HYDROLYZABLE ORGANIC FORMS OF NITROGEN IN SOME RICE SOIL PROFILES AS AFFECTED BY ORGANIC MATTER APPLICATION

スポンサーリンク

概要

• 論文の詳細を見る

• The influence of previous application of organic matter for a period of 16 years on the amounts and distribution of organic N was investigated using profile samples from four rice field plots. This study was conducted by determining soil horizon samples for nonhydrolyzable N and hydrolyzable (total, ammonium, amino sugar, and unidentified) N with the hot 6 N HCl hydrolysis procedure. Organic matter treatments, including the application of rice compost, rice straw, and Italian ryegrass residues, led to a marked increase in all forms of soil N whose content was highest in the surface soil and decreased down the profile. The proportion of hydrolyzable N(40-81%) to the total N decreased with depth and that of nonhydrolyzable N(19-60%) increased with depth. Furthermore, the proportion of amino acid N(4-28%), amino sugar N(2-5%), and unidentified N (12-32%) decreased with depth, whereas that of hydrolyzable ammonium N(16-24%) remained fairly constant throughout the profile. In general, the profile distribution pattern indicated no differences regarding the proportion of each organic N fraction, so that organic matter application appeared to have little effect on these parameters. In spite of the considerable differences observed in the amino acid content, the amino acid composition of all horizon samples in the profile was remarkably similar independently of the depth as well as the treatments. Neutral amino acids were present in very large amounts followed by acidic and basic amino acids with a rough ratio of 6.5: 2.5 : 1.0. Moreover, the amino acid compositional pattern in the soil was closely consistent with that obtained from the organic residues used for soil application. In the linear correlation analysis, mineralizable N derived from anaerobic incubation method was found to be significantly correlated with all the N fractions including even nonhydrolyzable N. Stepwise regression analysis indicated, however, that there were no differences in terms of the relative contribution from each soil N fraction. Presumably, the degradation of the soil N compounds by the chemical treatment resulted in a pattern not closely related to the biological mineralization of soil N.

• 社団法人日本土壌肥料学会の論文

著者

• Koga H

  Soils And Plant Nutrition Division Kyushu National Agricultural Experiment Station

• GOTOH Shigeyoshi

  Soils and Plant Nutrition Division, Kyushu National Agricultural Experiment Station

• ARARAGI Michio

  Soils and Plant Nutrition Division, Kyushu National Agricultural Experiment Station

• KOGA Hiroshi

  Soils and Plant Nutrition Division, Kyushu National Agricultural Experiment Station

• ONO Shin-ichi

  Soils and Plant Nutrition Division, Kyushu National Agricultural Experiment Station

• Gotoh S

  Soils And Plant Nutrition Division Kyushu National Agricultural Experiment Station

• Araragi Michio

  Soils And Plant Nutrition Division Kyushu National Agricultural Experiment Station

• Ono Shin-ichi

  Soils And Plant Nutrition Division Kyushu National Agricultural Experiment Station

• KOGA HIROSHI

  Department of Epidemiology and Public Health, Tokyo Dental College

関連論文

• EFFECT OF LONG-TERM APPLICATION OF ORGANIC RESIDUES ON THE DISTRIBUTION OF ORGANIC MATTER AND NITROGEN IN SOME RICE SOIL PROFILES
• Comparison of short-term in vitro fluoride release and recharge from four different types of pit-and-fissure sealants
• Fluoride release from newly developed dental adhesives
• HYDROLYZABLE ORGANIC FORMS OF NITROGEN IN SOME RICE SOIL PROFILES AS AFFECTED BY ORGANIC MATTER APPLICATION

スポンサーリンク