The research has been aimed at assessing the different technological procedures of soil treatment for silage maize and spring barley in conditions of potato-growing region on sandy loam brown soil in view of yields and technological quality of products. Field trials were established at the station at Stritez near Trebic in 1986 to 1989. The following systems of soil cultivation were tested within the trials performed: - silage maize (1986 to 1988) 1. stubble breaking, manuring, medium-deep tillage (0.10 to 0.12 m); 2. manuring, medium-deep tillage, deep tillage (0.18 to 0.22 m); 3. stubble breaking, manuring, medium-deep tillage, skewed loosening (0.40 m); 4. manuring, medium-deep tillage, skewed loosening; - spring barley (1987 to 1989) I. traditional cultivation - medium-deep tillage (0.18 to 0.22 m); II. minimum cultivation (0.10 to 0.15 m). Forecrop soil cultivation in the spring was identical in all variants. Organic manuring to silage maize was uniform in all variants of soil cultivation. The rate of 40 t per 1 ha of manure was applied. The following indicators were tested in silage maize: green and dry matter yields ( t per 1 ha; feeding characteristics: fibre (%), ashes (%), fat (%), crude protein (N.6.25; %), nitrogen-free extract - BNVL (%), starch value (SH). In spring barley: grain yields (t per 1 ha), number of plants (per m2), number of spikes (per m2), 1000-kernel weight - HTZ (g), screening on 2.5 mm mesh sieves (%), crude protein content in grain (N.6.25; %). The data obtained were processed statistically by variance analysis and minimum significant difference D(T) was calculated. The yield response of silage maize to different intensity of soil cultivation and elimination of stubble breaking was statistically insignificant (Tab. I). A similar conclusion is referred by H r u b y, P r o c h a z k o v a (1990) in the conditions of sugar beet-growing region. Contrary to this, the effect of different soil cultivation in more arid conditions of maize-growing region (Prochazkova, Hruby, 1989) was statistically significant. The technological procedures used for soil cultivation to silage maize bad not more significant influence on studies feeding characteristics in dry and green matter(Tabs II and III). Statistically significant difference was found only in fat content in spadix when the highest value was observed in the variant with stubble breaking, manuring and medium-deep tillage. Silage maize was followed with spring barley in which, except direct effect of different soil cultivation on the grain yield and some indicators of its technological quality residual action of studies technological procedures of soil cultivation to forecrop was studied, i.e. to silage maize (Tab. IV). It followed from the results that different intensity of soil cultivation to spring barley had no significant effects on the grain yield. An analogous conclusion is referred to also by e.g. H r u b y (1987) in the conditions of maize growing region and H u d c o v a (1990) refers to the data of sugar beet-growing region. The highest grain yield was recorded in the variant 1 (only with medium-deep tillage) when evaluating the yield responses of spring barley to the forecrop. 1000-kernel weight and screening on 2.5 mm mesh sieves were analyzed out of mechanically determined grain indicators which were very balanced in view of soil cultivation to spring barley and to forecrop, as well. In spite of insignificant difference in crude protein content (N.6.25) in spring barley grain among variants, the tendency towards lower content at lowered intensity of soil cultivation was confirmed. The decreases amounted to 0.22 % on an average in minimization in comparison with medium-deep tillage.
