Changes of nitrogen assimilation and intracellular fluid pH in plants of barley depending on bulk density of compacted soils
¹Institute of Field Crop Husbandry, Estonian Agricultural University
²Institute of Soil Science and Agrochemistry, Estonian Agricultural University
³Estonian Research Institute of Agriculture
The penetration resistance of different arable soils is quite different depending on the Estonian area. We are briefly introducing the results of our research on soil compaction, penetration resistance of different soils in Estonia, uptake of nutrients and changes of intracellular fluid pH of barley depending on soil bulk densities. These data were mainly collected in a research field (58º23´N, 26º44´E) of the Estonian Agricultural University, with different levels of soil compaction (10 levels) on sandy loam Fragi-Stagnic Albeluvisol (WRB) soil in 2001 and 2002. The investigated cultural plant was spring barley (Hordeum vulgare L.). In Estonia H. Loogus has studied changes of cellular fluid pH, depending on seedbed, by using microelectrodes directly on plants by quick method. The effect of soil bulk density on cellular fluid pH of barley leaves generally depends of number of passes. The experiment showed also that a higher decrease in nitrogen content started at the same soil bulk density value as the cellular fluid pH quickly increased. If the soil bulk density was increasing up to level 1.52–1.54 Mg m-3, the cellular fluid pH suddenly increased very quickly. Nitrogen assimilation change in plants of barley decreased at the same bulk density values as a remarkable increase of intracellular pH was observed.