EFFECT OF NPK FERTILIZATION AND YEAR ON T HE VALORIGRAPHIC QUALITY OFWHEAT-VARIETIES

The valorigraphic parameters (valorigraphic index, water absorption ca pacity, dough development time, stability, softening, extension) of gr ain yield of two winter wheat varieties were studied for 2 years in an NPK fertilization experiment set up at the Trial Station of the Cerea l Research Institute at Fulopszallas on highly calcareous meadow soil rich in humus. Based on the results the valorigraphic parameters of th e wheat varieties depended in different degrees on the weather conditi ons of the year and the fertilization treatments. The effect of the ye ar was the most remarkable on valorigraphic index, stability, softenin g and extensibility of dough, it was slight on the water absorption ca pacity of the flour, and non-significant on the swelling time. The eff ect of fertilizer treatments frequently varied depending on the variet y and year, the interaction of year x variety x fertilizer was strong. The N fertilization without PK in general increased each valorigraphi c parameter, apart from softening of dough, which in fact decreased. T he highest N dose (240 kg/ha) frequently failed to cause further impro vement in quality. The PK treatments without N had a varying effect de pending on variety and year. The valorigraphic index, stability, the e xtensibility of quality wheat GK Kata rose in 1990 as the results of h igher PK doses, while the same parameters decreased in 1991 as affecte d by higher PK doses. The joint application of N and PK fertilizers ch anged the parameters of GK Csuros to a less extent than those of GK Ka ta. The highest valorigraphic index was achieved in GK Kata in both ye ars by 240 kg/ha N treatment, in GK Csuros in 1990 by 90 kg P, 180 kg K and 120 kg N, and in 1991 by the treatment of 60 kg P, 120 kg K and 120 kg N active agent/ha.