Low-Rate Annual Lime Applications Improve Pastures?
of Crop and Soil Sciences
recommendations for lime application are to spread 2 to
10 tons per acre of lime, incorporate the lime with some
form of tillage, and then plant the crop.†
There are some situations such as permanent pastures
and hay fields, where a lime application could be beneficial
but producers donít want to till and reseed.†
Other places in the world, notably New Zealand,
pastures and hayfields are maintained by regular application
of lime and other fertilizers for years without reseeding.†
Jane Jewett, a former graduate student at University
of Minnesota, asked the question.† Could this approach work in the U.S.?
made applications rates of 500, 1000, and 1500 lbs/acre
of agricultural limestone equivalent.†
Applications were done in two consecutive years,
1997 and 1998.
applications shifted the species composition from 8% legumes
and 60% grass to about 63% legumes and 28% grass.†
The crude protein of the forage increased along
with the increase in legumes.
pH stayed constant at 5.1 and 5.2 in the untreated strips.† All strips treated with liming materials showed
a trend toward increased soil pH.
was a trend toward increased yield on lime-treated strips.† Untreated strips averaged 4.1-tons/acre yields
over two years.† The
average 2-year yield for strips limed at the 1000 lbs/acre
rate was 5.2 tons/acre.
Grimsbo Jewett concluded: