Criteria for the site specific soil tillage
2007
Lapins, D. | Vilde, A. | Berzins, A. | Plume, A. | Dinaburga, G.
Investigations were carried out in 2004-2006 at 47 stationary observation points on the production plantations of the Kurpnieki massif, the Vecauce Research and Training Farm (Vecauce RTF) of the Latvia University of Agriculture (LUA), into the factors that affect the yields of winter wheat and winter canola. The yields in these trials were determined by means of the yield maps developed by using the Claas Lexion 420 GPS and the AGROCOM Software. As the factors affecting the yield were studied: thickness of horizon Ap of soil, the organic matter content in soil, the penetrometric resistance of soil in its deeper layers to the depth of 50 cm, the soil and the subsoil moisture. The research was carried out at stationary observation points of the local GIS of the farm. A significant impact of the observation time and soil moisture was established on the differences in soil resistance. A different penetration resistance of the subsoil layer affects the yield rather than soil resistance in its upper layer. Measures for the minimisation of soil resistance should be planned when the penetrometric resistance of soil in its deeper layers to the depth of 30 to 50 cm is within the range of 600-700 kPa cm-E2.
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