1978Also available in:
Pour lutter contre les avalanges, il faut avoir une connaissance aussi approfondie que possible des propriétés de la niege. On devrait être au claire sur ce sujet et en particulier savoir pourquoi les avalanches se déclenchent sur une certain pente et pas sur une autre. On devrait également savoir comment elle se déplacent, quelle vitesses peuvent être atteintes et quelles effets des forces sont prévisibles, etc. -
Book (stand-alone)Organic materials and soil productivity
FAO Soils Bulletin 35
1977Also available in:
No results found.In the temperate zones of the world a favourable balance exists between input and decomposition of organic materials in the soil. This balance is influenced by climatic conditions and the inorganic constituents of the soil, in which the amount and type of clay minerals play an important role. the plant growth caused by the use of mineral fertilizer increases not only the economically important parts of the plants, but also the growth roots and crop residues. Furthermore, in many farms animal exc reta is used to maintain the level of soil organic matter in arable land.There are some interactions between certain clay minerals and fractions of soil organic matter which act as favourable factors for soil productivity and for plant production. -
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