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Effect of nitrogen rate and fertilizer nitrogen source on physiology, yield, grain quality and nitrogen use efficiency in corn.

Biswas, D.K., and B.L. Ma. 2016. Effect of nitrogen rate and fertilizer nitrogen source on physiology, yield, grain quality and nitrogen use efficiency in corn. Can. J. Plant Sci. 96: 392–403.

Abstract

A two-year (2010-2011) field experiment was undertaken to examine the effect of nitrogen (N) rate (0, 100, 150, 200 kg N ha-1) and N source (Urea, Calcium ammonium nitrate; Ammonium sulphate) on canopy reflectance, chlorophyll pigments, photosynthesis, yield, grain quality and N-use efficiency in corn. However, the physiological observations were made only in 2011. We found that stover biomass was unaffected by higher N rate beyond 150 kg N ha-1 in both years. Higher N rates did not provide a yield advantage as compared to 150 kg N ha-1in 2010, but the highest grain yield was produced with 200 kg N ha-1in 2011. The higher grain yield by N application was attributed to a greater kernel size in both years. Corn stover N was found to increase with increasing N rates in both years. Kernel N only responded to the high N rate in 2010. There was no change in the kernel density as affected by N rate in both years. An increased N addition resulted in a decrease in both N-uptake efficiency and agronomic-N use efficiency in both years. There was an inconsistent effect of N source on yield and N use efficiency indices in the corn over two years.

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