Effect of potassium fertilization on agronomic, functional and antinutritional characteristics in vegetable soybeans
2012
Oliveira, S.F de | Castoldi, R. | Braz, L.T. | Charlo, H.C.O. | Carrao-Panizzi, M.C.
The production and quality of soybeans depend on proper fertilization and utilization of nutrients and adequate doses, among other factors, favoring the accumulation of elements essential for the production of dry matter and of functional nutrients. Therefore, the aim of the present study was to evaluate the response of vegetable soybeans with respect to agronomic, functional and anti-nutritional characteristics, using different doses of potassium. The experiment was conducted in the field, at UNESP-FCAV in Jaboticabal-SP. A randomized block design was adopted with five doses of potassium, and five repetitions. The genotype used for study was JLM019. The doses of potassium were calculated in accordance with soil analysis, which were: 0, 50, 100, 150 and 200% of that recommended. Seeding was carried out on 13 January 2009, directly in the field. Harvesting was on 28 April 2009, when the vines were in the reproductive stage R6. Plant height, height of insertion of first vine, mean number of vines per plant, fresh weight of vines per plant; length of vines, mean number of seeds per vine, fresh weight of 100 seeds, total estimated productivity of immature seeds (kg/ha), and levels of moisture content, proteins, lipids, ash, carbohydrates, isoflavones and Kunitz soybean trypsin inhibitor (KSTI) were measured. For all these variables, there was no significant difference, except for the number of seeds per vine and carbohydrates. The results showed that a 50 to 100% increase in recommended dose is viable, since the increase in cost of production is small in view of the 25% increase in production.
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