The tubercles on the pea or clover roots will furnish that

The tubercles on the pea or clover roots will furnish that

It should be remembered always in buying fertilizers for wheat that whenever wheat follows cowpeas or clover or other legumes there is seldom need of using nitrogen in the fertilizer; the tubercles on the pea or clover roots will furnish that. Hence, as a rule, only potash and phosphoric acid will have to be purchased as plant food.

Source: Agriculture for Beginners