Answer:
<em>Rain forests provide important ecological services, including storing hundreds of billions of tons of carbon, buffering against flood and drought, stabilizing soils, influencing rainfall patterns, and providing a home to wildlife and indigenous people. Rain forests are also the source of many useful products upon which local communities depend.
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<em>While rain forests are critically important to humanity, they are rapidly being destroyed by human activities. The biggest cause of deforestation is conversion of forest land for agriculture. In the past subsistence agriculture was the primary driver of rain forest conversion, but today industrial agriculture — especially mono-culture and livestock production — is the dominant driver of rain forest loss worldwide. Logging is the biggest cause of forest degradation and usually proceeds deforestation for agriculture.</em>
The correct answer is - II and III.
The agribusiness has been helping a lot to the people in the developing countries around the world, mostly with better food supply and the support in the traditional agricultural practices.
The better food supply comes from the proper distribution of the food on the home markets, and it is also food that is produced in the country, not imported one, so everyone sees the benefit from it.
The support in the traditional agricultural practices is also very important, as the farmers are managing to get easy access to the things they need for farming, but also they have secured market for their products. The traditional agricultural practices are also supported as in those ways it is possible to produce organic food, for which there's an ever growing market.
Recommended rates of potash for grazed grass are 60kg/ha and 30kg/ha of K2O for soil index 0 and 1 respectively. For soils with higher soil fertility levels no potash required.
Very large quantities of potash are removed in grass silage which must be replaced to maintain soil fertility and yield potential. The following is guide to typical potash offtakes from multi-cut silage systems.Low soil magnesium levels will affect grass yield as well as mineral balance in the animal. Apply 50-100 kg/ha MgO every three to four years at Mg index 0. Yield response is less certain at index 1 but magnesium application is justified in terms of insurance for grass yield and mineral balance for the animal, to maintain a soil magnesium index of 2.
Where lime is required and Mg levels are 0 and 1, use magnesian limestone as the most cost effective magnesium source. Where pH is satisfactory, specific magnesium fertilisers (see table below) should be used for soil improvement. Use water soluble forms of magnesium where rapid plant uptake is required.
The study of the physical elements of the earth is the answer
