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Daljeet S. Dhaliwal and Martin M. Williams II

called simply “plant density.” Selecting the appropriate plant density is an important crop management decision in commercial edamame production where plant architecture determines efficiency of mechanical harvest ( Zandonadi et al., 2010 ). Studies on

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Gilles Saindon, Henry C. Huang, and Gerry C. Kozub

The putative yield advantage associated with growing upright beans (Phaseohs vulgaris L.) at high planting densities in narrow (0.23-m) rows might he compromised by a higher risk of white mold [Sclerotinia sclerotiorum (Lib.) de Bary] because of reduced air flow through the crop canopy. This four-yeai-study was undertaken to compare the white-mold avoidance and agronomic attributes of upright bean lines and to determine whether their yields can he increased by raising planting density. Four upright lines and a viny line as a control were established in narrow rows at planting densities ranging from 25 to 60 plants/m* in a field artificially infested with sclerotia of S. sclerotiorum. On average, the four upright lines had lower incidence of white mold and smaller disease severity indices than the control, `UI36', indicating that the development of white mold is reduced in dense, erect canopies. There were differences in disease response among the upright lines, with `ISB82865' and `UI906' being the least and most susceptible entries, respectively. Increases in planting densities resulted in higher yields and influenced the development of white mold hut had no effect on vine length, lodging, and maturity. However, the planting density effect on the disease response was not consistent among entries in 2 of the 4 years. The results of this study indicate that upright beans can he grown at high planting densities without greatly increasing the risk of a white-mold outbreak. The choice of the most appropriate planting density for upright beans depends largely on the cost of seed.

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Martin M. Williams II

changed little over the last 80 years in the United States despite 6-fold yield gains ( Egli, 2015 ). The sink limitation has been largely overcome in grain corn by improving plant density tolerance (also known as crowding stress tolerance) and planting

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S. Alan Walters

; Schultheis et al., 2007 ; Strang et al., 2004 ), little has been done to determine the optimum spacing for mini triploid watermelon to obtain the highest percentages of marketable fruit (packout) in the 3- to 8-lb range. Increasing watermelon plant densities

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Juan C. Rodriguez, Nicole L. Shaw, and Daniel J. Cantliffe

field experiments conducted in north–central Florida, planting densities of 1.0, 2.0, and 3.0 plants/m 2 of Galia-type muskmelons did not affect fruit yield ( Paris et al., 1988 ). Soluble solids content (SSC) of muskmelon grown at higher densities has

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Ravneet K. Sandhu, Nathan S. Boyd, Lincoln Zotarelli, Shinsuke Agehara, and Natalia Peres

affect the vegetative growth and yield of crops grown as a monocrop or an intercrop. The selection of the optimum plant density or spacing ensures optimal crop yield can be achieved ( Fortin et al., 1994 ; Gebru, 2015 ). Competition can be among plants

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Jennifer Wetzel and Alexandra Stone

influenced by planting density. Specific planting density recommendations from the United States cover a broad category of crops, including pumpkins and winter squash. For example, the National Center for Appropriate Technology sustainable agriculture program

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Ramon G. Leon and Delanie Kellon

growers to have a greater technical understanding of the crop to ensure success. Unfortunately, there is limited information about ‘MD-2’ growing requirements in the literature. Planting density and fertilization are among the production factors that have

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Brian Ward, Powell Smith, Susan James, Zachary Stansell, and Mark Farnham

contrary, Californian growers plant up to 172,000 plants/ha and yield up to 20,000 kg·ha −1 . There are a limited number of earlier research trials examining the effects of variable broccoli plant densities on head production, and those that are available

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Anke van der Ploeg, Susana M.P. Carvalho, and Ep Heuvelink

at suboptimal temperatures, another strategy is to breed for heavier plants at a suboptimal temperature regime ( Van der Ploeg et al., 2007a ). This would allow a higher planting density at lower temperatures, thus making up for the increase in