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Modelling the deformation of cell to loads using model cell of rubber ball filled with water

100%

Umeda M., Namikawa K.

International Agrophysics

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1994

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tom 08

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nr 4

2

Some ecological consequences of soil degradation under Estonian conditions

80%

Kuht J., Nugis E., Reintam E.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2006

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tom 508

The extreme soil compaction and standard indices for Estonian soils sted to sustainable crop production are worked out which could be a basis for chracterizing the agro-ecological conditions for some particular soils. Comparison of measurements showed, that increase of subsoil hardness by compaction is mostly visible in soils with relatively weak agro-technical capability (90 and 120 kPa). The penetration resistance of arable soils is quite different depending on Estonian area. We are briefly introducing our results concerning the influence of soil compaction on penetration resistance of different soils in Estonia, on uptake of nutrients and new viewpoints concerning the changes in cellualar fluid pH of barley as depended on the soil compaction. Concerning degree of intracellular fluid pH we could conclude that this method is rather sensitive and allows us to find out plausible relations between the CpH compaction of soil and the level of the nitrogen fertilizer. Our contribution to this work justified itself and allowed us to analyse from a new point of view the positive as well as negative aspects of the effect of soil compaction and level of nitrogen fertilizer. Without nitrogen fertilizer the influence of soil compaction is rather negative. The effect of soil bulk density on cellular fluid pH of barley leaves generally depends on the number of passes. The experiment showed also that stronger decrease of nutrient content started at the same soil bulk densityvalue, at which the cellular fluid pH quickly increased. If the soil bulk density- increased up to level of 1.52-1.54 Mg·m⁻³, the cellular fluid pH increased very quickly.

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Zmiany potencjalu osmotycznego soku komorkowego lisci selera i buraka w zaleznosci od wybranych czynnikow meteorologicznych

80%

Stabryla J., Grzesiak S.

Acta Agrophysica

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2004

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tom 03

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nr 2[105]

375-384

Ograniczanie wyników

1 Acta Agrophysica

1 International Agrophysics

1 Zeszyty Problemowe Postępów Nauk Rolniczych

1 Grzesiak S.

1 Kuht J.

1 Namikawa K.

1 Nugis E.

1 Reintam E.

1 Stabryla J.

1 Umeda M.

1 2006

1 2004

1 1994

Modelling the deformation of cell to loads using model cell of rubber ball filled with water

Some ecological consequences of soil degradation under Estonian conditions

Zmiany potencjalu osmotycznego soku komorkowego lisci selera i buraka w zaleznosci od wybranych czynnikow meteorologicznych