The influence of conventional and minimal soil cultivation in interaction with mineral fertilization and utilization of the by-product on the spring barley yield, uptake of   nutrients by yield and energetic effectiveness in experimental years 2004-2006 was investigated in the experiment. Within each cultivation method, three treatments of fertilization were applied: 0 - control without fertilizing, PH - rational fertilization with mineral fertilizers, PZ - rational fertilization with mineral fertilizers and incorporation of post harvest residues into soil.  Different soil cultivation did not influence grain yield of spring barley statistically significantly. It was confirmed that barley does not react substantially onto the depth of soil cultivation. The highest average yield of grain (average of years and soil cultivation methods) was found in treatment with incorporated (ploughed-down) post-harvest residues (PZ). Higher grain yield was achieved under their shallow incorporation into soil (B 2 ).  On the average of three experimental years 54.4 kg of spring barley grain were produced per one kilogramme of NPK nutrients. Higher value was achieved under conventional soil cultivation than under minimalization one. In treatment where post harvest residues were incorporated into soil (PZ) the production of grain was by 6.3 kg higher than in treatment fertilized with mineral fertilizers. The highest amount of grain per 1 kg of applied nutrients (on the average of three years) was produced in treatment B 1 - PZ (67 kg), but under minimalization it was only 48 kg of grain. The values were changing in dependence on experimental year and were decreasing with increasing rate of nutrients. TNT seems to be relatively steady value. It expresses weight of grain in kilogrammes falling on 1 kilogramme of NPK nutrients taken up by the yield. In respective experimental years it ranged from 27.1 kg of grain (year 2004) to 29.9 kg (year 2006). Percentual portion of real natural production from theoretical one SNP/TNP = 192.7 %. Higher energetic effectiveness (E = 6.35) was obtained under conventional soil cultivation. The highest energetic effectiveness (E = 9.58) was calculated at the application of 40 kg ha -1 N in all 3 experimental years in treatment B 1 -PZ. When post harvest remains of forecrop were incorporated by ploughing into soil the values of energetic effectiveness were 3-times higher than in treatment fertilized with mineral fertilizers in all three experimental yearsxt.

spring barley, tillage of soil, mineral fertilizers, post harvest residue, nutrients uptake, energetic effectiveness

Presentation: oral