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Uplatnění hnojení do depa v technologii pěstování kukuřice
Koryťák, František
The aim of the diploma thesis was to assess the effect of autumn application NP/NPK fertilizers placed as a subsurface depot and spring application of stabilized urea to subsurface depot (d) or broadcast application (b) on the yield of corn grain. The problematics was solved through a three-years small-plot field trial (harvest 2020, 2021, 2022) at the experimental station in Žabčice at Brno. The following fertilization combinations were included in experiment: 1. Unfertilized + urea IU and IN (b), 2. NP + urea IU and IN (b), 3. NPK + urea IU and IN (b), 4. NPK with zeolite + urea IU and IN (b), 5. Unfertilized + urea IU and IN (d), 6. NP + urea IU and IN (d), 7. NPK + urea IU and IN (d). Stabilized urea contained a urease inhibitor (IU) and nitrification inhibitor (IN). Corn grain yields were strongly influenced by the weather in individual years. Fertilizer placed as a subsurface depot increased grain yields compared with broadcast application only in one of the three monitoring years. Autumn application of NP/NPK fertilizers to a localised subsurface depot increased grain yield, for NPK fertilizers this increase was statistically significant in the first two years. Autumns application of fertilizers to subsurface depot with the spring broadcast application of nitrogen increased the yield of grain in two years, only in one statistically significant for all fertilizers. The spring nitrogen placed as a subsurface depot increased the grain yield in the first two trial years, with only one yield increase being statistically significant. The last year showed significantly higher yields after broadcast application of nitrogen fertilizer. The risk of technology application fertilizer placed as a subsurface depot is, among other things, soil processing using strip-till at low humidity.
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