About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in CS

  1. Vol. 10 No. 4, p. 345-349
     
    Received: Nov 7, 1969
    Published: July, 1970


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2135/cropsci1970.0011183X001000040008x

Influence of Different Defoliation Systems on the Regrowth of Pearl Millet, Hybrid Sudangrass, and Two Sorghum-Sudangrass Hybrids from Terminal, Axillary, and Basal Buds1

  1. John G. Clapp and
  2. Douglas S. Chamblee2

Abstract

Abstract

Stubble heights of 8, 10, 15, and 25 un were imposed on ‘Gahi-1’ pearl millet (Pennisetum typhoides [Burm.] Stapf. and C. E. Hubb.), ‘Haygrazer’ and ‘Sudax SX-12’ sorghum-sudangrass hybrids (Sorghum vulgare Pers. ✕ Sorghum sudanense Stapf.), and ‘Trudan II’ sudangrass hybrid (Sorghum sudanense Stapf.) at either the first, second, or third harvest with other harvests being cut to a uniform height. Considering all cultivars tested, marked reductions in yields were obtained when they were defoliated to 8 cm as compared with 25 cm for 21 out of 24 harvests (87% of the harvest). Net gains in yield ranging from 1,203 to 2,039 kg/ha were realized within a 30-day growth period by raising the stubble height from 8 to 25 cm at a single harvest. Dry matter production was influenced more by variation in stubble heights at the second harvest than when these same variations were imposed at the first or third harvest.

Gahi-1 pearl millet showed a different regrowth pattern than sorghum-sudangrass or sudangrass hybrids, as regrowth was more dependent on terminal buds and less on tillering. Regrowth from terminal buds increased for all the summer annual cultivars as the height of defoliation was raised from 8 to 25 cm. Basal and axillary tillering increased as the height of defoliation was lowered from 25 to 8 cm for the sorghum-sudangass hybrids. The nitrogen content of the forage was not reduced when the harvest height was lowered from 25 to 8 cm at the first or second harvest.

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

Copyright © .