山形県庄内地域の水田土壌(グライ土壌)の可分解性有機態窒素と水稲の収量構成要素の関係について

概要

論文の詳細を見る
Relationship between yield components of rice plant and mineralization potential (N_0) of paddy soil was evaluated. The mineralization potential was obtained using sulfic acid extraction method. Furthermore, map of N_0 was made. The mean value of N_0 of topsoil was 14.4 mg/100g soil, which ranged from 8.7 to 21.6 mg/100g soil. On the other hand, that of subsoil was 5.7 mg/100g soil. and ranged from 2.5 to 14.8 mg/100g soil. It was found that yield of rice plant increased with increase in N_0 of topsoil and subsoil of paddy field. There was correlation (r=0.684***) between N_0 of subsoil of paddy soil and percentage of bearing tillers among the fields which had same number of maximum tillers. The number of grains per panicle was highly correlated with total amount of N_0 from topsoil and subsoil of paddy field in which the panicle number was almost the same. According to difference in N_0 of topsoil and subsoil of paddy fields, map of N_0 was made. The map of N_0 was appropriate in comparison with map of yield of rice plant in Shonai district.
1992-02-05