摘要
本文用生态经济观点研究了夏花生与马唐的竞争关系,建立了夏花生田马唐的生态经济阈值模型:C×100×100/PVE+F×100/PV=(?)和生态经济除草阈值模型:可为经济除草、维持生态平衡提供科学依据。
Field plot and investigation experiments were conducted in Beijingregion in 1985—1986 to study the competitive relationships between theAscendent Crabgrass (Digitaria adscendent (H.B.K.)) and summergroundnut from the eco-economic threshold model and eco-economiccontrol threshold model were given by means of simulation with computerand statistical analysis.The main results are as follows: 1. No matter how high density of the Ascendent Crabgrass was andhow vigorous the weeds within 15 days after crop emergence in summergroundnut the Crabgrass did not affect on crop yield. 2. Crabgrass'eco-economic threshold in groundnut field was prop-osed as follows:(1) at the yield level of 100 Kg/mu when using her-bicide Nabu and the density of Crabgrass was less than 60 plants/M^2 weshould control them One month after emergence of groundnut.(2) at theyield level of 250kg/mu when hand weeding,the density of Crabgrasswas less than 30 plants/M^2,control should be conducted One month affteremergence;if the density of Crabgrass was more than 30 plants/M^2control should be made 15—30 days after emergence. 3. The eco-economic control threshold of Crabgrass in the summergroundnut field was at least 2gm/m (absolute height (m) × weight(g/m)of the weed).
出处
《植物保护学报》
CAS
CSCD
北大核心
1989年第2期139-143,共5页
Journal of Plant Protection
关键词
夏花生
生态经济
杂草
除草
阀值
summer groundnut
crabgrass
eco-economic threshold
eco-economic control threshold
