Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 2
Written by Stanimir ENCHEV, Georgi KIKINDONOV, Kalin SLANEV
Three grain sorghum varieties have been tested in field trials during the period 2017-2018 with variants of beet and sorghum (monoculture) forerunner crops, and mineral Nitrogen fertilization. The agro-climatic conditions are defining factor for the grain yield and the differences between the varieties in their reaction to fertilization and monoculture growing manifest themselves in the water deficiency conditions of the test period. The Nitrogen fertilization increases the average values of the yield to 113.0% when the applied dose is 20 kg N/da, and to 120.8% when 40 kg/da is the applied Nitrogen dose. The increase of the water deficit decreases the effects of mineralization and the influence of the forerunner crop. The yield of sorghum when grown in monoculture is with 11.6% less than the yield after good forerunner crop as the beet. The Nitrogen fertilization, even with lower doses of Nitrogen overcomes this negative effect. The variety Maxibel manifests the highest adaptability to the stress factors of monoculture growing and reacts with significant increase of the grain yield to fertilization.
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