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Related Concept Videos

Adaptations that Reduce Water Loss01:57

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
Drying Shrinkage01:21

Drying Shrinkage

When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
A portion of this drying shrinkage can be reversed; if the concrete is...

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Related Experiment Video

Updated: May 12, 2026

Production and Testing of Moisture Behavior and Thermal Properties of Rapeseed Straw and Ganoderma resinaceum Mycelium Bio-Composites
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Drying behaviour of rapeseed under thin layer conditions.

Raj Kumar1, Surjeet Jain, M K Garg

  • 1Central Institute of Post-harvest Engineering and Technology, Ludhiana, 141 004 India.

Journal of Food Science and Technology
|April 11, 2013
PubMed
Summary

Thin layer drying of rapeseed (Brassica campestris) varieties was studied. Drying above 55°C significantly reduced germination and seed vigor, while temperature significantly affected drying time, not variety.

Keywords:
Brassica campestrisDrying modelRapeseedThin layer drying

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Area of Science:

  • Agricultural Engineering
  • Food Science
  • Crop Science

Background:

  • Rapeseed (toria, Brassica campestris) is a vital oilseed crop.
  • Understanding optimal drying conditions is crucial for maintaining seed quality and viability.
  • Previous research has explored thin-layer drying but specific variety responses require further investigation.

Purpose of the Study:

  • To investigate the thin-layer drying behavior of three rapeseed varieties ('TL-15', 'TH-68', 'Sangam').
  • To evaluate the modified Page's equation for predicting drying time.
  • To determine the impact of drying temperature on seed quality parameters like germination and vigor.

Main Methods:

  • Thin-layer drying experiments were conducted on rapeseed varieties at temperatures ranging from 30°C to 70°C with a constant air velocity of 2 m/sec.
  • Experimental drying data was fitted to the modified Page's equation to assess its predictive validity.
  • Drying constants for the modified Page's model were calculated for each variety and temperature.
  • Germination percentage and seed vigor index were measured to assess seed quality post-drying.

Main Results:

  • Drying air temperature significantly influenced the drying time of rapeseed.
  • Rapeseed variety had a non-significant effect on drying time.
  • Seed germination and vigor remained unaffected up to a drying temperature of 55°C.
  • Drying above 55°C led to a drastic reduction in germination and vigor (16-20%).

Conclusions:

  • The modified Page's equation is a valid model for predicting thin-layer drying time in rapeseed.
  • Optimal drying temperature for maintaining rapeseed quality (germination and vigor) is below 55°C.
  • Drying temperature is a critical factor affecting both drying kinetics and seed viability in rapeseed.