ตัวอย่าง tropic

• In some highly fragile environments, found most often in the tropics, soils may be highly vulnerable to rapid and irreversible degradation with inappropriate agricultural practices.

• Although the focus of this proposition is the developing world tropics, problems with agricultural development in semi-arid regions are not confined to the developing world.

• Elsewhere, and especially in the semi-arid tropics where climate is much harsher, more ®ckle and more extreme, life has always been far tougher.

• Genetic improvement of selected vegetables for the tropics and subtropics.

• All a re below 200 m i n elevation, a nd temperatures a re typical of the lowland tropics.

• Emerging paradigms of tree phenology in dry tropics.

• Shading improved dry-season survival while competition for moisture had significant effects on seedling performance compared with tree seedlings in the humid tropics.

• Successful establishment of seedlings in the dry tropics is dependent mainly upon moisture availability.

• Therefore, soil moisture conservation is crucial for maintaining soil biological processes in smallholder cropping systems, especially in sub-humid and semi-arid tropics.

• Low soil water availability decreases decomposition rates in the dry sub-humid and semi-arid tropics despite their higher temperatures.

• Parasitic organisms are found in almost every environment ranging from the extremes of cold conditions in the polar regions to hot climates in the tropics.

• Maesopsis continues to be introduced as a rapid-growing timber species in plantations throughout the tropics.

• In the nineteenth century some people in the tropics took opium believing that it would be effective against malaria.

• In the tropics, for example, age determination on a broad scale - especially with so many species, is simply beyond the reasonable reach of analysts.

• Both traits showed geographic variation and strong non-linear clines with a sharp reduction in size in the tropics.