As a result of applying the organic matter prepared by the composting of sludge due to aerobic fermentation to rice plants of a paddy field and performing planting earlier by about one month as compared with the conventional cultivation due to application of inorganic chemical fertilizer, the yield is markedly increased. Especially, the injury due to the generation of hydrogen sulfide in the soil of a paddy field during the young ear forming period is suppressed, by charging phototrophic bacteria. The yield was increased by 200% or more as compared with the conventional example.

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For 32 days from late autumn to early winter 1990, It has been sprayed a humus solution containing oak defoliant over a road in 7 -Chome, Nishi, Chuo-ku, Hokkaido. The spraying width was approximately 2.5 meters, starting from along the road's shoulder. The amount of airborne dust after spraying was investigated the drying conditions of the sprayed road surface, and the physical and chemical properties of dust accumulated on the road. These results were compared to those obtained in a zone sprayed with tap water (unsprayed zone) .
1) The concentration of airborne dust in the test zone (sprayed zone) before the performance of spraying was about twice that in the unsprayed zone. However, the concentration of airborne dust in the sprayed zone during the autumn-to-winter spraying period was half that in the unsprayed zone.
2) The sprayed road surface dried from the spraying boundary toward the shoulder, while the unsprayed road surface dried in patches throughout the sprayed area. However, complete drying in the sprayed zone took about one hour longer than in unsprayed zone.
3) The dust accumulated on the road, in the sprayed zone had more carbon, protein, glucose, ultraviolet ray absorbance, and cation exchange capacity than in unsprayed zone.
Infrared absorbance analysis revealed that the adsorption of oil (approx. 3, 000cm^-1) for each particle size of the dust in the sprayed zone was decreased. This reduction in absorbance peak was most prominent in finer particles (less than 63 microns) .
The above study shows that the spraying of a humus solution over roads contributes to a reduction in airborne dust, the prevention of dust clouds from swirling up from the road, the increase of humus and moisture concentrations and cation exchange capacity in road dust, and the decrease of oil content.

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