Abstract
Field corn (Zea mays L.) experiments were conducted in the field in a 7-yr study to determine the cause of poor growth on summer-fallowed land and find a means of reducing the problem. Low phosphorus (P) levels in seedling tissue were associated with the poor growth. The symptoms were most severe where P levels in the soil were low, spring temperatures high and soil moisture low. The addition of P fertilizer with the seed greatly improved seedling growth of the corn and sometimes increased grain yield.Key words: Field corn, Zea mays L., summer fallow, phosphorus
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