Interference and economic threshold of horse purslane (Trianthema portulacastrum) in soybean cultivation in northern India

Abstract

Soybean is the most important oilseed crop that is grown in India. Horse purslane (Trianthema portulacastrum L.) infests soybean heavily, causing enormous yield losses and threatening the sustainability of the soybean production system. Information on the interference and economic threshold of horse purslane will be useful for the effective management of horse purslane in soybean. This will lead to the rationalization of herbicide use and the reduction of herbicide input into the environment. It was observed in this study that "a composite stand of weeds including horse purslane", and 200 horse purslane plants per m 2 were equally competitive to soybean.These two treatments resulted in a higher dry weight, growth rate, and uptake of N, P, and K by the weeds and/or horse purslane, compared to the other treatments.They caused more reductions in soybean growth (dry weight, height, crop growth rate, net assimilation rate, and leaf area index) and resulted in a more significant yield reduction than did the other treatments. The weed density-crop yield and the relative leaf area-crop yield models were found to be equally effective in simulating soybean yield losses in relation to a wide range of horse purslane densities and the regression equations were a good fit.The quadratic equations revealed that a density of approximately six, five, and four horse purslane plants per m 2 would be the economic threshold levels of horse purslane in soybean cultivation, when considering the 70, 80, and 90% horse purslane control efficiencies, respectively, of the herbicide, lactofen.

Morning glory species interference on the development and yield of soybeans

“…For example, soybean yield infested with Cyperus rotundus (0-200 pl•m -2 ) was decreased by 47% (Das et al 2014), while soybean yield loss can reach 21% due infestation with Trianthema portulacastrum (0-200 pl•m -2 ) (Hazra et al 2011). Bidens spp.…”

Exploration of a Hyphomycetes Fungus for Biological Control of Horse Purslane Weed in India

“…Balyan and Malik (1989) reported that horse purslane is a strong competitor, reducing the yield of mung bean by 50 to 60% when left untreated. Significant losses in maize, soybean and peanut yield are also attributed to this weed (Grichar, 1993 and2008;Hazra et al, 2011;Saeed et al, 2010). Allelopathic growth inhibition of crop plants from horse purslane infestation has also been reported (Sethi and Mohnot 1988).…”

Effect of ecological factors on germination of horse purslane (Trianthema portulacastrum)

“…It is a weed of cultivated fields and waste lands. It grows luxuriantly if water is available and it is especially problematic in maize, cotton, potato, sugarcane, pulses, fodders and vegetables, particularly during rainy season (Hazra et al, 2011). Its prostrate growth and profuse branching capacity helps it to quickly cover the soil surface and form a green carpet (Senthil et al, 2009).…”