Fertigation is simply placing fertilizer into irrigation water to both feed and water crops at the same time. The scheduling is based on the water needs of the crop first, then adding fertilizer as the crop needs it and it is convenient to add into the irrigation water.
drip fertigation
You have to prepare the soil by tilling it, and then you can use the land to plant crops.
Cultivate
it powerd their machines used to prepare grains and other crops
To prepare land for the growing of crops.
They could prepare the land and plant more crops.
Because different crops behave differently in the same or different growing/climatic conditions. Losses for oilseed crops are different than cereal crops, for instance.
A field is tilled to prepare the ground for seeds in order to grow crops.
The land was arable, allowing the farmer to plant successful crops.
Different crops are grown in different seasons as each crop has a time to grow.
Crops are dependent on different types of soil, because the acidity of the soil will define what crops can grow in it.
As with most Native Americans they hunted for food and had crops they grew.