Abstract:
Among all ordinary weeds species encountered in maize fields
Sorghum halepense, or Johnsongrass, is without doubt the most damaging.
Because the quantity limits are very large and inaccurate information at this
point, it is necessary a better approaching of this species.Because various
morphological differences on fields in different country areas, an complex
morphological studies was conducted, in order to search the variation limits
for some morphological characters of Johnson grass (plant height, number of
internodes, length of the last internod, number of branches, the length of the
last leaf, etc).The Sorghum helepense samples were harvested from
Timişoara, Voiteg, Jebel, Gătaia, Lugoj, Buziaş, Lovrin, Grabaţ, Gotlob,
Dudeştii Vechi, Jimbolia, Sînnicolau Mare, Cărpiniş, Becicherecul Mic,
Şandra şi Biled. From each locality were harvested 30 samples. The
morphological characters analyze was conducted trough biometrical
measurements with help of a rule when the plants were on fully grown. The
results were statistical evaluated and correlations were made between the
studied characters related to climatic conditions of studied areas. An ample
variability was observed on plants height (133.80±3.23 -184.81±1.47),
number of brethren (1.67 ± 0.19 - 6.93±0.54), internodes number (6.27 ±
0.14 - 8.13±0.19), the last internod length (37.26 ± 1.45 - 55.88±1.07),
panicle length (24.41±0.45 - 33.46±0.60), number of branches (24.53±1.24 -
45.17±1.32).
