Analysis of Long Term Study Indicates Both Agronomic Optimal Plant Density and Increase Maize Yield per Plant Contributed to Yield Gain.

Sci Rep · 2018 · PMC5862987 · PMID 29563534

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an increasing trendno p-value reported

An increasing trend of plant density at rate of 597 plants ha −1 yr −1 for the years 1939–2009 was reported for Kansas 12 .

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a positive trendno p-value reported

Same study indicated a positive trend for kernel weight for US, Canada and Argentinian hybrids.

also in 11,005 other papers

Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.