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Recommended Drying Temperature, Air Flow, Seed Depths

When heated air is used for drying, there can be large differences in degree of drying between the layer of seed near the air inlet and top layers. To minimise this difference and to avoid extensive over drying of the bottom layers before the top layers are dry, it is necessary to dry seed at shallow depths in heated air drying. Table gives the recommended maximum seed depths for batch drying in a bin. If the seed is to be stored in the bin where dried , the seed depth could be approximately double that shown in table since, in storage , drying is usually done at lower temperatures than in batch drying.

Recommended Temperatures and Depths for Heated Air Drying of Various Crop Seed in Bins:

Sr.No

Seed

Maximum Depth

Recommended Drying Temperature

1

Shelled corn

20"

110 0F

2

Wheat

20"

110 0F

3

Barley

20"

105 0F

4

Oats

36"

110 0F

5

Rice

18"

110 0F

6

Soybeans

20"

110 0F

7

Peanuts

60"

90 0F

8

Grain Sorghum

20"

110 0F

Heated Air Drying Requires Higher Rates of Air Flow for Two Reasons:

1. Water is evaporated faster and more air is needed to carry it away, and
2. The higher the rate of air flow, the more uniformly there is in the drying of upper and lower layers of seed. Moreover, drying proceeds considerably faster at recommended temperatures at higher rates of air flow. Sometimes the drying time can be halved by doubling the air flow.

Current Category » Principles of Seed Technology