IngentaConnect Stationary drying of soybean seed using drying air of different r...

Authors: Levien, A.; Baudet, L.; Peske, S.

Source: Seed Science and Technology, Volume 36, Number 1, April 2008 , pp. 148-156(9)

Publisher: International Seed Testing Association

Abstract:

The objective of this study was to improve bin drying of soybean seed by varying Relative Humidity (RH) of the air flow using a stationary dryer with radial distribution of air. Four batches of eight tons each were dried: two with high RH initially (45%) followed by low RH (30%) and two with low RH initially (30%) and then 45% RH at the end of drying, which was the innovate approach. The rate of air flow was 30 m³/minute/ton. During drying, seed samples were taken from the dryer at 0.15; 0.30 and 0.45 m from the perforated central pipe and at 0.90; 2.70 and 4.50 m height from the dryer floor. Samples were evaluated for seed quality through standard germination, tetrazolium - viability and vigor, accelerating aging and field emergence. Results showed that the average stationary bin drying rate of soybean seeds was close to 0.80 percentage points (p.p.)/hour using low RH initially followed by high RH at the end of drying; using the high RH at the end of drying approach, the seed moisture gradient all over the dryer was below 2%; increasing 15 p.p. in RH at the end of stationary drying reduced average drying rate by about 20%; and soybean seed quality was not adversely affected by increasing the RH at the end of drying.

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Stationary drying of soybean seed using drying air of different relative humidities