以下の英文はどう訳しますか？？
以下の英文はどう訳しますか？？
中間から後半に書けてが特に難しくとても困っています。。。
お願いします！！
Valley farming was in sharp contrast. A great variety of crops were sown on the steep lower slops in field that were mostly walled to protect crops from livestock and define the boundaries against neighbors. The dominant crop was maize, of which Paucartambo farmers cultivated about 10 percent of the 100 or more races that exist in Latin America. Wheat, as important as maize in lower and diver valleys, was not a significant crop here. In the Uchucamarca valley, to the northwest, wheat provided about half the calories and proteins available in the early 1970s (Brush 1977:78). The second most important crop in the valley farming of Paucartambo was quinoa. The nitrogen-fixing legumes tarwi (Lupinus mutabilis) and broad beans (Vicia faba) were less commonly field dominants, with lower yields. Valley land was scare, not available to all households, and was used intensively. Intercropping was a common practice and had increased since the 1960s. Formerly, tarwi and broad beans were grown mainly higher on the slopes, but in the Paucar-tambo valley more than in other areas there has been a reduction in their area as sole crops. They were interplanted in rows with amaranths, kidney beans, squashes, and quinoa, and also in gaps and corners of valley field dominated by maize. Livestock manure, guano from the coast, and chemical fertilizers were used, together with crop rotation, to reduce fertility exhaustion
