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Illinois Soil Nitrogen Test Measures Microbial Nitrogen
Illinois Soil Nitrogen Test Microbial Nitrogen
2009/12/16
The Illinois Soil Nitrogen Test (ISNT) was developed for this purpose, and involves estimation of gaseous ammonia liberated by heating the soil with strong alkali in a Mason jar. Several studies have ...
Finnish trends in phosphorus balances and soil test phosphorus
phosphorus P balance soil test P farm type P fertilization, Agri-Environmental Programs
2010/8/9
Soil test phosphorus (P) concentration has a major influence on the dissolved P concentration in runoff from agricultural soils. Thus, trends in soil test P partly determine the development of polluti...
Effects of repeated phosphorus fertilisation on field crops in Finland 1.Yield responses on clay and loam soils relation to soil test P values
Acid ammonium acetate method optimal soil test P soil acidity soil phosphorus
2010/8/10
In order to update phosphorus (P) fertiliser recommendations for the Finnish clay and loam soils enriched with applied P, the effects of repeated P fertilisation on the yields of cereal and other crop...
A rainfall simulation study on the relationships between soil test P versus dissolved and potentially bioavailable particulate phosphorus forms in runoff
phosphorus bioavailability erosion rainfall simulation
2010/8/11
Runoff from clayey soils often contains abundant particulate phoshorus (PP), part of which may solubilize in surface waters. Monitoring losses of potentially bioavailable forms of PP is expensive, cal...
Phosphorus status of diverse soils in Finland as influenced by long-term P fertilisation 2.Changes of soil test values in relation to P balance with references to incorporation depth of residual and freshly applied P
Acetate extractable P Olsen P sampling depth total P water extractable P
2010/8/13
Fertilising with phosphorus (P) ensures continuous supply of an essential growth factor as necessary for productive and sustainable agriculture. The amounts of P required to attain and maintain an ade...
Phosphorus in Finnish soils in the 1900s with particular reference to the acid ammonium acetate soil test
acid soils bioavailability chemical fractions old soil samples total phosphorus
2010/8/16
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...