Performance of soybean plants as function of seed size: II. Nutritional stress

• Published in: Journal of seed science Vol. 35; no. 4; pp. 419 - 427
• Main Authors: Marcos Morais Soares, Glauter Lima Oliveira, Paulo Emídio Soriano, Marcelo Coelho Sekita, Tuneo Sediyama
• Format: Journal Article
• Language: English
• Published: Associação Brasileira de Tecnologia de Sementes
• Subjects: diâmetro de crivo; fósforo; glycine max; vigor
• ISSN: 2317-1537; 2317-1545

The high quality seed is an input with invaluable for obtaining soybean crops with higher yields; for it reflects the results of high investments in research of modern technologies, which will be converted into high productivity levels. Thus, the aim of this study was assessing performance of soybean seeds, sorted by size, and grown in soils with different phosphorus levels. To this, seeds of two soybean cultivars (MSoy 9144RR and MSoy 8527RR) were sorted with aid of circular screens with perforations of 5.5 mm and 7.5 mm in diameter. Sowing was carried out into plastic pots, with 3.0 dm³ substrate capacity each, containing a Red-Yellow Oxisol, fertilized with increasing phosphorus dosages (50, 100, 200, 300 and 400 mg. Kg-1), and performed under greenhouse environmental conditions. Seed size did not significantly influence the values obtained to the variables analyzed; however, to the larger seeds there was a trend of increase on these values. There was also a trend of increase on these values to all variables assessed when the dosages of phosphorus in the soil were increased.