Proporcje Ca:Mg jeszcze raz

Jezus napisał(a):Chyba odpieniacze białek w solniczkach dzięki temu działają

Balances and Ratios:
For many years, there have been a few people who claim that there is an "Ideal"
ratio of the three principal soil cation nutrients (K, Ca, and Mg). This concept
probably originated from New Jersey work by Bear in 1945 that projected an
ideal soil as one that had the following saturations of exchangeable cations 65%
Ca, 10% Mg, 5% K, and 20% H. The cation ratios resulting from these idealizes
concentrations are a Ca:Mg of 6.5:1, Ca:K of 13:1, and Mg:K of 2:1. It is generally
accepted that there are some preferred general relationships and balances
between soil nutrients. There is also a significant amount of work indicating
that excesses and shortages of some nutrients will affect the uptake of other nutrients.
However, no reliable research has indicated that there is any particular
soil ratio of nutrients. There is even less research done with respect to rice and
certainly few studies done on growth of many of the species kept in the aquarium
plant hobby. Over the years, a significant amount of conversation revolved
around the concept of the ideal Ca:Mg ratio. Most of the claims for the ideal
ratio range between 3-4:1 in aquariums and 5-8:1 in agriculture. Research indicates
that plant yield or quality is not appreciably affected over a wide range of
Ca:Mg ratios in the soil (Barber, 1995). This appears to be the case for aquatic
plants as well. Wisconsin research found that yields of corn and alfalfa were not
significantly affected by Ca:Mg ratios ranging from 2.3:1 to 8.4:1 in all cases,
when neither nutrient was deficient, the crops internal Ca:Mg ratio was maintained
within a relatively narrow range consistent with the needs of the plant.
These findings are supported by most other authorities. A soil with the previously
listed ratios would most likely be fertile. However, this does not mean
that a fertile soil requires these specific values (or any other). Adequate plant
nutrition is dependent on many factors other than a specific ratio of nutrients. It
is rare that any gain in growth is achieved by adjusting this ratio, rather, the
base line concentration in terms of limitation is the real determinant. This concept
is much less specific than claiming that there is a value to a specific numerical
ratio.