Bulletin of The Iwate Agricultural Research Center No.9
Summary

Effect of Continuous Application of Organic Materials on Non-allophanic Andosol
Hisakazu HAGAMI, Yoshinori TAKAHASHI, Takashi SATOH, Ayumi NAKANO, Chiaki SATOH, Rumiko KODASHIMA, Haruo SHINKE, Tsuyoshi ONO and Katsuro TADA
@Research was conducted involving applying manure to upland fields with non-allophanic andosols at the Iwate Agricultural Research Center. Mixed manure (containing cow, pig, and chicken manure) has been applied to fields for 10 years, while pig manure and chicken manure have been applied for 5 years. Through this study, we clarified the effects that continuous application of manure, as well as the use of different kinds of manure, had on productivity of crops and on properties of the soil.

@Furthermore, we examined appropriate applications for manure. Yields increased with a continuous application of mixed manure together with chemical fertilizer. In particular, high yields were achieved by applying 40Mg and 80Mgha-1 manure. Chemical properties of the soil showed an increase in exchangeable cations and available phosphoric acid. The application of 40Mg and 80Mgha-1 manure was also determined to be effective in controlling the fall of pH levels and to have a positive effect on the subsoil. These results suggest that the application of 40Mg and 80Mgha-1 manure together with chemical fertilizer is effective.

@However, a continuous application of manure resulted in an accumulation of exchangeable potassium and available phosphoric acid. In such a case, it is necessary to prevent excessive accumulation of nutrients by reducing the amount of chemical fertilizer. Yields also rose when only pig or chicken manure was used; pig or chicken manure can be effective as an alternative to chemical fertilizer. Furthermore, these manures were effective as soil amendments, chemical properties of the soil showed an increase in exchangeable cations and available phosphoric acid. The application of pig manure and chicken manure was also determined to be effective in controlling the fall of the pH levels. These results suggest that the continuous application of pig manure and chicken manure is effective. However, through continuous application, exchangeable cations and available phosphoric acid tended to accumulate. In such a case, it is necessary to prevent excessive accumulation of nutrients by reducing the amount of applications of manure.
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