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Effect of Nitrogen Rates at Different Growth Stages on Corn Yield and Common Smut Disease ( Ustilago maydis (D.C.) Corda)

Effect of Nitrogen Rates at Different Growth Stages on Corn Yield and Common Smut Disease (... The effect of N fertilizer rates and time of N application on plant growth, N %, N uptake, smut index and yield response of corn were investigated in the field during the summer seasons 1988 and 1989. Increasing N rate from 30 to 60 and/or 90 kg/acre produced greater response on the studied parameters, followed by a limited response at 120 kg N/acre. Opposite results were detected on yield losses, owing to the severity of smut infection. Single application of N at planting was the least productive for DM and grain yields, compared with 2‐split or 3‐split N treatments. On the other hand, splitting N application at planting and 16‐leaf growth stages produced limited smut infection with greater increase in grain yield and lowest DM and N accumulations. The results also showed that 3‐split N treatment acted to accelerate the vigour growth and N uptake to a greater extent, creating more favourable conditions for stimulating smut infection, with an attendant increase on yield losses. Because of the advantage of applying 90 kg N/acre over the N treatments on the measured parameters, with particular reference to yield potential and smut performance, attention was given to splitting N fertilizer at planting and 16‐leaf growth stages. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Agronomy and Crop Science Wiley

Effect of Nitrogen Rates at Different Growth Stages on Corn Yield and Common Smut Disease ( Ustilago maydis (D.C.) Corda)

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References (19)

Publisher
Wiley
Copyright
Copyright © 1991 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0931-2250
eISSN
1439-037X
DOI
10.1111/j.1439-037X.1991.tb00933.x
Publisher site
See Article on Publisher Site

Abstract

The effect of N fertilizer rates and time of N application on plant growth, N %, N uptake, smut index and yield response of corn were investigated in the field during the summer seasons 1988 and 1989. Increasing N rate from 30 to 60 and/or 90 kg/acre produced greater response on the studied parameters, followed by a limited response at 120 kg N/acre. Opposite results were detected on yield losses, owing to the severity of smut infection. Single application of N at planting was the least productive for DM and grain yields, compared with 2‐split or 3‐split N treatments. On the other hand, splitting N application at planting and 16‐leaf growth stages produced limited smut infection with greater increase in grain yield and lowest DM and N accumulations. The results also showed that 3‐split N treatment acted to accelerate the vigour growth and N uptake to a greater extent, creating more favourable conditions for stimulating smut infection, with an attendant increase on yield losses. Because of the advantage of applying 90 kg N/acre over the N treatments on the measured parameters, with particular reference to yield potential and smut performance, attention was given to splitting N fertilizer at planting and 16‐leaf growth stages.

Journal

Journal of Agronomy and Crop Science – Wiley

Published: Jul 1, 1991

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