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The N concentration of a soybean Glycine max. [(L.) Merr.] seed frequently is greater than 60 mg g −1 . Because of high seed-N demand, a soybean plant may become N-deficient during pod fill. To test the effect of N source during pod fill on seed N, plants were grown hydroponically so that N source could be controlled. From seedling stage to mid-R4, all plants were provided an excess of nitrate-N...
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