Nitrogen and organic matter of volcanic ash soils of Santa Bárbara Association in Chile

Evaluation of soil nitrogen status in japanese agricultural lands with reference to land use and soil types

“…Bernardi et al 1973;Nishita and Haug 1973;Gotoh and Koga 1983;Aggarwal et al 1987;Paramasivam and Breitenbeck 1994). However it should be noted that the Iex-N content exceeded 100 mg kg-I in some upland soils for vegetable production, probably due to intensive fertilizer application before sampling.…”

The pH of Chilean volcanic ash soils “trumaos”

“…83 and 84 should be of different nature from those of other soils. Concerning the properties of the humic matter of the soils, BERNARDI et al (5) revealed that the humic acid of these soils was in a more advanced stage of humification as compared with the humic acid of other soils. It would mean that the humic acid of these soils is abundant Fhr.…”