Now if a farmer plant the same crop in the same field each year

Now if a farmer plant the same crop in the same field each year

Now if a farmer plant the same crop in the same field each year, that crop soon uses up all of the available plant food that it likes. Hence the soil can no longer properly nourish the crop that has been year by year robbing it. If that crop is to be successfully grown again on the land, the exhausted element must be restored.

Fig. 25. Grass following Corn

Fonte: Agriculture for Beginners