The effect of the content of water-soluble sulphur in the soil on utilisation of nitrogen and on the yields and quality of winter rape
2001
Hrivna, L. | Richter, R. | Losak, T. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
In pot experiments conducted in 1997-1999 we studied the effect of increasing doses of N (0.3, 0.6, 0.9 and 1.2 g per pot) under the increasing content of water-soluble S in the soil and constant nutrition with other nutrients on the concentration of N and S in winter rape (variety Lirajet) in the DC 31-39 stage. A content of water-soluble S lower than 20 mg/kg decreased the S concentration in plants below 0.6 %. An increased content of water-soluble S in the soil increased its concentration to more than 0.7 % as early as in the DC 31-39 stage and created favourable conditions for increased N utilisation for yield formation. Lower doses of N fertilisation had a positive effect on seed yields even when the content of water-soluble S in the soil was only 30-40 mg/kg. The S dose must be adapted to the dose of N which ensures its optimal content in the plant. N nutrition of winter rape accompanied with a suitable S content significantly increased yields, stabilised the oil content, increased the production effect and the index of N efficiency.
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