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This article in SSSAJ

  1. Vol. 31 No. 2, p. 231-235
     
    Received: Aug 24, 1966
    Published: Mar, 1967


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doi:10.2136/sssaj1967.03615995003100020026x

Potassium Nutrition Effects on Net Photosynthesis and Morphology of Alfalfa1

  1. R. B. Cooper,
  2. R. E. Blaser and
  3. R. H. Brown2

Abstract

Abstract

Greenhouse experiments were conducted to study the influence of K on CO2 assimilation, growth, and morphological characteristics of alfalfa (Medicago sativa L.). Yield increases were consistently obtained with high K. Added K increased plant height. The rate of leaf accumulation, leaf size, and weight per unit area also increased as did stomatal number and aperture. More and larger epidermal cells per leaf were observed with high K nutrition. Net photosynthesis rates of excised leaves increased with K application. Leaves from plants with added K had lower CO2 compensation points, indicating higher efficiency of CO2 assimilation under limiting CO2 conditions.

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