Effectiveness of urea-ammonia liquor KAS-32 and compound NPK fertilizer in linseed flax growing with minimal tillage in the Salair zone

Of the major nutrients, linseed flax consumes and removes more nitrogen than other nutrients. Pre-sowing application of urea-ammonia liquor KAS-32 in rates of 100 and 150 L ha together with seedbed application of compound NPK fertilizer (diammophoska) (100 kg ha) contributed to greater nitrogen consumption. In seeds, on two-year average, it was 3.38-3.74% compared to 3.19% in the control; the potassium content at 0.65% in the control for the variants with KAS-32 was in the range of 0.54-0.77%, at 0.73% for the combination of N74P26K26, amounting to 0.54% for N53P26K26. The phosphorus level was in the range of 0.50-0.53% compared to 0.48% in the control. At the same time, the content levels of nitrogen and phosphorus in straw were lower, and potassium content was higher than in linseeds, respectively 0.53-0.79%, 0.065-0.9% and 0.88-1.08% compared to 3.19-3.74, 0.48-0.65 and 0.54-0.77%. The experiments showed the positive effect of fertilizers applied on such basic elements of the yield formula. In the variants with urea-ammonia liquor KAS-32, the two-year average plant density was 331-341 pcs m2 compared to 272 in the control; the number of capsules was 13.8-13.9 pcs per plant compared to 9 pcs, or it was 1.4-1.42 times higher. Linseed yields increased from 1.28 t ha to 1.76-1.85 t ha, or by 37.5 and 44.5%. The protein content increased from 18.5 to 20.3-21.9%, and the oil content increased from 46.7 to 46.2-47.8%. One seedbed application of compound NPK fertilizer (diammophoska) provided high oil accumulation of 50.6 and 44.6% on both years and on two-year average - 47.6%. The cost recovery of 1 kg of primary nutrient ranged from 2.09 kg in the variant with of compound NPK fertilizer (diammophoska) and 4.52–4.57 kg in combinations with urea-ammonia liquor KAS-32.