Wind-proof Seedbed for Reducing Wind Damage at Early Germination Stage of Direct Sowing Sugar Beet

ICHIKI Hideyuki, Van Nang NGUYEN, YOSHINAGA Keita, MIYAZAKI Masahiro, UEKA Yuko

doi:10.11357/jsam.75.89

Seedlings of direct sowing sugar beet cultivation are vulnerable to wind injury in the early stage of germination. Seedbeds prepared to shelter the young seedlings from strong wind are a possible wind-damage countermeasure. In the present study, effect of a wind-proof seedbed that has Λ-shaped ridges at both sides of the sowing position on wind proofing was examined by wind tunnel tests. Measurements were made of vertical wind velocity profile using hot-wire method, and of wind velocity vector using particle image velocimetry (PIV) technique in the vicinity of a wind-proof seedbed model. Wind flow characteristics above the seedbed were also modeled and simulated by Computational Fluid Dynamics (CFD) modeling. Based on the measured and simulated data, a seeder-mounted ridger was developed which can form the wind-proof seedbed with the Λ-shaped ridges with height of 5 cm. Field tests were conducted to measure and compare the wind velocity at different heights above the sowing position of the wind-proof seedbeds and conventional seedbeds. Test results showed that the wind velocity at an elevation of 1 cm above the sowing position of the wind-proof seedbed was reduced by 60 % in comparison with that of the conventional seedbed.

Wind-proof Seedbed for Reducing Wind Damage at Early Germination Stage of Direct Sowing Sugar Beet

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