Answer:
B. four-crop rotations
Explanation:
The rotation of crops consists of alternating plants of different families and with different nutritional needs in the same place during different cycles, avoiding that the soil is exhausted and that the diseases that affect a type of plants are perpetuated in a determined time.
In this way the fertilizer is better used (by using plants with different nutrient needs and different root systems), weeds are better controlled and problems with pests and diseases are reduced (since no host is more difficult to find) survive).
In the mid-1700s, Viscount Charles "Nabo" Townshend introduced a new method of crop rotation to England that created much higher yields. He divided his acres into the four fields of ryegrass or clover; wheat; oats or barley; and turnips. Cattle graze on ryegrass or clover. The clover, with its structure rich in nitrogen, was much more nutritious than regular grass. the manure of the animals is reinvested in the earth as fertilizer. In this system, all fields are used to produce food or feed, increasing both grain yields and livestock productivity. In the year 1800, many European farmers had begun to follow the example of Townshend.
