Mineral nutrition of wheat crops grown on acid soils is specific. Well-balanced nutrition with nitrogen and phosphorus is crucial, the latter nutrient having a higher impact. Studies of fertilization effects were conducted in a stationary field trial on a degrading vertisol soil with low pH (pH < 5.0). Six variants of mineral nutrition (N, NP 1 K 1 , NP 2 K 1 , NP 1 , NP 2 and NK 1 ) and untreated control (without nutrition) were tested in the experiment. The rates of nitrogen application were 80 and 120 kg N/ha, and they were applied either individually or in combination with two phosphorus rates and a potassium fertilizer. Grain yields and protein contents in seven genetically divergent cultivars of winter wheat (Takovčanka, Ana Morava, KG–100, Lazarica, KG–56S, KG–4 and KG–5)were analyzed. The investigation displayed considerable variation in the cultivars grain yields and grain protein contents depending on mineral nutrition. The cultivars Ana Morava and Takovčanka achieved the highest grain yields under mineral nutrition involving a combination of three mineral elements: N, P and K (120 kg N, 100 kg P 2 O 5 and 60 kg K 2 O), and under NP treatment at a rate of 120 kg N and 60 kg P 2 O 5 . The cultivar KG–56 S had the highest protein content, while the lowest was achieved by KG–5. The highest increase in grain protein content was achieved by applying NP nutrition at the rates of 120 kg N and 60 kg P 2 O 5 , as well as by NK nutrition at 120 kg N and 60 kg K 2 O.

mineral nutrition; wheat; cultivar; proteins; grain yield

Presentation: oral