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Influence of Potassium Nutrition of Ryegrass and Soil Moisture on Denitrification
Author(s) -
Trolldenier G.
Publication year - 1979
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19791420321
Subject(s) - denitrification , potassium , rhizosphere , agronomy , chemistry , moisture , nitrogen , soil water , water content , potash , zoology , environmental chemistry , environmental science , soil science , biology , bacteria , geology , geotechnical engineering , organic chemistry , genetics
Abstract The influence of potassium nutrition on denitrification in the soil was investigated in a pot experiment with ryegrass fertilized with 15 N‐Ca(NO 3 ) 2 . After harvesting a 15 N balance was drawn up. At 70% water holding capacity of the soil 15 N was recovered completely in all 3 potassium treatments. At 90%, complete recovery was observed at the two higher K levels. At the lowest postassium level, however, only 89% of the added 15 N was recovered. The non‐recovered portion was obviously lost by denitrification. The denitrification associated with low potassium nutrition is probably due to an increased microbial activity in the rhizosphere.