MICRONUTRIENT COMPOSITION OF LENTILS UNDER DIFFERENT FERTILIZATION REGIMES
Abstract
The article presents data on the accumulation of micronutrients in the seeds and straw of lentils depending on fertilization on podzolized chernozem of the Right-Bank Forest Steppe of Ukraine. It was established that lentil straw, compared to seeds, contains higher amounts of iron, manganese, copper, boron, and cobalt. Under improved nitrogen nutrition of plants and inoculation with nodule bacteria, higher accumulation of manganese, zinc, and molybdenum in lentil seeds was observed, whereas improved phosphorus nutrition reduced the content of iron, copper, and zinc. Increased potassium nutrition decreased the content of iron, manganese, boron, and molybdenum in lentil plants. The iron content in lentil seeds ranged from 40.3 to 45.7 mg/kg of dry matter, depending on the experimental variant. Changes were minor, which can be explained by genetic stability mechanisms of the plant organism and biological dilution associated with increased biomass yield. In the conducted experiment, lentil seeds contained low levels (11.1–13.3 mg/kg) of manganese, indicating that plants may respond to additional manganese fertilization. According to research data, the zinc content in lentil seeds was 39.2–46.2 mg/kg of dry matter, which is relatively high for legumes. With increasing yield, its concentration decreased, which can be explained by biological dilution. The copper content in lentil seeds ranged from 8.76 to 10.35 mg/kg of dry matter, which is optimal (1–15 mg/kg) for grain legumes. The molybdenum content in lentil seeds from unfertilized plots was 0.14–0.16 mg/kg of dry matter. The application of nitrogen and phosphorus fertilizers increased up to 0.31 mg/kg, depending on the experimental variant. The application of ammonium molybdate contributed to increasing its content in lentil seeds to 3.88–4.25 mg/kg of dry matter, depending on the experimental variant. In the conducted experiment, the cobalt content in lentil seeds was quite low–from the minimum detectable limit of the instrument to 0.017 mg/kg. This indicates the potential high efficiency of applying cobalt fertilizers to lentils.
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