ИЗСЛЕДВАНИЯ ВЪРХУ ПОЛСКИТЕ КУЛТУРИ
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ДОБРУДЖАНСКИ ЗЕМЕДЕЛСКИ ИНСТИТУТ
гр. Генерал Тошево
 

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 Пълна версия ORIGINAL PAPER
 
Influence of the urea fertilization on the N, P, K and crude protein content in grain of winter barley (Hordeum vulgare L.)
  Nesho Neshev • Mariyan Yanev • Anyo Mitkov • Tonyo Tonev  
Agricultural University of Plovdiv, Bulgaria
 
     Резюме
 
During the period 2017-2018, a field study with winter barley (Hordeum vulgare L.) was conducted. The experiment was situated in the experimental field of the base for training and implementation of the Agricultural University of Plovdiv, Bulgaria. The trial was conducted by the randomized block design in 4 replications with the winter barley variety “Emon”. The experiment included unfertilized control and three variants with fertilizer application that included Urea 125 kg/ha, Urea 165 kg/ha and Urea 250 kg/ha. The fertilization was performed in late winter - February. With the increasing of the fertilizer rates the nitrogen content in grain also increased. The highest nitrogen content was reported after the application of Urea 250 kg/ha – 2,62% average for the period. No influence of fertilization on the phosphorus content in the grain was found. At all variants, including the unfertilized control, the content of this macronutrient varied from 0,53% to 0,54% and the difference between the variants was not statistically proved. With increasing of the fertilizer rates, the potassium content in grain decreased. The potassium content in barley’s grain was the highest for the unfertilized control – 0,41% and was the lowest after the application of Urea 250 kg/ha – 0,32% average for the period. The differences in the potassium content in grain between the two variants were statistically proved. A positive correlation regarding the crude protein content in grain was established. With increasing of the urea rates the grain crude protein content increased. The highest content of crude protein was recorded after the application of Urea 250 kg/ha – 14,90% average for both experimental years.

Key words: Barley, Content of N, P and K in grain, Fertilization, Urea