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Relationships Between N Response, Plant Population, and Row Width on Growth and Yield of Corn¹

The leaf area index increased linearly as the plant population of corn (Zea mays L.) was increased from 34,500 to 69,000 plants per hectare. The leaf area per plant, however, decreased as the plant population increased. Nitrogen rates of 112 to 280 kg per hectare and row width had no effect on leaf area per plant nor the leaf area index.

The yield of grain per plant was dependent upon the leaf area per plant. The efficiency of a given leaf area to produce grain was higher as nitrogen rates increased.

The yield of grain per hectare of the long season hybrid was not influenced by row width except under drought conditions where 53-cm wide rows gave higher yields than 106-cm wide rows. Highest grain yields were obtained at 280 kg of N per hectare and 51,750 plants per hectare. Maximum yields were obtained with a leaf area index of 3.5 and remained constant up to an index of 4.5 with adequate nitrogen.

Key Words: Leaf area index

² Former graduate student and now Professor de Suelos, Colegio de Post-graduados, Escuela Nacional de Agricultura, Chapingo Mexico and Professor of Soil Science, North Carolina State University, respectively.

Received for publication August 10, 1968.

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