Physical Properties and Moisture Effects of Agricultural Seeds

Agricultural seeds display a range of physical characteristics—size, shape, mass, density, porosity, surface texture and mechanical strength—that govern their performance in storage, handling and processing. Moisture content is a key variable: as moisture increases, seeds typically swell, altering their dimensions, true and bulk densities, and porosity. Such changes influence flow behaviour, frictional interactions with contact surfaces and the forces required for cracking or rupture. Moisture‐induced variations also impact aerodynamic properties, which are central to pneumatic conveying, drying and separation processes. Quantitative understanding of these interrelated properties underpins the design of hoppers, graders, dehulling machinery and storage silos, and informs mathematical and computational simulations such as the discrete element method. Globally, knowledge of seed physical and moisture‐dependent traits enhances mechanisation, minimises post-harvest losses and optimises seed quality for food security and industrial applications.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Physical Properties and Moisture Effects of Agricultural Seeds publication trend

The graph below shows the total number of articles in physical properties and moisture effects of agricultural seeds across all publications each year (not limited to Nature Index journals).

Technical terms

Moisture content: The percentage of water in a seed expressed on a wet or dry basis, influencing its weight and mechanical behaviour.

Bulk density: Mass of a collection of seeds divided by the total volume they occupy, including inter-seed voids, affecting storage capacity.

True density: Mass of a seed divided by its solid volume excluding pores, reflecting material composition and porosity.

Porosity: The fraction of void space within a bulk bed of seeds, calculated from bulk and true densities, governing aeration and flow.

Angle of repose: The steepest angle at which a heap of seeds remains stable without sliding, used to assess flowability.

Discrete element method (DEM): A numerical technique that simulates the interactions and motion of individual particles to predict bulk behaviour.

Terminal velocity: The constant speed at which a seed falls through a fluid when gravitational and drag forces balance, important in pneumatic systems.

Drag coefficient: A dimensionless parameter quantifying the resistance of a seed moving through air, dependent on shape, size and surface texture.

References

1. Nondestructive Estimation of Hazelnut (Corylus avellana L.) Terminal Velocity and Drag Coefficient Based on Some Fruit Physical Properties Using Machine Learning Algorithms. Foods (2023).
2. Engineering properties of sunflower seed: Effect of dehulling and moisture content. Cogent Food & Agriculture (2016).
3. Measurements and Analysis of the Physical Properties of Cereal Seeds Depending on Their Moisture Content to Improve the Accuracy of DEM Simulation. Applied Sciences (2022).