Effect of plant density on growth and yield of new soybean genotypes grown under early planting condition in southwestern Japan

Abstract

Soybeans planted in early to mid-June (early) are less affected by rainfall during rainy season than those conventionally planted in early to mid-July in southwestern Japan. Also, narrow row cultivation is expected to increase soybean yield and save labor for inter-tillage and ridging. Field experiments were performed in 2014 and 2015 to test the effect of plant density (high, middle, and low) under early planting condition on growth, yield, and several agronomical traits of Sachiyutaka A1 and three new genotypes (Sakukei 155, Kanto 127 and Shikoku 15). Early planting was performed in mid-to late June, even though rainy season started in early June. Higher plant densities produced 13% greater yield than low plant density through an increase in biomass accumulation, especially at R5. Among yield components, only pods m −2 was significantly and positively correlated with yield, indicating that an increase in pods m −2 led to a greater yield with higher plant densities. The yields of Sachiyutaka A1 were relatively stable for two years, but the lodging resistance should be further improved. Shikoku 15 had greater yield potential and lodging resistance, but its resistance to damping-off disease should be improved. Sakukei 155 with medium plant density produced relatively high and stable yield with less lodging. Although the yield of Kanto 127 fluctuated between experimental years, this genotype showed higher yield potential in higher plant densities with less lodging in 2015. Thus, Sakukei 155 and Kanto 127 with high or medium density may be suitable for early planting in this region.

Soybean Seed Yield Response to Plant Density by Yield Environment in North America

“…Models were fitted using hierarchical Bayesian models. conducted under varied environments in the United States (Ball et al, 2000;Heatherly and Elmore, 2004;Lee et al, 2008, De Bruin and Pedersen, 2009, Epler and Staggenborg, 2008Walker et al, 2010;Gaspar and Conley, 2015), Brazil (de Luca et al, 2014), and Japan (Agudamu and Shiraiwa, 2016;Matsuo et al, 2018) also reported different values of AOPDs that were within the range of AOPDs observed in the current study, ranging from 238,000 to 313,000 plants ha -1 . A recent study hypothesized that low plant establishment and survival in a LYE could be one of the potential factors affecting the differential yield response to seeding rate between YEs (Corassa et al, 2018).…”

Economically Optimal Plant Density for Machine-harvested Edamame

“…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 grain-type soybean report that plant density influences plant height (Matsuo et al, 2018;Mehmet, 2008), number of main stem branches (Agudamu and Shiraiwa, 2016;Board and Kahlon, 2013), and plant biomass (Matsuo et al, 2018). Companies selling edamame seed identify seeding rates ranging from 197,600 plants/ha (Wannamaker Seeds, Saluda, NC) to 344,200 plants/ha (Johnny's Selected Seeds, Winslow, ME), which is similar to recommendations for grain-type soybean (Nafziger, 2009).…”

Impact of Plant Spacing and Weed Control Treatments on Yield, Quality of Soybean (Glycine Max L.) and Associated Weeds Characters under Middle Egypt Conditions

“…As shown in Seadh and Abido (2013), Hassan (2015), Asmaa et al (2017), Gulluoglu et al (2016 and, Andres et al (2018) and Matsuo et al (2018).…”

“…This includes management of soybean plant spacing and densities, which is one of the important agronomic practices influencing crop growth and productivity (Caliskan et al, 2007;El-Far et al, 2016;Asmaa et al, 2017;Gulluoglu et al, 2017 andMatsuo et al, 2018). Plant density plays an important role in the competitive balance between weeds and soybean.…”