About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in AJ

  1. Vol. 59 No. 4, p. 311-314
     
    Received: Oct 12, 1966
    Published: July, 1967


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/agronj1967.00021962005900040007x

Potassium and Sodium Interrelations in Growth and Mineral Content of Italian Ryegrass1

  1. L. O. Hylton2,
  2. A. Ulrich3 and
  3. D. R. Cornelius2

Abstract

Abstract

Growth and mineral content of Italian ryegrass were affected by K and Na treatments when studied by a nutrient solution technique. Potassium influenced plant growth more than did Na. Sodium substituted partly for K in top growth when K was low in the nutrient solution. Changes in the amount of K in solution affected leaf and tiller sizes more than numbers. Visual K deficiency symptoms were delayed and were less severe when Na was high in the solution.

Potassium and Na concentrations in all plant parts were directly related to K and Na treatments. Potassium concentration was higher in old blades than in young blades when plants were K deficient, regardless of Na treatment. Sodium concentration, unlike K, generally decreased with increased blade age. Potassium and Na concentrations in the stem were high, compared to other plant parts.

The youngest blade that was fully open and had a ligule, blade 1, was determined to be the best plant part to sample. It was necessary to determine Na in addition to K in blade 1 in order to diagnose the K status of the ryegrass adequately. The critical K concentration was 0.8% for blade 1 tissue that contained more than 2.4% Na, dry basis. The critical K concentration was 3.5%, however, for blade 1 tissue diat contained less than 0.3% Na, dry basis.

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

Copyright © .