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Effects of nutrient supply and sowing time on the yield and pathological traits of winter oilseed rape
- Pepó, P.
- Acta agronomica Academiae Scientiarum Hungaricae 2013 v.61 no.3 pp. 195-205
- Alternaria, Brassica napus var. napus, Peronospora, Phoma, Sclerotinia, fertilizers, hybrids, irrigation water, soil, sowing date, spring, temperature, water utilization, Hungary
- The fertilizer response of oilseed rape (Brassica napus var. oleifera f. biennis L.) was investigated on the chernozem soil in Eastern Hungary in a three-year experiment with two sowing times. The results proved that oilseed rape had high fertilizer (N+PK) demand. In the experiments, N = 210 kg ha ⁻¹ +PK proved to be the optimal fertilizer dose. The yield-increasing effect of fertilization was 800 to 1300 kg ha ⁻¹, depending on the year. The maximum yield (5000 kg ha ⁻¹) was obtained in the year with least infection. The excellent natural nutrient-providing ability of chernozem soil was confirmed by the high yield level (3000–4200 kg ha ⁻¹) of the control treatment (N = 0 kg ha ⁻¹ +PK). The results showed that the specific fertilizer utilization efficiency of oilseed rape decreased if the dose of N+PK fertilizer was increased (being 19–27 kg/1 kg NPK in the control treatment and 11–12 kg/1 kg NPK in the N = 210 kg ha ⁻¹ +PK treatment). On the other hand, fertilization improved the water utilization from 4–8 kg/1 mm precipitation + irrigation water to 11–14 kg/1 mm precipitation + irrigation water. The results of these studies confirmed that hybrid rape had excellent adaptability to the sowing time. The results of Pearson’s correlation analysis showed a strong correlation (0.6*–0.9**) between the spring precipitation and temperature and the most important diseases (Sclerotinia , Alternaria , Peronospora , Phoma) attacking oilseed rape.