Phosphorus in Finnish soils in the 1900s with particular reference to the acid ammonium acetate soil test
Comprehensive research into phosphorus (P) in soils and crops began in Finland in the early 1900s. The average amount of total P in the ploughed topsoil layer of mineral soils was about two tonnes per hectare in the 1930s, before the abundant use of fertilisers. The main chemical fractions of P in m...
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| פורמט: | Article |
| שפה: | English |
| יצא לאור: |
Scientific Agricultural Society of Finland
2008-12-01
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| סדרה: | Agricultural and Food Science |
| גישה מקוונת: | https://journal.fi/afs/article/view/5729 |