About Us | Help Videos | Contact Us | Subscriptions
 

Crop Science Abstract -

Effect of Upper-Profile Soil Water Potential on Numbers of Cysts of Heterodera glycines on Soybeans1

 

This article in CS

  1. Vol. 22 No. 4, p. 833-835
     
    Received: Aug 24, 1981


 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2135/cropsci1982.0011183X002200040031x
  1. Larry G. Heatherly,
  2. L. D. Young,
  3. J. M. Epps and
  4. E. E. Hartwig2

Abstract

Abstract

Upper-profile (0 to 15 cm) soil water potential (SWP) was maintained at four levels in a greenhouse study to determine the effect of these soil moisture regimes on cyst formation by Heterodera glycines (Ichinohe) on soybeans [Glycine max (L.) Merr.]. Number of cysts increased significantly above initial levels in the wet (−0. I to −0.2 bar SWP) and optimum (−0.3 to −0.4 bar SWP) soll moisture treatments. The optimum soil moisture treatment had the highest number of cysts at termination. Root weight in the 0 to 15-cm zone was highest in the wet treatment and lowest in the dry treatment (−0.6 to −0.7 bar). Number of cysts in the 15 to 45-cm depth zone of all treatments (equally wet at −0.25 to −0.35 bars) increased significantly above initial levels and reached a level essentially equal to the number of cysts in the 0 to 15-cm zone of the optimum soil moisture treatment. No difference in root mass or number of cysts was measured in the deeper zone. Shoot weight and height were not significantly different among treatments, but a decrease in leaf area index with increasing dryness of the upper soil zone indicated moisture stress. The similar shoot weights among treatments indicated that the cyst levels in the wet and the optimally wet treatments may have reduced plant development, since the wetter soil should have increased shoot growth.

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

Copyright © .