Evaluating the competitive ability of faba bean-mahta variety in different density of black bindweed (Polygonum convolvulus)
Subject Areas : Weed Research JournalMarieh Shaki 1 , Asieh Siahmarguee 2 , Farshid Ghaderifar 3 , Ebrahim Zeinali 4 , Fatemeh Sheikh 5
1 - Gorgan University of Agricultural Sciences and Natural resources
2 - Agronomy department,Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
3 - Gorgan University of Agricultural Sciences and Natural resources
4 - Department of Agronomy, Faculty of Crop Protection, Gorgan University of Agricultural Sciences and Natural Recourse.
5 - Golestan Agricultural and Natural Resources Research and Education Center
Keywords: cousense model, economic damage threshold, interference, leaf weight distribution,
Abstract :
In order to investigate the competitive power of faba variety Mahta in the condition of interference with black bindweed) Polygonum convolvulus( an experiment was conducted in the form of randomized complete block design with three replications in the research farm of Gorgan University of Agricultural Sciences and Natural Resources in the crop year of 1400-1401. The investigated treatments were different densities of black bindweed at the levels of zero, 5, 10, 15, 20, 30 and 45 plants.m-2. The changes and distribution of leaf dry weight in different layers of bean canopy during the flowering stage were also determined. The results indicated that, with the increase in weed density, faba bean seed yield decreased in a non-linear manner. According to the output of the Cousense model, the yield of dry faba bean seeds will decrease by 3.71% for the arrival of the first weed plant. Also, the maximum damage caused by this weed in high densities will reach 71.71%, which is a significant number. The study of changes in leaf dry weight in different layers of the canopy indicated that in the control treatments and interference with three weed plants, the majority of the leaf surface was concentrated in the 60-90 cm layer; But in the conditions of interference with higher densities of thorny weed, broad bean tried to concentrate its leaves in the higher layer of its canopy (more than 90 cm). In this study, the economic threshold index of damage for green pod yield and dry grain yield was calculated as 0.511 and 0.774 plants per square meter, respectively. This result shows the high damage of black bindweed on faba bean (Mahta) yield and its significant sensitivity to black bindweed. Due to the fact that increasing the planting area of the Mahta bean with the aim of using it in poultry feed is one of the promising programs of the country in order to reduce the import of poultry feed, it is necessary to design a formal program for the management of this weed.
