Differences of soil agrochemical properties in connection with altitude in winter wheat
2010
Dinaburga, G., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Soil and Plant Sciences | Lapins, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Soil and Plant Sciences | Kopmanis, J., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Soil and Plant Sciences
Investigations were carried out in 2005-2007 in Kurpnieki field on the Research and Training Farm Vecauce of the Latvia University of Agriculture. Researches were performed out in the stationary observation points. The aim of the study was to clarify relationships between unregulated factors - relative height above the sea level and soil pHKCl, potassium and phosphorus content in soil - in winter wheat growing conditions. The results showed that the most important factor that effected differences in the content of potassium and phosphorus in soil arable layer was precipitation water flows caused by curvature of mezorelief. A decision for differentiation of the dose of potassium and phosphorus fertilizers could be made only after analysis of the direction of water run-off. The smallest thickness of humus horizon as well as significantly increased soil reaction pHKCl was detected at the watershed in field sites with increased relative height. The winter wheat yield maps and study of the results of soil moisture show that soil moisture is the uppermost factor determining the winter wheat grain yield level.
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