土壌有機燐の作物による利用に関する研究(第2報) : 土壌有機燐の無機化について

概要

論文の詳細を見る
To investigate the availability of soil orgnnic phosphorus to plants, mineralization of organic phosphorus in soil was estimated by the incubation experiment and also by the use of rice bran enzyme. The results may be summarized as follows : 1. Mineralization of soil organic phosphorus was determined both in upland and paddy conditions; amount of mineralized phosphorus was higher in the latter and was increased by such treatments, as pre-drying of soil, raising the temperature and adding oxalate to soil (Table 2). 2. Soils were added with phytin and nucleic acid, 25〜50 mg P per 100 g of soil, and were incubated at 40℃ for 14 days; mineralization of added organic phosphorus amounted to 5〜9% in the former and 55〜75% in the latter (Table 3). 3. 2% NaOH and 4% NH_4OH extracts of soil organic phosphorus were incubated or treated with rice bran phosphatase. Rates of mineralization amounted to 4〜10% in case of NISHIGAHARA soil extract and 11〜17% in KONOSU soil extract. (Table 4) 4. Phytin was more stabl than Nucleic acid to dephosphorylation, when added to 2% NaOH extracts of soil and incubated or hydrolyzed by enzyme (Table 5). This stability of phytin is probably due to its being combinated with Fe or Al which were found in the alkaline extracts of soil (Table 6).
社団法人日本土壌肥料学会の論文
1955-09-05