Resource information
This study was carried out in order to obtain basic data for propelling recycling agriculture using compost derived from Samegawa Village, Fukushima. The field experiments were conducted using rice cultivar, Koshihikari in paddy field No. 1 (700 square m) and No. 2 (900 square m). Top dry weight of rice plants and nitrogen concentration of the top, and grain yield were measured. Also nitrogen mineralization rate of the soils was investigated in water-logged soil. It was obvious that not only top dry weight at maturity and grain yield but nitrogen mineralization rate were low. Although these results showed that the soil had less easily decomposable matter, the inorganic nitrogen of the soil increased to 2-3 gN/square m in 2013. Therefore, we must apply much compost every year, probably leading to increased inorganic nitrogen and improved physical properties of the soil. We should promote recycling agriculture with special consideration of the rate and timing of compost application, and the method of field control.
