The paper illustrates the point by undertaking two different RCTs on cowpea seeds in Tanzania.
Alfalfa, however, unlike the cowpea, does not take to poor land.
The preparation of the soil should be more thorough than that often given the cowpea.
Few plants equal the cowpea in repaying careful preparation.
Comparison is made on the basis of equal adaptability of soil and climate to clover and the cowpea.
Carefully dig up a root of clover, cowpea, soy bean or other legume and wash the soil from it.
On the other hand, a stand of cowpea plants is surer in the case of soils that crust, and germination runs higher.
In addition each ton of cowpea vines contains ten pounds of phosphoric acid and twenty-nine pounds of potash.
There is an average of about forty-seven pounds of nitrogen in each ton of cowpea vines.
Aside from its value as a green manure crop the cowpea is useful as food for man and the farm animals.