Starch content in grain of selected winter wheat varieties

In two-year trials the starch content in selected set of winter wheat varie ties listed in the Slate Varietal Book of the Czech Republic was studied. S creening of the whole set of varieties was conducted in ecological conditio ns without fertilization and pesticides applied. Moreover, starch content o f new wheat varieties, wheat varieties from different localities of the Cze ch Republic - experimental test rooms of the Central Control and Testing In stitute for Agriculture was investigated. Furthermore, wheat varieties cult ivated at various intensity, i.e. without fertilizers and pesticides, with fertilization of 96 kg N, 60 kg P2O5, 60 kg K2O per I ha were analyzed, see d was treated and herbicide was applied. At higher intensity fungicide, ins ecticide and growth regulator were applied in addition. In most of trials t he Varieties Samanta, Siria, Astella, Saskia, Torysa, Trane, Versailles and Estica had higher starch content (Tabs I, II, III). In the Trane varieties which had otherwise high gluten content, gluten was badly washing out what had an unfavourable effect on the technology of starch production. Out of the trials conducted in various regions of the Czech Republic the varieties Siria, Trane and Samanta had higher starch content in potato and fodder cr op growing regions (Tab. IV) had higher starch content. The prerequisite ha s been thus confirmed that it would be possible to cultivate wheat for star ch production purposes in the so-called marginal regions. All varieties in which higher starch content was recorded are recommended for growing in the se regions and offer here high yields. The effect of various intensity of c ultivation (Tab. V) was not manifested significantly on the starch content. At this way of cultivation bad washing out of gluten from flour was manife sted in some varieties. Wheat yield, and hence also total starch production per 1 ha, was significantly higher at medium and high intensity of cultiva tion which is also recommended due to better technological properties durin g gluten washing out.