About Us | Help Videos | Contact Us | Subscriptions

Members of ASA, CSSA, and SSSA: Due to system upgrades, your subscriptions in the digital library will be unavailable from May 15th to May 22nd. We apologize for any inconvenience this may cause, and thank you for your patience. If you have any questions, please call our membership department at 608-273-8080.


Institutional Subscribers: Institutional subscription access will not be interrupted for existing subscribers who have access via IP authentication, though new subscriptions or changes will not be available during the upgrade period. For questions, please email us at: queries@dl.sciencesocieties.org or call Danielle Lynch: 608-268-4976.



This article in AJ

  1. Vol. 79 No. 3, p. 517-519
    Received: Aug 5, 1986

Request Permissions


Soil Water Effects on Low-Temperature Seedling Emergence of Five Brassica Cultivars1

  1. S. C. Rao and
  2. T.H. Dao2



Identifying Brassica that are least sensitive to cool soil temperature and variable soil water availability during early spring is important to fill the forage deficit period in the southern Great Plains. A growth chamber study was conducted to determine the effect of soil water potential under low temperatures on the rate and total emergence for three Brassica spp. in Dale sandy loam (fine-silty, mixed, thermic Pachic Haplustolls). Three turnip (Brassica rapa L.) cultivars, Purpletop, Cyclon and Tyfon, ‘Merlin’ kale (B. oleracea L.) and ‘Winfred’ rape (B. napus L.) were evaluated at a soil temperature of 7.5°C and five soil water potentials (−10, −30, −100, −250, and −500 kPa). Total emergence and rate of emergence of all cultivars were not affected by change in soil water potentials between −10 and −100 kPa. Soil water potential of −250 kPa reduced total emergence, whereas both rate and total emergence were greatly reduced with decrease in soil water potential from −250 to −500 kPa. Differences in total emergence were observed among cultivars even though seed germination potentials of all cultivars were similar. Purpletop turnip and Winfred rape were higher in total emergence and emerged in a shorter period under sub-optimal environment conditions, comparedto other cultivars.

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

Copyright © .