Corn, the preferred staple crop in many countries, requires large amounts of nitrogen for its growth. Usually fertilizer is necessary to sustain good yields. A Penn State graduate student, Ylva Besmer, is trying to find ways to improve corn yield for subsistence farmers in Zimbabwe without fertilizer.
"The government of Zimbabwe no longer provides a subsidy for fertilizer, resulting in significantly lower corn yields" says Besmer, a doctoral candidate in ecology. "The old-fashion use of legumes (members of the bean family) in crop rotations may prove to be a solution to this problem because of their ability to fix nitrogen and, thus, provide nitrogen for subsequently grown corn. We have shown in Zimbabwe, however, that legume growth and nitrogen fixation can be limited by the availability of phosphorus in the soil."
In order to improve nitrogen fixation in legumes, somehow phosphorus availability has to be increased.
Andrea Elyse Messer | EurekAlert!
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