Thirty Years of Monitoring Nitrogen Reserves in Beet Fields
2020
Chochola, Jaromir | Pavlu, Klara
Since winter 1986/1987 with short breaks in the 1990s, the reserves of mineral nitrogen in about 40 sugar beet fields are measured; the measurements take place in the early spring in soil layers 0-30, 30-60, and 60-90 cm. A report on these measurements is issued with the intention to enable the growers to get an idea about the regional nitrogen reserves and fertilization needs. Nitrogen reserves declined slowly until winter 2012/2013, but in recent years they have risen again to levels approaching 200 kg/ha N. Nitrogen reserves show significant regional differences. Pre-spring reserves are demonstrably affected by rainfall in the period October-February, lower reserves occur at rainfall higher than 200 mm. High nitrogen fertilization of sugar beet is the subject of discussion, as it does not take into account the sufficient reserve in soil and the causes of high reserve. Residual, unused nitrogen remaining in soil after the harvest of pre-crop and its gradual accumulation is seen as an important cause.
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