The effect of sowing date was examined in a two-factor, split-plot winter wheat experiment set up in Martonvásár on chernozem soil with forest residues in 1999-2001. The responses of 15 Martonvásár wheat varieties were analysed at four sowing dates (A - early, B - optimum, C - late, D - very late). The forecrop was pea, which is favourable for the nutrition of wheat, so 140 kg · ha-1 N and 80 kg · ha-1 each of P2O5 and K2O were applied to each plot. The greatest difference between the heading dates of the genotypes, averaged over the sowing dates, was 5.9 days. Each day's delay in sowing caused a delay in heading of 0.10-0.16 days, depending on the year. When the variety means were examined for each sowing date, the extreme values for the differences in heading date over the 3 years of the experiment were 2.2 and 9.7 days. During the first two years of the experiment the plant height-reducing effect of later sowing was significant in all the treatments. In 2001 this was only true for the very late treatment. Sowing in the first half of October proved to be optimum for the grain yield in all three years, but the first sowing date in 2000 and the first and third sowing dates in 2001 did not differ significantly from this treatment. A quadratic function was fitted to the means of the varieties, which were divided into 4 response groups on the basis of yield potential and sowing date sensitivity. According to the characteristic parameters of the functions, varieties with above-average yield potential and less sensitivity to sowing date had a maximum yield of 7.60 t · ha -1 when sown at the optimum date and a yield reduction of 0.13% · day-1 as a function of sowing date. Varieties with below-average yield potential and great sensitivity to sowing date had a maximum yield of 6.92 t · ha-1 and a yield reduction of 0.19% · day-1.
|Translated title of the contribution||Comparative studies on the sowing date responses of winter wheat varieties|
|Number of pages||11|
|Publication status||Published - Feb 1 2003|
ASJC Scopus subject areas
- Agronomy and Crop Science