Effective and economic storage of pigeonpea seed in triple layer plastic bags

Abstract

Pigeonpea [Cajanus cajan (L.) Millsp.] seed stored in triple layer Purdue Improved Cowpea Storage (PICS) bags for eight months retained germination and seed integrity significantly better than seed stored in traditional gunny bags. PICS bags prevented major damage caused by bruchids (Callosobruchus maculatus F.), while grain stored in gunny bags suffered severe losses. The aflatoxin levels in stored seed were low and not significantly different between the two storage systems. The levels of O₂ in PICS bags artificially infested with C. maculatus dropped rapidly during the first month of storage while the levels of CO₂ increased. Even in absence of bruchids (noninfested seed) PICS bags preserved seed germination for extended periods of time better than gunny bags; possibly due to the higher and more stable relative humidity inside the PICS bags. Higher seed germination would result in improved plant stands in the field and subsequent higher yields and increased productivity. Thus, PICS bags have shown potential to positively impact the economy of pigeonpea farmers in the semi-arid tropics.Keywords: Seed vigor, Cajanus cajan (L.) Millsp., Callosobruchus maculatus F., Bruchids, Aflatoxins, Seed viabilit