Effect of calculated doses of fertilizers on crop rotation fertility in conditions of the Cis-ural steppe of the Bashkortostan Republic
The article presents the results of studies on effeсt of calculated fertilizer doses on yields of rotated crops. Fertilizers were applied on average of once in two years in conditions of the Cis-Ural steppe of the Bashkortostan Republic. It increased yields of rotated crops by 26-32 % and resulted in 3,28-4,32 t/ha of cereals. Average annual yields of rotated crops were as follows: 2,23-2,36 t/ha of spring wheat grain, 2,3-2,45 t/ha of spring rape seeds, 36,9-38,1 t/ha of sugar beet. Fertilizers increased nitrogen and potassium yield per 11 of spring wheat grain, spring rape seeds and sugar beet while phosphorus yield didn't change. When applying calculated doses of fertilizers in all the experiment variants it resulted in zero nitrogen balance and negative potassium level. Phosphorus balance was positive at the largest dose and negative at the smallest one. Calculation of fertilizer application proved its efficiency in terms of farming practices and advantage in terms of energy.