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Making better use of N, P and K

The chemical advantages of a finely ground lime are widely understood - in terms of the efficiency and the speed of dissolution into the soil profile. However, using the finely ground product in a granulated form such as Granucal offers the user additional physical benefits.

Granucal enables much more even and accurate spreading without losing the most valuable fraction as wind-blown dust. Another advantage is that the farmer can use his own spreader and equipment and can purchase lime in tote bags, rather than bulk loads, thereby enabling immediate application as required – without having to undergo the expense of hiring a specialised contractor.

Smaller and more regular applications will even out the pH peaks and troughs associated with irregular liming several years apart.  This increases the efficiency of nitrogen uptake and enables better control of other nutrients which are affected by soil pH. 

The table below indicates how pH impacts on the availability of the most common fertilizers:

Availability of fertilizers at different pH levels

Fertilizer

pH 4.5

pH 5.0

pH 5.5

pH 6.0

pH 7.0

Nitrogen

30%

43%

77%

89%

100%

Phosphate

23%

31%

48%

52%

100%

Potash

33%

52%

77%

100%

100%

 (Source MEAC France)

As well as the cost of lost fertiliser, a low soil pH can have quite a severe impact on silage yields with reductions of up to 20% (a sign of this is wet, structureless, squashy silage), and can also negatively impact on milk yield.

Liming with Granucal leads to a more efficient use of inputs and a more effective farming environment.  As Granucal is low magnesium, it is also sufficiently flexible for use at very low rates to counteract natural soil acidification, even when Nitrogen application rates are low or nil.

For more details on Granucal contact Morton’s on 02840662521


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