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Vliv stupňovaných dávek dusíku na výnos a kvalitu osiva kukuřice
Dostál, Jiří
This paper undertakes an assessment of the impact of staggered doses on the yield and quality of maize seed. The task was resolved in the form of a semi-operational field test on a seed multiplication field for maize in the municipality of Kelčany in 2016. 90 kg.ha-1 N was applied to all variants, followed at the 10-leaf stage by a staggered application of nitrogen contained in DASA fertilizer. The test comprised five variant dosages: 1st - fertilized with 120 kg.ha-1 N, 2nd - 90 kg.ha-1 N, 3rd - 60 kg.ha- 1 N, 4th - 30 kg.ha-1 N, and 5th variant - no fertilizer. After harvesting, grain yield at t.ha-1 was determined at 14 % dry mass. For determining the quality of seed, the maize was calibrated by grain size fractions and the germination rate was tested. For Variant 1, which received the highest fertilizer dosage, the highest grain yield was established compared to the control group. For the other variants, no substantial difference in yield was observed. Based on this one-year field test, the most suitable nitrogen doses in relation to yield and seed quality are 90 kg.ha -1 N and 60 kg.ha-1 N.
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