Fertilisers are commonly used. These are often high in Nitrogen compounds, especially ammonia.
Irrigation
they used water and cow manure to fertilize the crops just right
Most of the West African farmers grow crops on community land. Villages have small land patches where anyone in the village is free to grow crops. A lot of the crops are used for subsistence.
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Farmers grow crops to make a living for themselves and their families. Many choose to do this rather than use other means of making a living because they like the idea of providing food for others. Crops are uses directly as food for people, or as the ingredients in processed food for people. They can also be used to feed animals that are raised for food. some crops are grown to make useful things, like cotton for clothing, wood for housing, etc., and some are used to produce ethanol and biodegradable plastics.
Terracing was (and in some cases still is) used to grow crops on hillsides and mountains.
Kind of. Farmers can grow things like corn and soybeans, both of which can be used to make plastics.
The farmers in the Aztec empire used chinampas, which were artificial islands in lakes, to grow crops.
By using the floods for the rich soil
They were Used to plant crops and make them grow better
Farmers use fertilizer because they need it for their crops to grow very big and be sold for more and more easily. It is also because as you use the same land repeatedly for farming the essential nutrients from the soil drops. So to enhance the nutrients in the soil for the plants or crops to grow faster the farmers add the required fertilizers to the soil. Care should be taken in not using excessive fertilizer which might damage the crops.
Fertilizer is a substance that is used to make crops grow. The Native Americans showed the Pilgrims how to make crops grow by planting dead fish with the seeds. Often manure is used as a fertilizer to make crops grow. Chemicals are used as well to keep bugs, and animals, away, but, the chemical use of fertilizer can have negative side effects.