Infestation of soft spring wheat by leaf diseases depending on nitrogen nutrition

Infestation of soft spring wheat plants depends on the growth stage and weather conditions growing season. Plants have highest resistance to brown rust in tillering stage. Brown developed 2014 throughout The lowest infestation intensity was during – booting stage, which did not change from experiment variant 5.0 %. spread 10 %, 40 assessed 8 points. In earing increased no fertilizer variants P30K30 8.0–8.2 % or by 60 with a 7 This indicator nitrogen fertilizers 4.1–4.3 points, but all stems were infected (100 spread). Affected leaves middle layer, as their E. Saari J. M. Prescott scale at 5 had least milk grain. 15.2–18.7 2.1–4.7 times compared 6 All affected (resistance 1 point). 2015, appeared However, insignifcant 5.0–6.5 depending variant. prevalence decreased unfertilized areas 30 phosphorus–potassium background up fertilizers. Plant high 7–8 points Powdery mildew develops season both research years. 2014, is 7.7–8.0 50 spread, plants, 44.1–46.8 5.8–5.9 affected, 3 subsequent stages growth, powdery increased. Thus, this 65.1–69.2 8.5–8.7 times, 9.5–9.7 fertilizer. 2 Key words: leaf rust, mildew, intensity, resistance.