Details
| Original language | English |
|---|---|
| Pages (from-to) | 111-128 |
| Number of pages | 18 |
| Journal | Weed research |
| Volume | 41 |
| Issue number | 2 |
| Publication status | Published - 21 Dec 2001 |
Abstract
A model was developed to quantify the canopy development of Chenopodium album L. in response to crowding. In field experiments, C. album was planted at two densities in pure and mixed stands with either cauliflower (Brassica oleracea L. convar, botrytis var. botrytis) or faba beans (Vicia faba L.), yielding data on plant height, maximum diameter and leaf area. Plant heights of C. album differed significantly between pure stands and mixed plots with an early cauliflower crop. Effects in a summer cauliflower planting were not as marked. Faba beans suppressed C. album, which was unable to overgrow the crop. Assumed to be mainly responsible for plant height modulation due to crowding, the leaf area index around elongating internodes was estimated. In the model, this estimate was related to the stem elongation rate yielding an accurate prediction of potential plant height growth. Because this potential was not realized under low light conditions, a feedback of assimilate shortage on height growth was introduced. Plant diameter was adequately simulated when based on plant density. As the vertical leaf area distribution did not change, it is concluded that leaf area of C. album can be predicted at every point in time and space from a given total leaf area and plant density. This information is useful in models of light competition to improve the description of weed competition effects.
Keywords
- Crop:weed competition, Crowding, Modelling, Plant height
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Ecology, Evolution, Behavior and Systematics
- Agricultural and Biological Sciences(all)
- Agronomy and Crop Science
- Agricultural and Biological Sciences(all)
- Plant Science
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In: Weed research, Vol. 41, No. 2, 21.12.2001, p. 111-128.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Canopy development of Chenopodium album in pure and mixed stands
AU - Röhrig, M.
AU - Stützel, H.
PY - 2001/12/21
Y1 - 2001/12/21
N2 - A model was developed to quantify the canopy development of Chenopodium album L. in response to crowding. In field experiments, C. album was planted at two densities in pure and mixed stands with either cauliflower (Brassica oleracea L. convar, botrytis var. botrytis) or faba beans (Vicia faba L.), yielding data on plant height, maximum diameter and leaf area. Plant heights of C. album differed significantly between pure stands and mixed plots with an early cauliflower crop. Effects in a summer cauliflower planting were not as marked. Faba beans suppressed C. album, which was unable to overgrow the crop. Assumed to be mainly responsible for plant height modulation due to crowding, the leaf area index around elongating internodes was estimated. In the model, this estimate was related to the stem elongation rate yielding an accurate prediction of potential plant height growth. Because this potential was not realized under low light conditions, a feedback of assimilate shortage on height growth was introduced. Plant diameter was adequately simulated when based on plant density. As the vertical leaf area distribution did not change, it is concluded that leaf area of C. album can be predicted at every point in time and space from a given total leaf area and plant density. This information is useful in models of light competition to improve the description of weed competition effects.
AB - A model was developed to quantify the canopy development of Chenopodium album L. in response to crowding. In field experiments, C. album was planted at two densities in pure and mixed stands with either cauliflower (Brassica oleracea L. convar, botrytis var. botrytis) or faba beans (Vicia faba L.), yielding data on plant height, maximum diameter and leaf area. Plant heights of C. album differed significantly between pure stands and mixed plots with an early cauliflower crop. Effects in a summer cauliflower planting were not as marked. Faba beans suppressed C. album, which was unable to overgrow the crop. Assumed to be mainly responsible for plant height modulation due to crowding, the leaf area index around elongating internodes was estimated. In the model, this estimate was related to the stem elongation rate yielding an accurate prediction of potential plant height growth. Because this potential was not realized under low light conditions, a feedback of assimilate shortage on height growth was introduced. Plant diameter was adequately simulated when based on plant density. As the vertical leaf area distribution did not change, it is concluded that leaf area of C. album can be predicted at every point in time and space from a given total leaf area and plant density. This information is useful in models of light competition to improve the description of weed competition effects.
KW - Crop:weed competition
KW - Crowding
KW - Modelling
KW - Plant height
UR - http://www.scopus.com/inward/record.url?scp=0035023525&partnerID=8YFLogxK
U2 - 10.1046/j.1365-3180.2001.00221.x
DO - 10.1046/j.1365-3180.2001.00221.x
M3 - Article
AN - SCOPUS:0035023525
VL - 41
SP - 111
EP - 128
JO - Weed research
JF - Weed research
SN - 0043-1737
IS - 2
ER -