Property and Fertilizing Effect of Phosphorus in Incinerated Biomass for Komatsuna (Brassica campestris var. peruviridis)

The property and effects of phosphorus in incinerated biomass as fertilizer were evaluated. Incinerated poultry manure contained 27.23% phosphate, and incinerated cattle manure contained 7.93% phosphate. Most of the phosphate in incinerated manure, 92.2% of the phosphate in incinerated poultry manure, and 99.3% of the phosphate in cattle manure was citrate soluble. On the other hand, hardly any water-soluble phosphate was contained in incinerated biomass. As a result, most of the phosphate in incinerated biomass is considered to be available phosphate. Komatsuna (Brassica campestris var. peruviridis) was cultivated in pots supplied with incinerated biomass or chemical fertilizer consisting of fused magnesium phosphate. The plant growth in the pots supplied with incinerated biomass was almost equivalent to or greater than that with fused magnesium phosphate. In the field experiments with komatsuna, there was no significant difference in growth, yield or fertilizer effect between the plants fertilized with incinerated biomass and those fertilized with magnesium phosphate. Thus, incinerated biomass was considered to be suitable substitute for phosphate fertilizer.