Influence of long-term application of mineral fertilizers on winter wheat yield and quality

Field trials on long term application of mineral fertilizers were started in 1966 on turfy-gley clay loam soil of the Experimental station of Lithuanian University of Agriculture (Lithuanian Academy of Agriculture). Four-field crop rotation: barley, perennial grasses and winter wheat.. Influence of nitrogen, phosphorus and potassium fertilizers, and their combinations on the yield of main and side production, on yield quality and agrochemical characteristics of the soil have been established. Systematic application of nitrogen-phosphorus-potassium combinations has been established to gradually increase of the winter wheat from 3,15 Mg ha-1(I rotation) to 5,31 Mg ha-1 (VIII rotation). The following characteristics have been established to obtain the yield of winter wheat 6,0 t/ha: pH(KCl) - 6-7, hydrolitic acidity - 3-5 meqiv kg-1, mobile phosphorus content - 180-200 mg and potassium - 140-160 mg kg-1 soil.