18. Effect of different fertilizing systems on productivity and N, P & K taken up from brewing barley variety Kamenica

The effect of different feztilizing systems on productivity and nutritional uptake from brewing barley variety Kamenica, grown on medaw soil Plovdiv region was studed. The studded fertilizing systems were: 1. unfertilized; 2. N₄P_7,5K₅; 3. N₈P_7,5K₅; 4. N₁₂P_7,5K₅; 5. 6 t/dka manure + NP; 6. N8P0K5; 7. N8P7,5K0. The different fertilizing systems led to different yield increasing from 56,6 to 171,7 % in comparison with unfertilized variant. The nitrogen fertilization had crucial effect on the yield. The exclusion of phosphorus from mineral fertilizing system decreased barley productivity average with 78,3 % in comparison with analogy system but phosphorus ensured. The exclusion of potassium had not effect on barley productivity. The fertilized plants were taken up from 6,8 to 13,9 kg N/dka, from 1,2 to 4,7 kg P₂O₅/dka, from 4,8 to 13,1 kg K₂O/dka. The brewing barley variety Kamenica up take from 2,25 to 3,30 kg N, from 0,6 to 1,2 kg P₂O₅, from 1,85 to 3,28 kg K₂O for formation of 100 kg main production.