Chlorophyll Content and Growth of Soybean Plants: Possible Interaction of Iron Availability and Day Length

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Science  29 May 1964:
Vol. 144, Issue 3622, pp. 1134-1135
DOI: 10.1126/science.144.3622.1134


Data indicate a relationship between the availability of iron and the response of "Hawkeye" soybeans to day length. The more readily available the iron, the less influence an increase in day length on dry weight. When iron was present but not chelated the plants remained green in a 16-hour day but became chlorotic in a 9-hour day.

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