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. 62 No. 1, p. 71-74
    Received: June 25, 1969

Request Permissions


Automated Precision Balance System for Measuring Transpiration from Large Individual Plants1

  1. Donald G. Harris2



Two automated balances are described which are suitable for intensively monitoring transpiration rates of individual plants. Accurate estimates for 1-min intervals are possible for a large plant. Both units provide continuous electrical signals for automated control functions, analog recording, and data logging.

The two balances have load capacities of 10 kg and 100 kg, with identical precisions of 0.1-g weight change over a 40-g range. Total weight is maintained within the range by the automatic addition of compensation weights. Compared to all earlier automated transpiration balances, the 100-kg system has a precision to load ratio which is about eight times better. Improvements have also been made in damping for short-term air movement disturbances and in data collection. The balances require a minimum of operational precautions and are rugged, stable, and reasonably priced.

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

Copyright © .