| Author(s) | *Khalid. F Al Mutlaq and Robert L.Zimdahl |
| Affiliation | *Department of Plant Protection, King Saud University, P.O.Box 2460, Riyadh 11451, Saudi Arabia, and Department of Bioagricultural Science and Pest Management, Colorado State University, Fort Collins, CO 80523, USA |
| Title | Growth Analysis of Weed Seedlings |
| Source | Journal of King Saud University. Agricultural Sciences. Volume 15, No 1. (2003/1423) |
| Abstract | Abstract. Experiment to determine growth of seedlings of eight annual weeds was conducted. The objective was to determine the pattern of growth and the end of the seedling stage for each weed. Analysis included length and area of roots and stems, leaf number, total leaf area, and dry weight over time. The experiment was conducted twice in the greenhouse and twice in the field. Growth pattern of all weed component was exponential except root elongation of redroot pigweed, kochia, and black nightshade that was linear in greenhouse experiments. Shoot dry weight was the best indicator of the growth pattern of weed seedlings. Two phase linear regression was used to detect differences in shoot dry weight over time. The seedling stage ended and the juvenile stage began when the rate of change in shoot dry weight increased after emergence. Nomenclature: wild oat, Avena fatua L. AVEFA; wild proso millet, Panicum miliceum L. PANMI; barnyardgrass, Echinochloa crus-galli L. ECHCG; green foxtail, Setaria viridis L. SETVI; velvetleaf, Abutilon theophrasti Medicus. ABUTH; kochia, Kochia scoparia L. KCHSC; black nightshade, Solanum nigrum L. SOLNI; redroot pigweed, Amaranthus retroflexus L. AMARE. Additional index words: Growth pattern, growth rate, shoot/root ratio, juvenile, two-phase regression. |
