Sulphur and its effect on yields and oil content in winter rape
1999
Richter, R. | Hrivna, L. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
Optimal nutrition is inevitable if the production of winter rape is to be successful. In addition to the basic nutrients, nutrition also includec sulphur. Due to considerable reduction of emmision the levels of soil sulphur have decreased. If required levels of sulphur are not available, the utilisation of nutrients substantially decreases resulting in lower plant yields. In 3-year experiments on soils containing less than 20 mg/kg of water-soluble sulphur and optimal levels of P, K, Ca and Mg, the effect of folilar applications of sulphur in the DC 29-30 stage (in ammonium sulphate with DAM 390 and in Agrosam) on the N/S and P/S ratios in stage DC 50 was found to be positive. If the level of sulphur in the above-ground biomass increased more than 0.35%, yields increased from 4.21 t/ha to 4.63 t/ha (i.e. +10.3%). Foliar applications of 25 kg S/ha slightly increased the oil content in seeds and increased oil production (by 11.9%), giving an average yield of 1.98t of oil per hectare
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