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

Abstract

Methodologies of competitive interaction quantification between crops are not widely investigated. Therefore, field experiments (using addition series) were conducted in 2005 and 2006, to quantify interspecific and intraspecific competition coefficients and, also, the relative competitive ability (RC) of potato (Solanum tuberosum) and common bean (Phaseolus vulgaris). The relations between potato tuber yield/plant and common bean density at various densities of potato and also with potato density at different densities of common bean are well described by the reciprocal equations. Potato tuber yield/unit area decreased as common bean density increased. Optimum potato densities on the basis of maximum potato tuber yield/unit area at 0, 20, 30, and 40 plants/m 2 of common bean were obtained at 14, 13, 12, and 12 plants/m 2 , as estimated by the parabolic relations between potato tuber yield/ unit area and potato densities at different common bean densities. Potato was a stronger competitor than common bean, as a potato plant was equal to 6.22 common bean plants, based on potato tuber yield. A common bean plant, also, was equivalent to 0.0475 of a potato plant, on the basis of common bean grain yield. Therefore, potato was more aggressive than common bean, indicating that potato tuber yield was mostly affected by intraspecific competition, whereas common bean grain yield was mostly affected by interspecific competition. Niche differentiation index (NDI) was smaller than 1, showing severe competition of two species for environmental H08057; resources. It was concluded that yield-density relations in intercropping could be well quantified by application of the proposed equations.

Optimization of Nitrogen Rate and Planting Density for Improving Yield, Nitrogen Use Efficiency, and Lodging Resistance in Oilseed Rape

“…Direct drill planting and mechanized harvesting has enabled farmers to gain higher yield of rapeseed from attaining higher plant densities (Hu et al, 2016 ). Although previous studies reported that after a saturation threshold, yield per unit area does not increase with plant density because of high intra specific competition for resources (Raey and Ghassemi-Golezani, 2009 ). Al-Barzinjy et al ( 1999 ) showed that dry biomass per plant, seed weight per plant and number of pods per plant decrease with increasing plant density, whereas seed yield m −2 peaks at 50 plants m −2 and decreases at higher densities, following a parabolic curve relationship.…”

Transcriptome profiling revealed diverse gene expression patterns in poplar (Populus × euramericana) under different planting densities

“…Light is a key environmental factor and an important consideration for agroforestry production [10,11]. Under high planting density, plants increase light capture by expanding their canopy to elevate yield [12]. Studies have also shown that with increasing density, light transmittance to each layer decreases significantly, ultimately affecting yield [13].…”

Alteration in yield and oil quality traits of winter rapeseed by lodging at different planting density and nitrogen rates

“…Plant density affects yield and the extent of lodging by altering the crop canopy 12 . High plant densities enhance light capture by the canopy and increase yield up to a certain saturation threshold 13 . At high plant densities, the canopy is uniform, stems are thinner, branches are shorter, and maturation is more synchronized, all of which are factors that facilitate mechanized harvesting and decrease yield losses 14 , 15 .…”