My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in AJ

  1. Vol. 70 No. 6, p. 995-998
     
    Received: Apr 5, 1978
    Published: Nov, 1978


 View
 Download
 Alerts
 Permissions

doi:10.2134/agronj1978.00021962007000060026x

Growth and Yield of Maize as Affected by Early-Season Defoliation1

  1. R. R. Johnson2

Abstract

Abstract

Complete defoliation of maize (Zea mays L.) at the five-leaf stage has been reported to increase the grain yield of early-season hybrids in the northern U.S. corn belt while similar treatments have generally reduced yields of full-season hybrids. The objective of this study was to extend this research to the central corn belt by measuring the effect of defoliation at the five-leaf stage on grain yield of maize hybrids differing in maturity. Yield responses were related to growth characteristics. Field experiments conducted at two Illinois locations during a 2-year period indicated that defoliation reduced average grain yields 10 to 13% regardless of maturity class. Defoliation also reduced plant height, leaf number, leaf area, and percentage grain protein. Defoliation delayed pollen shed and silking but did not change the pollen shed to silking interval. In some experiments lower grain yields from defoliation were associated with a slight decrease in plant population, but reduced ear size was the primary factor causing the decreases in yields. Reduced leaf area probably decreased the supply of photosynthate resulting in smaller ear weight.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .

Facebook   Twitter