. The world's commercial products [microform] : a descriptive account of the economic plants of the world and of their commercial uses. Plant products; Produits naturels; Produits végétaux; Natural products; Botanique agricole; Botany, Economic. The World's Commercial Products The soil to wliicii tin- larmcr entrusts suwl must j)ossc'ss (-crtain (lualitics. Then the plant nuist be able to extrai ! a sufhiiint quantity of moisture from the soil, although this need not be ahunilant. Clays and heavy loams are the best soils on whieli tr) prow wheat ; but witii skilful farming and selectio
. The world's commercial products [microform] : a descriptive account of the economic plants of the world and of their commercial uses. Plant products; Produits naturels; Produits végétaux; Natural products; Botanique agricole; Botany, Economic. The World's Commercial Products The soil to wliicii tin- larmcr entrusts suwl must j)ossc'ss (-crtain (lualitics. Then the plant nuist be able to extrai ! a sufhiiint quantity of moisture from the soil, although this need not be ahunilant. Clays and heavy loams are the best soils on whieli tr) prow wheat ; but witii skilful farming and selection of tiie projier varieties, good har\ests are obtained on ligiit sandy soils. If the ground is too wet, the eorn hieks vigour, and the prodlietion of seeds is If, on tiie other , sand predominates, tile ground is too permeable and does not hold the (luantity of moisture that is absolutely necessarv for the growth of the wheat, which then thrives very badly. It will not do. says tlu> farmer, to accommodate oneself to the soil, but tiie soil must be accommodated to the plant. When necessary, its nature mav be moditied by tiie addition of different kinds of manure, that is to say, by adding the elements which it lacks. Thus, it is necessary to add lime to sandv soils, and as a rule marl that is a mi.\ture of chalk and clay âis used for the puri)ose. If one has to deal with a .soil in which clay is lacking, very claye\- marl .should be taken. The element that is added to the soil must not only modify its physical nature by giving it greater density, or, on the contrary, greater looseness, but it must also, by its chemical com- position, in(Teasp the chance of successful cultivation. Marl fulfils both these conditions. It sometimes happens that the sub-soil contains the elements which are wanted in the top soil. In that case the land must be deeply ploughed, the sub soil being brought to the surface and thoroughly- mixed with the upper layer. To put the matter
Size: 1642px × 1522px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotanyeconomic, booky
