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- Title
Effects of Eupatorium adenophorum on growth of peanut and its economic threshold.
- Authors
ZHU Wen - da; YAN Dong - dong; CAO Ao - cheng; LI Lin; LIU Xiao - yan
- Abstract
To determine economic infestation level and economic threshold of Eupatorium adenophorum in pea-nut fields, additive series experiment and curve fit were adopted to study the changes of yield characteristics of pea-nut under different density of E. adenophorum in the fields. The results showed that with the interference of E. ade-nophorum, the peanut pods per plant, 100 - kernel weight and peanut kernel yield decreased gradually with the in-creasing weed density. The yield loss of peanut could be due to the decrease of peanut pods per plant and 100 -kernel weight. Moreover, the interference of light penetration rate and accumulation of nutrient and water in E. ade-nophorum may also cause yield loss of peanut. The power regression model (y = 1. 712x1. 063, P <0. 000 1 ) was rel-atively better in describing the relationship between E. adenophorum density (x) and yield loss (y) of peanut. The economic infestation levels for the E. adenophorum by manual weeding, glyphosate and picloram were 6. 06%, 0.57% and 0.77% respectively, and the economic thresholds were about 3.28, 0.36, and 0.46 plant m-2 re-spectively.
- Subjects
PEANUT yields; EUPATORIUM; GLYPHOSATE; BIOACCUMULATION in plants; REGRESSION analysis
- Publication
Chinese Journal of Oil Crop Sciences, 2012, Vol 34, Issue 5, p518
- ISSN
1007-9084
- Publication type
Article