Pigeon pea (Cajanus cajan) is a multipurpose
legume with a long tradition of cultivation in Hawaii
(Valenzuela and Smith, 2002). Frederick
Krauss from the University of Hawaii was among
its earliest promoters in the state, with several
extension publications authored in the 1930s
proclaiming its value as a soil builder. Pigeon
peas are among the top ten legumes grown
globally, along with common beans, peas,
chickpeas, broad beans and lentils. Sir Albert
Howard, an early pioneer of organic farming,
was also an advocate of the value of pigeon
peas to improve soil fertility, as observed in his
travels through India.