Soil Sciences at Universität Trier

Flashcards and summaries for Soil Sciences at the Universität Trier

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Particle size distribution of clay, silt and sand 

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Formula Density 

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Density of Quarz in solid phase 
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Diameter of the different pore types 

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Definition permanent wilting point (PWP) 

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Definition pF value 

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How can plants take up nitrogen ? 
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Macronutrients 

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How can plants take up phosphorus? 

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Which are the main elements that are important for plants growth ? 

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What are the factors influencing leaching ? 
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Which is the optimum level of fertilisation ?

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Exemplary flashcards for Soil Sciences at the Universität Trier on StudySmarter:

Soil Sciences

Particle size distribution of clay, silt and sand 
  • Clay = anything below 2 micrometer 
  • Silt = 2 - 63 micrometer 
  • Sand = 63 - 2000 micrometer 
  • Gravel = 2-4096 millimeters 
  • cobbles = 64 - 108 millimeters 
  • Blocks = 4.1 - 65.5 meters   

Soil Sciences

Formula Density 
D = M/V


Keep in mind: the lower the density, the higher the volume 

Soil Sciences

Density of Quarz in solid phase 
2.65 g/cm3

Soil Sciences

Diameter of the different pore types 
  • Wide coarse pores: >50 micrometer 
  • Narrow coarse pores: 50 - 10 micrometer 
  • Medium pores: 10 - 0.2 micrometer 
  • Fine pores: < 0.2 micrometer 

Soil Sciences

Definition permanent wilting point (PWP) 
Point at which the water is strongly fixed in the pores and the plants are not longer able to get the water out of the pores. Located between medium and fine pores

Soil Sciences

Definition pF value 
  • Water suction level 
  • If it increases to 4 ~ 4.2 the plants are not longer able to access water 
  • If water suction level = 0 than saturated conditions 

Soil Sciences

How can plants take up nitrogen ? 
In from of Nitrate No3- or Amonium NH4+

Soil Sciences

Macronutrients 
  • Nitrogen 
  • Potassium (K) 
  • Calcium 
  • Magnesium 
  • Phosphorus 
  • Sulfur 

Soil Sciences

How can plants take up phosphorus? 
In form of Phosphate (PO4^3-) 

Soil Sciences

Which are the main elements that are important for plants growth ? 
  • Oxigen 
  • Carbon 
  • Hydrogen 
  • Nitrogenoxide 
  • Nitrogenhydrate 

Soil Sciences

What are the factors influencing leaching ? 
  • Weather 
  • Properties of the soil (ironoxides, clay minerals, organic matter)
  • Sorption size 
  • Amount of nutrients 

Soil Sciences

Which is the optimum level of fertilisation ?
Level C
Only adding the amount of nutrients which has been taken up by plants 

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Science at

Swami Ramanand Teerth Marathwada University

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IUBH Internationale Hochschule

SOIL at

University of Delhi

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