Published in Scientific Papers. Series A. Agronomy, Vol. LXII, Issue 1
Written by Svetla KOSTADINOVA, Zhivko TODOROV, Ivan VELINOV
The response of grain protein concentration and yield of sorghum to nitrogen fertilization in rates 0, 60, 120, 180, 240 and 300 kg N.ha-1 was studied in the experimental field of Agricultural University of Plovdiv, Bulgaria in 2017-2018 under non-irrigated conditions. Without nitrogen fertilization sorghum hybrid EC Alize formed grain with 10.98%- 11.10% protein. Rate N300 significantly increased concentration of grain protein by 15.0% and 21.9%, respectively in 2017 and 2018, compared to N0 plants. Fertilization N60 - N300 proven increased grain protein yield over the N0. Rate N180 provided higher grain protein yield of 708 kg.ha-1 in 2017 and higher N240 and N300 rates showed a downward trend in protein yield within limits 677-708 kg.ha-1. In more favourable in terms of rainfall 2018, the highest grain protein yield 907 kg.ha-1 was obtained at N240. Application of N300 proven reduced by 80 kg.ha-1 the protein yield, compared to N240. Rates 0-300 kg N.ha-1 highly positively correlated with grain protein concentration (0.864**-0.962**) and protein yield (0.839**-0.874**) of sorghum.
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