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Published online 1 September 1970
Published in Agron J 62:667-668 (1970)
© 1970 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Plant Population and Harvest Date on Stem Yield and Growth Components of Kenaf in Maryland1

J. J. Higgins and G. A. White2

Kenaf is a potential new annual crop source of paper pulp. To minimize storage stockpiling of this new, bulky raw material, pulp processors may begin harvesting well before killing frosts and continue for several months beyond. Possible stem yield reductions with this extended harvesting system and the influence of plant populations on the reductions becomes of practical concern. The effects of four populations and five harvest dates on stem yields and other growth components on kenaf variety ‘Everglades 71’ were studied at Glenn Dale, Md., in 1966 and 1967. Populations of 99, 198, 297, and 395 thousand plants/ha did not affect stem yield or plant height in 1966 or yield in 1967. Basal stem diameters decreased as populations increased. There was a gradual loss of plants as harvesting was delayed. The greatest loss of about 25% was for the highest population. The best stem yields across the four populations were obtained from Oct. 4, 1966, (13.5 mt/ha) and Nov. 7, 1967, (11.7 mt/ha) harvests. These data indicate that populations of 200 to 300 thousand plants/ha and harvesting at about the time of killing frosts will result in the highest stem yields of kenaf under Maryland conditions.

Key Words: Hibiscus cannabinus L. • Pulp crop

1 Contribution of the Crops Research Division, Agricultural Research Service, U.S. Departnlent of Agriculture.

2 Research Plant Physiologist aud Research Agronomist, Crops Research Division, ARS, USDA, Plant Introduction Station, Glenn Dale, Md. 20769, and Behsville, Md. 20705, respectively.

Received for publication January 26, 1970.




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Copyright © 1970 by the American Society of Agronomy.