Influence of the factors rate and form of nitrogen fertilization on the accumulation of nitrates in radishes
Plamena Yankova
, Hriska Boteva
Abstract: The experiment was carried out in the period 2021-2023 on Calcic Chernozem soil, in the experimental field of the Department of Crop production of the Technical University of Varna. The study was carried out with radish, variety Celeste F1. Four levels of nitrogen fertilisation were tested with 3, 6, 9 and 12 kg N/da in different forms of nitrogen - ammonium sulphate, ammonium nitrate, urea, potassium nitrate, calcium nitrate, sodium nitrate, applied once during soil preparation before sowing, in four repetitions with a reporting area - 4 m2. The seeds were sown in two periods: in spring - 10 - 12 April, and in autumn - 10 - 12 September, with a vegetation period of 30 - 35 days.
It was found that the nitrate content of the root vegetables increased as the rate of nitrogen fertilisation increased. In spring radish, the highest nitrate content was observed after fertilisation with 12 kg N/da as sodium nitrate (1700 mg) and with calcium nitrate - 1650 mg/kg fresh weight. The nitrate content of the root crops increased by 3.8 and 3.6 times, respectively, compared to the control. In the autumn radish variety Selesta F1, the nitrate content was higher, which can be explained by the less favourable conditions for urea hydrolysis and also for nitrification of ammonium nitrogen, by the lower plant light due to the shorter day and the greater number of cloudy days, and by the lower soil and air temperature. The two-factor analysis of variance shows that the form of nitrogen has a stronger influence on nitrate accumulation, while the influence of the season of production is less pronounced.
Keywords: nitrates; nitrogen fertilization; nitrogen sources; radishes
Citation: Yankova, P., & Boteva, H. (2024). Influence of the factors rate and form of nitrogen fertilization on the accumulation of nitrates in radishes. Bulgarian Journal of Soil Science Agrochemisty and Ecology, 58(4), 3-11 (Bg).
| References: (click to open/close) | BDS EN 12014-2:2018. Foodstuffs - Determination of nitrate and/or nitrite content - Part 2: HPLC/IC method for the determination of nitrate content of vegetables and vegetable products
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| Date published: 2024-12-19
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