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<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008Figure 5. The GIS cartogram of the thickness of horizon Ap in the Kurpnieki massif.It was established that increased resistance of the subsoil layer over 600 kPa cm -2(resistance being determined in spring) has a negative impact on the on the yield of winter wheat.However, in autumn the soil resistance, which is determined before sowing, and the GIS has amore positive impact. The research results of the years 2005 and 2006 in the Kurpnieki massifconfirmed the previous conclusions that deep loosening of soil should be carried out when thepenetrometric resistance of soil exceeds 600 kPa cm -2 (see Figure 6).t ha -18,58,07,57,06,56,05,55,04,54,07,367,12 7,44 7,506,796,936,02379 442 646 275 359 437 58608.10.2005. 03.05.2006.soil penetration resistanceFigure 6. The yields of winter wheat in various soil resistance intervals in the lower layer of thearable land from 20 to 50 cm.The local GIS map formed on the basis of the data of the penetrometric resistance measurements ofsoil allowed the drawing of the conclusion that the total amount of deep loosening of the soil in theKurpnieki massif can be reduced by 48 % of the entire area.56
<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008ConclusionsConcerning the question of yield capacity of winter wheat the organic matter content in soiland the thickness of horizon Ap are of essential importance in the decision making system aboutthe soil tillage differentiation.The GIS cartograms allow site specific reduction of the basic tillage depth when thethickness of the horizon Ap is greater than 36 cm, which constituted 60.1 % of the total area of theexperimental field.At the GPS points with the average organic matter content 1.8 and 3.1 % the introductiondepths of the seeds of winter wheat were respectively 3.2 and 3.7 cm (P
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