. Java, Sumatra and the other islands of the Dutch East Indies . 4^11^^. NATIVE IRRIGATION WHEELS.(Rattan wheels, wattle paddles, bamboo buckets, wooden pipes.]. NATIVE ENGINEERING : A BAMBOO CANTILEVER BRIDGE. AGRICULTURE: VARIOUS CROPS 221 Liberia coffee is grown more especially on the plains ;all varieties grow best on soils which contain an excessneither of clay nor of sand, are not too heavy, and arewell mixed with humus. Land for a new plantation is broken up at thebeginning of the dry season. The trees—if it be forestland—may be felled or burned ; in the latter case theheat of their bur
. Java, Sumatra and the other islands of the Dutch East Indies . 4^11^^. NATIVE IRRIGATION WHEELS.(Rattan wheels, wattle paddles, bamboo buckets, wooden pipes.]. NATIVE ENGINEERING : A BAMBOO CANTILEVER BRIDGE. AGRICULTURE: VARIOUS CROPS 221 Liberia coffee is grown more especially on the plains ;all varieties grow best on soils which contain an excessneither of clay nor of sand, are not too heavy, and arewell mixed with humus. Land for a new plantation is broken up at thebeginning of the dry season. The trees—if it be forestland—may be felled or burned ; in the latter case theheat of their burning increases the fertility of the when a whole forest is cut down, care is taken toleave rows of trees as windbreaks, which protect theyoung shrubs from the prevailing winds.^ The land must then be thoroughly freed from harmfulweeds, sometimes by ploughing, more often by thepatjoly and sometimes by hand or with a curved knife{arit) ; when the land is sloping the trees are planted interraces. It is especially necessary to eradicate the alang-alang (Imperata arundinacea Cyr.), and to burn it, rootsand all. Otherwise, even if buried m heaps a
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