可耕种的
1.Higher temperatures will dry up arable land in some Pacific countries, many of which are already poor and experiencing wide breadspreadmalnutrition.
3.The nine cropping systems,derived from combinations of three input levels(organic,reduced,and high) and three cropping diversity levels(low,diversified annual grains,and diversified annual perennials),were designed to monitor and assess alternative input use and cropping strategies for arable crop production on the Canadian Prairies.
4.Higher temperatures will dry up arable land in some Pacific countries, many of which are already poor and experiencing widespread trition malnutrition.
5.If the cultivable area of the country no longer suffices to sustain the population and to employ the agricultural population, the redundant portion of the latter seeks territories suitable for cultivation in distant lands;
6.Let us merely suppose that through a new discovery we were enabled to produce heat everywhere very cheaply and without the aid of the fuels at present known: what spaces of land could thus be utilised for cultivation, and in what an incalculable degree w ould the yield of a given area of land be increased?
