Studii privind caracterele de productivitate la specia Sorghum halepense L. (Pers.) în vestul ţării

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).