Abstract

The study of the content and removal of nitrogen, phosphorus and potassium by linseed flax plants of the oilseed variety Severniy showed that more nitrogen and phosphorus accumulated in seeds, and potassium -in straw. The average content levels in seeds were as follow-ing: N -4.79%, P2O5 -0.79%, K2O -1.05% as compared to respective levels in straw: 0.64%, 0.1% and 1.73%. When applying fertilizers, the content of all nutrients in the straw decreases, and in the seeds it mainly remains at the con-trol level. Due to the higher crop yields in all fertilized vari-ants, the removal of phosphorus and potassium exceeds the control; and nitrogen removal –in the variants with a higher rate of nitrogen application. With seeds, an average of 87-87.8% of nitrogen and phosphorus and 37.3% of potassium from the total removal is removed from the field. Increased rate of nitrogen application contributes to greater consumption of not only nitrogen but also phosphorus and potassium. The rates of nitrogen application in the experi-ments do not compensate for its yield removal with seeds; that requires increased nitrogen application against the background of phosphorus-containing fertilizers.

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