Extensive trials in conjunction with Massey University Fertiliser & Lime Research Centre were completed at Winton and Browns in Southland. Three lime particle sizes were applied and compared to a control block, this series being replicated four times and arranged in a randomised block design.

During the twenty two month trial five batches of analysis were undertaken on each individual block. These field trials established the effects of different particle sizes when applied at a rate of 2 tonnes per hectare on dry matter yield, and soil pH and soil calcium levels.

Soil pH

Effect of different particle size fractions on soil pH All lime sizes significantly increased soil pH to optimum levels in comparison to the control block where no lime was applied. The <0.25mm particle size lime raised soil pH and soil exchangeable calcium levels within 35 days*, a quick response, Ag Lime 90 contains 40% of this particle size range. Pasture production is increased the sooner lime is absorbed. *Further trial work has been done on this size fraction Particles 0.25-1mm increased soil pH to greater that 5.8 in less than 83 days and between 83 and less than 320 days for the largest particles 1-2mm. These pH levels remained constant for the duration of the trial work.

Estimated effect of AgLime 90 on soil pH AgLime 90 is estimated to have increased soil pH levels to above 5.9. pH levels were maintained between 5.9 and 6.1 throughout the trial period

Dry Matter Yield

Estimated effect of AgLime 90 on pasture dry matter yield The cumulative dry matter yield is estimated to increase significantly over application periods. AgLime 90 has the potential to increase dry matter accumulation by 2000 kg of dry matter per hectare, approximately 18%, compared to the effect of no lime over a twenty two month period.

Benefits

AgLime 90 consistently tests between 88% and 95% calcium carbonate (CaCO3), the best quality lime in Southland.

AgLime 90 has a combination of particle sizes. The majority are fine (40% <0.25mm) and so dissolve within 35 days, are readily absorbed and increase the soil pH and soil exchangeable calcium levels. The larger particles within Ag Lime 90 enable sustained dissolution over longer periods.

AgLime 90 improves pasture production leading to healthy livestock with good bone structure. AgLime 90 generates the right conditions for increased activity of micro organisms and earthworms to break down and aerate the soil to improve soil structure. The release of beneficial elements contained within the soil is improved, while harmful elements availability is decreased. Increased acidity due to nitrogen based fertilisers and wet weather, is countered by the application of
AgLime 90.

The trials show an increase in dry matter production of 18% or 2000kg, which resulted from the application of AgLime 90 at 2000kg per hectare. The benefits from such an application are expected to continue for two years and have an average on ground application cost of around $90.00 per hectare.

For a dairying operation, the increased pasture produced and consumed would relate to an increase of 105kg milk solids per hectare (feed conversion rate of 19:1 used). At $3.50 per kg of milk solids this equates to a net benefit* of $277.00 per hectare over a two year period.

For a sheep and beef operation increased pasture produced and consumed would relate to an increase of 200kg meat liveweight per hectare (feed conversion rate of 10:1). AT $1.00 per kg liveweight this equates to a net benefit* of $110.00 per hectare over a two year period. At $2.00 per kg liveweight this equates to a net benefit* of $310.00 per hectare over a two year period.

* This is with purchase and transport costs deducted.

Summary

A smart investment in applying AgLime 90 can produce real results. Soil pH and exchangeable calcium are increased to levels considered optimum for pasture production. Premium pastures, increased dry matter yield provides you with strong, healthy livestock and increase your returns.