Sites occupied by such people are located in southwestern Asia, in what are now Iran, Iraq, Israel, Jordan, Syria, and Turkey; in southeastern Asia, in what is now Thailand; in Africa, along the Nile River in Egypt; and in Europe, along the Danube River and in Macedonia, Thrace, and Thessaly.Early centers of agriculture have also been identified in the Huang He (Yellow River) area of China; the Indus River valley of India and Pakistan; and the Tehuacan Valley of Mexico, northwest of the Isthmus of Tehuantepec.rt, science, and industry of managing the growth of plants and animals for human use.
It is regulated by international agreements such as the General Agreement on Tariffs and Trade and by trading areas such as the European Community.The Food and Agricultural Organization (FAO) of the UN directs much attention to agricultural trade and policies.Fruits, vegetables, and olives are also major foods for people; feed grains for animals include soybeans, field corn, and sorghum.Separate articles on individual plants and animals contain further information. The average size of a single landholding in the Philippines, however, may be somewhat less than 3.6 ha (less than 9 acres), and in Indonesia, a little less than 1.2 ha (less than 3 acres). Commercial farming, or production for cash, is usually on large holdings.Genetics has also placed livestock breeding on a scientific basis.
Hydroponics, a method of soiless gardening in which plants are grown in chemical nutrient solutions, may solve additional agricultural problems.The importance of an individual country as an exporter of agricultural products depends on many variables.Among them is the possibility that the country is too little developed industrially to produce manufactured goods in sufficient quantity or technical sophistication.Airplanes and helicopters are employed in agriculture for such purposes as seeding, transporting perishable products, and fighting forest fires, and in spraying operations involved in insect and disease control.Radio and television disseminate vital weather reports and other information that is of concern to farmers.Such agricultural exporters include Ghana, with cocoa, and Burma (Myanmar), with rice.