Lime. Why might we need it?
Applications of fertilizers do not guarantee a healthy pasture if the pH level is too low. In low pH (acidic) conditions, plant nutrients are chemically bound and unavailable for absorption by cool season grass roots.
A soil pH of 6.2 is the ideal condition in which pasture grasses can readily absorb their much-needed nutrients. A higher pH level than 6.2 does not improve pasture yield.
Unlike fertilizers, agricultural lime does not readily dissolve to become a part of the soil chemistry. Therefore, if the recommended lime application is greater than 2 tons/acre, you can avoid waste by splitting the applications 6 to 9 months apart (unless you can disk the whole amount into the soil if you are establishing a new pasture or replanting a deteriorated field back into pasture).
Lime applications are equally effective at any time of the time of the year. However, no more than the total recommended amount should be applied over a three year period.
After three years, the soil will need to be retested.
Lime is used to correct soil pH. It is used for acidic soil conditions with a low pH. You can find out how much lime you may need by a soil test. Correcting soil pH will provide the right environment for your grazing to reach its potential and release nutrients as well as:
* Increase phosphorus and potassium availability
* Improve biological activity, thus releasing nitrogen and sulphur
* Increase earthworm activity and soil structure
* Improve the persistency and competitiveness of the productive species within the sward
* Increase calcium and magnesium supply for grass and grazers
Traditionally lime is applied in the spring, though it can be applied anytime.
Aerating and mowing before applying lime helps it permeate into the soil faster.
Lime sweetens grass and makes it more palatable.
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