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High relative humidity increases yield, harvest index, flowering, and gynophore growth of hydroponically grown peanut plantsGrowth chamber experiments were conducted to study the physiological and growth response of peanut (Arachis hypogaea L.) to 50% and 85% relative humidity (RH). The objective was to determine the effects of RH on pod and seed yield, harvest index, and flowering of peanut grown by the nutrient film technique (NFT). 'Georgia Red' peanut plants (14 days old) were planted into growth channels (0.15 x 0.15 x 1.2 m). Plants were spaced 25 cm apart with 15 cm between channels. A modified half-Hoagland solution with an additional 2 mM Ca was used. Solution pH was maintained between 6.4 and 6.7, and electrical conductivity (EC) ranged between 1100 and 1200 microS cm-1. Temperature regimes of 28/22 degrees C were maintained during the light/dark periods (12 hours each) with photosynthetic photon flux (PPF) at canopy level of 500 micromoles-m-2s-1. Foliage and pod fresh and dry weights, total seed yield, harvest index (HI), and seed maturity were greater at high than at low RH. Plants grown at 85% RH had greater total and individual leaflet area and stomatal conductance, flowered 3 days earlier and had a greater number of flowers reaching anthesis. Gynophores grew more rapidly at 85% than at 50% RH.
Document ID
20040088619
Acquisition Source
Kennedy Space Center
Document Type
Reprint (Version printed in journal)
Authors
Mortley, D. G.
(Tuskegee University Tuskegee, AL 36088, United States)
Bonsi, C. K.
Loretan, P. A.
Hill, W. A.
Morris, C. E.
Date Acquired
August 21, 2013
Publication Date
February 1, 2000
Publication Information
Publication: HortScience : a publication of the American Society for Horticultural Science
Volume: 35
Issue: 1
ISSN: 0018-5345
Subject Category
Man/System Technology And Life Support
Funding Number(s)
CONTRACT_GRANT: NAG10-0024
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Life Support Systems
Non-NASA Center

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