Skip to main content Accessibility help

Growth of Johnsongrass Selections Under Different Temperatures and Dark Periods

  • G. W. Burt (a1) and I. M. Wedderspoon (a2) (a3)


The differential response of three selections of johnsongrass (Sorghum halepense (L.) Pers.) to different temperatures and dark periods was studied in two experiments conducted in growth chambers. The three selections of johnsongrass were obtained from locations representing different climates. At 20 C all three selections grew equally with respect to most parameters of growth studied; however, at 35 C the selection from the southern climate produced more total fresh weight than the other two selections. Rhizome production and the number of stems also were greater in the southern selection at 35 C. An 8-hr dark period prevented flowering in all three selections and significantly reduced rhizome production in two selections compared to the 12-hr dark period. Flowering occurred most rapidly in the selection from a northern climate and most slowly in the selection from a southern climate. The results are discussed in relation to the possible plant adaptive changes and the possibility of weed control through dark period interruption.



Hide All
1. Anderson, L. E., Appleby, A. P., and Weseloh, J. W. 1960. Characteristics of johnsongrass rhizomes. Weeds 8:402406.
2. Bennett, H. W. 1940. Variations in Johnson and Dallis grass. Assoc. So. Agr. Workers Proc. 41:8586.
3. Hamilton, K. C. and Tucker, H. 1964. Response of selected and random plantings of johnsongrass to dalapon. Weeds 12:220222.
4. Hamner, K. C. and Bonner, J. 1938. Photoperiodism in relation to hormones as factors in floral initiation. Bot. Gaz. 100:388431.
5. Hoagland, D. R. and Arnon, D. I. 1950. The water culture method of growing plants without soil. California Agr. Exp. Sta. Circ. 347. 32 p.
6. Holm, L. 1969. Weed Problems in Developing Countries. Weed Sci. 17:113118.
7. Hull, R. J. 1969. Translocation of assimilates and dalapon in established johnsongrass. Weed Sci. 17:314320.
8. Ingle, M. and Rodgers, B. J. 1961. The growth of a midwestern strain of Sorghum halepense under controlled conditions. Amer. J. Bot. 48:392396.
9. King, L. J. 1966. Weed ecotypes–a review. Proc. No. East. Weed Control Conf. 20:604611.
10. McWhorter, C. G. 1961. Morphology and development of johnsongrass plants from seeds and rhizomes. Weeds 9:558562.
11. Oyer, E. B., Gries, G. A., and Rodgers, B. J. 1959. The seasonal development of johnsongrass plants. Weeds 7:1319.
12. Sturkie, D. G. 1930. The influence of various top-cutting treatments on rootstocks of johnsongrass (Sorghum halepense). J. Amer. Soc. Agron. 22:8293.
13. Taylorson, R. B. and McWhorter, C. G. 1969. Seed dormancy and germination in ecotypes of johnsongrass. Weed Sci. 17:359361.
14. Vinall, H. N. 1926. Johnsongrass: Its production for hay and pasturage. U. S. Dep. Agr. Farmers Bull. 1476. 21 p.
15. Woodman, R. M. 1939. Studies in the nutrition of vegetables. The effects of variation in the nitrogen supply on lettuce (v. May King) in sand culture. Ann. Bot. Land. ns. 3:649656.

Growth of Johnsongrass Selections Under Different Temperatures and Dark Periods

  • G. W. Burt (a1) and I. M. Wedderspoon (a2) (a3)


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed