Agriculture: The Food We Grow and Animals We Raise by Julie Kerr Casper PDF

By Julie Kerr Casper

ISBN-10: 0816063524

ISBN-13: 9780816063529

Explores the most very important makes use of of the land: the construction of agriculture. This e-book is helping readers research that farms and ranches produce even more than nutrition; yet scientists, farmers, ranchers, and different landowners have not solved conservation difficulties - but.

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Some of these introduced plants may have become weeds. When plants are introduced to a new environment, they may not have any natural enemies to keep them under control. Because of that, they are not destroyed by disease, insects, or other predators. Without any natural enemies—some of these plants become invasive (grow where they are not wanted) and lower the diversity and quantity of native plants. Weeds are spreading rapidly in the United States. According to the Bureau of Land Management, in the western United States, weeds are 21 22 agriculture Facts About Weeds Purple Loosestrife • Each flowering stalk can produce 100,000 to 300,000 seeds each year.

For practical applications, some scientists consider a renewable resource one that can be replenished within one generation (approximately 20 to 30 years) and a nonrenewable resource one that cannot be replenished in one generation. 39 40 agriculture For many classes of resources, it is easy to determine which resources are renewable and which are not. For example, with energy resources, fossil fuels (oil, petroleum) and coal are not renewable because they took millions of years to form. Even though the same geological processes are still happening today, these resources will not be replaced within our lifetime, so they are considered nonrenewable.

Soil erosion caused by human activity is The history of american farming one of the most destructive erosional forces. Because artificially created erosion can happen much more quickly than natural geologic erosion, it is sometimes referred to as accelerated erosion. Human activity on the landscape can significantly contribute to soil erosion. In a natural state, vegetation serves as natural protection against erosion because the network of roots helps hold the soil in place against various erosive forces, such as wind and water.

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Agriculture: The Food We Grow and Animals We Raise by Julie Kerr Casper

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