藁立ての防風効果について

抄録

To protect the crops from the wind damage, farmer often put up the straw fence in farm field. Author investigated the effect for varing the fence condition (See Fig. 1) in farm field.
Main results are as follows:—
1. effect of protection against wind.
Fig. 2 shows the variation of wind speed difference between A plot(no fence)and B plot(ordinary fence) or C plot (surrounded, by fence), with increasing of the wind speed at A plot.
The variation curves are more conspicous in the difference between C and A, and more greater in night than in day time. This implies the effect of protection against wind in night is much larger than in day time.
2. Prevention of dust.
To measure the removment of dust in these plots, we used the aluminium dishes 7cm in diameter, 2cm in depth) are poured water about half of it to prevent jumping out of the dust by wind.
The water are took off by drier. Results of this are shown in Tab. 3, 4 and Fig. 3.