Published in Scientific Papers. Series A. Agronomy, Vol. LXVIII, Issue 1
Written by Stanimir ENCHEV, Velimir DONCHEV
The research was carried out between 2021 and 2023 in the experimental fields of the Agricultural Institute - Shumen, Bulgaria. The aim of this study was to establish the yield structure and productivity of grain sorghum, Sudangrass and grain maize tested as a second crop after wheat and fallow predecessors. The results over three consecutive years indicate that fallow is a better predecessor and the plants sown on it develop much more intensively and accumulate more mass than the wheat predecessor, despite the shorter vegetation periods. The green mass yields of Sudangrass, sown on fallow significantly exceeded the yields obtained with the wheat predecessors. Similar results were obtained with sorghum and maize. In all three years, maize and sorghum with a fallow predecessor managed to form seeds and reach the milky-wax maturity stage, which is an important prerequisite for the production of green silage. Crops sown on fallow, despite their early sowing, lag behind in growth and form only short stems and foliage.
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