Interference between shatter cane (Sorghum bicolor) and soybean (Glycine max)

Abstract

A field study was conducted to evaluate the effects of shatter cane (Sorghum bicolor) and soybean (Glycine max) densities on soybean seed yield and to quantify interspecific and intraspecific interference coefficients. The relations between soybean seed yield per plant and shatter cane density at different densities of soybean and also with soybean density at different densities of shatter cane are well described by the reciprocal equations. Soybean seed yield per unit area decreased with increasing shatter cane density. The highest yield loss (57%) was relative to 50 and 12 plants/m 2 of soybean and shatter cane densities, respectively. Optimum soybean densities on the basis of maximum soybean seed yield per unit area at 0,4, 8, and 12 plants/m 2 of shatter cane were achieved at 50, 34, 32, and 36 plants/m 2 , as estimated by the asymptotic or parabolic relations between soybean seed yield per unit area and soybean densities at different shatter cane densities. Shatter cane was a stronger competitor than soybean, as a shatter cane plant was equal to 2.5 soybean plants, based on soybean seed yield. In contrast, a soybean plant was equal to 0.18 of a H03096;

Yield‐density relationship for potato (Solarium tuberosum) and common bean (Phaseolus vulgaris) in intercropping

“…2, 4). Similar results are reported by Raey et al (2005), describing interference between soybean and shatter cane. increasing common bean density decreased potato tuber yield per unit area at various densities of potato.…”

“…Reciprocal equations (Raey et al 2005) were used to describe the intraspecific and interspecific competition relationships for potato and common bean on a per plant basis:…”

“…2). The improved yield/density equations (Raey et al 2005) were applied to describe relations between potato density and potato tuber yield/unit area at various densities of common bean (Tables 3 and 4). The relationship between reciprocal of potato tuber yield/plant and potato density was asymptotic ( Fig.…”

“…These coefficients can be used to calculate the relative competitive abilities of each species being studied (Roush & Radosevich 1985;Oliver & Buchanan 1986;Roush et al 1989). Raey et al (2005) improved these equations to quantify the relationship of soybean grain yield with different densities of soybean and shatter cane. a similar approach could be applied to investigate other important intercropping such as common bean (Phaseolus vulgaris) with potato (Solanum tuberosum), to improve the validity of these models.…”

“…So, intercropping could be applied to make simultaneous production of these two major plants (non-legume and legume) possible. Thus, the objectives of this research were to: (1) test the equations introduced by Raey et al (2005) to describe the relationship between potato tuber yield and common bean density; (2) estimate optimum densities of potato at different densities of common bean; and (3) evaluate the effect of common bean density on potato tuber yield, when grown simultaneously in competition with potato.…”