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2009 Soybean Drying Tips Kenneth Hellevang, Ph.D., P.E. Professor & Extension Engineer Agricultural & Biosystems Engineering NDSU Extension Service.

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Presentation on theme: "2009 Soybean Drying Tips Kenneth Hellevang, Ph.D., P.E. Professor & Extension Engineer Agricultural & Biosystems Engineering NDSU Extension Service."— Presentation transcript:

1 2009 Soybean Drying Tips Kenneth Hellevang, Ph.D., P.E. Professor & Extension Engineer Agricultural & Biosystems Engineering NDSU Extension Service

2 Soybeans Week Ending Oct. 11, 2009 Oct. 4, 2009 Oct. 11, 2008 Average 2004-2008 Percent Dropping Leaves 98%93%100%99% Harvested17%13%57%68% USDA, NASS, ND

3 Maximum Moisture Contents for Safe Soybean Storage with Aeration Sold by Spring14% (13%) Stored up to 1 year12% Long-term Storage11% EMC @ 70ºF & 60% RH Corn12.8% Hard Wheat13.3% Soybeans10.8%

4 “Approximate” Allowable Storage Time for Cereal Grains (Days) Moisture ----- Grain Temperature (°F) ----- Content 30º40º50º60º70º80º (%)Approximate Allowable Storage Time (Days) 14****200140 15***24012570 16**2301207040 17*280130754520 18*20090503015 19*14070352010 20*905025147 2219060301583 2413040151062 26903512852 28703010742 3060255531

5 NA Drying Soybeans October 47ºF & 65% RH EMC = 12.0% cfm/buDrying Time (days) 18%1.058 1.539 2.029 16%1.050 1.534 2.025 October 15 – November 15 37ºF & 70% RH EMC = 13.7% Cfm/buDrying Time (days) 18%2.036 16%2.039 April 42°F & 71% RH, May 56°F & 63% RH

6 LT Drying Soybeans October 15 – November 15 +5ºF 42ºF & 58% RH EMC = 11.0% cfm/buDrying Time (days) 18%1.058 1.539 2.029 16%1.050 1.534 2.025 April 42°F & 71% RH, May 56°F & 63% RH

7 Fan Power Required Limit Depth 42 ft diameter bin, soybean 36 ft deep, 1.5 cfm/bu Fan = 340 hp, static pressure = 21-inches wg. Not feasible! Soybean Depth (ft) Airflow Rate 1618202224 (cfm/bu)--- hp per 1,000 bu --- 1.00.50.60.81.01.2 1.250.81.01.31.62.0 1.51.21.62.02.53.1 2.02.43.14.05.16.3

8 High Temperature Drying Soybeans  Some varieties split worse than others.  Initial moisture has no effect on splitting.  Avoid recirculating dryers.  Maximum Drying Temperature (non-food soybeans) Continuous flow130°F Batch Dryer110°F Seed110°F  Relative humidity above 40% reduces cracks.

9 Damage Occurring to Soybeans as Function of Drying Temperature Drying Temperature (ºF) Skins Cracked (%) Beans Cracked (%) 10010 – 605 – 20 13050 – 9020 – 70 16080 – 10030 - 80

10 20ºF Temperature Increase Reduces Relative Humidity to ½ (80% 40%) Soybean Seed Coat Damage and Cleavage

11 For More Information http://www.ag.ndsu.nodak.edu/abeng Google: NDSU Corn Drying

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