Genetic parameters estimate and characters analysis in phenotypic phase of soybean during two evaluation periods

Self Cite

The objective was to evaluate the epicotyl length of seedlings of soybean cultivars in the field, submitted to plant densification by reducing the inter-row spacing. Two field experiments were conducted in Rio Paranaíba in the state of Minas Gerais and the effect of reduced spacing (20 cm, 30 cm, 40 cm and 50 cm between rows) was evaluated. The assessment of the epicotyl length was done by using a millimeter ruler when the plants reached the V2 development stage. The experiments were conducted in a randomized block design with four repetitions. In experiment 1, the BRSMG752S cultivar was submitted to four inter-row spacings and no differences were found among them. In experiment 2, the simple factorial scheme 4 x 3 was considered, with 4 spacings and 3 cultivars, to analyze the effect of the interaction between cultivars (96R10, 97R50 and 98Y21) and spacing (20, 30, 40 and 50 cm between rows). The results of experiment 2 indicated that there was no significant effect for spacing and that the cultivars presented statistically different averages. Thus, it can be concluded that the epicotyl length of soybean seedlings, grown in the field in Rio Paranaíba in the state of Minas Gerais and evaluated at the V2 stage of development, was not influenced by the distance between the sowing lines and that the cultivar 96R10 showed the highest and 98Y21 the lowest mean epicotyl length of soybean seedlings, grown in the field in Rio Paranaíba in the state of Minas Gerais and evaluated at the V2 stage of development.

Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Epicotyl length in seedlings of soybean cultivars subjected to reduced inter-row spacing

Gontijo¹,

Sousa

Matsuo

et al. 2021

Self Cite

“…Soybean is one of the main crops of agriculture, with a relevant socioeconomic role, with Brazil being the second largest world producer of oilseeds. In the 2018/2019 harvest, the crop occupied an area of 35.8 million hectares in the country, with a 1.9% increase in planted area compared to the previous harvest, with an estimated production of 114.4 million tons of grains (Companhia Nacional de Abastecimento [CONAB], 2019;Hanyu, Costa, Cecon, & Matsuo, 2020;Soares, Sediyama, & Matsuo, 2020;Ferreira et al, 2020;Frota et al, 2020;Carvalho et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Relative maturity group and its relationships with the non preferential sowing season of soybean

Bubans

Carvalho

Ceolin

et al. 2021

The cultivation of soybeans is the main agricultural commodity in Brazil, the increase in the cultivated area in recent years and the productivity of grains is interconnected with numerous factors such as sowing time, water availability, temperature and photoperiod. The objective of this work was to evaluate the duration of phenological sub-periods and the productivity of soybean cultivars from different groups of relative maturation, sown in two seasons in the off-season in the northwest region of the State of Rio Grande do Sul (RS). The experiment was carried out at Agropecuária Bubans geographically located in the county of Ijuí in the state of RS, considered medium locality. The experiment was carried out using a randomized block design with four replications, the experimental units consisted of four lines, four meters long, 0.50 m apart. The treatments were eight soybean cultivars with different groups of relative maturity (4.8, 5.8, 5.9, 6.2, 6.3, 6.4, 6.7 and 7.8) sown on January 5 and 22, 2019 (from agricultural zoning, the preferred season for sowing in this region is from october to december), constituting an 8 x 2 factorial experiment (Cultivars x sowing times). Assessments of the duration of phenological sub-periods and of the yield components of the culture were carried out, being measured with total plant height, first pod insertion height, number of lateral branches, number of reproductive nodes on the main stem, total number of nodes on the main stem, number of pods with one, two, three and four grains, pods mass of one, two, three and four grains, total grain mass per plant, thousand seed mass and grain yield. The most productive relative maturity group is 6.3 being sown in the first non-preferential season for soybeans in Rio Grande do Sul. The second sowing time changed the dynamics of association of the measured variables, with changes in the cycle, reductions in the vegetative and reproductive period.

“…Soybean is the crop with main grain exportation in Brazil. The 2017/2018 crop season revealed a production of 118 million tons of grains and a cultivated area of 35 million hectares (Matsumoto et al, 2017Companhia Nacional de Abastecimento [CONAB], 2018Frota et al, 2020;Ferreira et al, 2020;Hanyu, Costa, Cecon, & Matsuo, 2020;Soares, Sediyama, & Matsuo, 2020), being surpassed only by United States. The evolution of production and yield of soybean is linked to the insertion of RR event (Roundup Ready) being destined to the control of weeds in no-till sowing system (Nepomuceno, Varela, Alves, & Martins, 2012).…”

Section: Introductionmentioning

confidence: 99%

Nodulation and agronomic performance of soybean grown in different seeding periods and glyphosate formulations

Escalera

Carvalho

Pimentel

et al. 2021

The aimed to evaluate the influence of different glyphosate formulations in nodulation, agronomic performance and RR soybean seeds yield, grown in two sowing periods. The experimental design was the casualized blocks with treats disposed in four replicates, being organized in factorial scheme, two seeding periods x five glyphosate formulations. The measured characters were number of nodules per plant, number of active nodules, number of inactive nodules, height of the first legume insertion, plant height, number of legumes per plant, number of seeds per plant, mass of thousand seeds and yield of seeds per plant. The isopropylamine salt influences nodular activity, number of vegetables and seeds per plant, as well as seed yield. The sowing of soybeans at the recommended time propitiates smaller modifications face to glyphosate formulations. mulations.