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North Canterbury News: September 12, 2019

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Four options in pasture renewal<br />

There are four main waystorenew<br />

pasture: cultivation, spray­drilling,<br />

undersowing, and oversowing.<br />

Sprayand drill<br />

Adirect­drillisused to sow treatedseed<br />

into an uncultivatedpaddock after<br />

existing pasture is killed by herbicide.<br />

Advantages:<br />

Herbicide controls competition;<br />

Less expensive andless timeconsuming<br />

than cultivation;<br />

Quickertofirst grazing (sixweeks);<br />

White clover establishment is possible<br />

(see below);<br />

Long­term solution.<br />

Disadvantages:<br />

Lessopportunity to correctpH;<br />

Won’t fix soil compactionorlevel the<br />

paddock;<br />

May revert to old pasture morequickly<br />

than cultivated paddocks;<br />

Two drill passes at half the seeding rate<br />

are desirable to achievedense pasture;<br />

Lossofpastureproduction after<br />

spraying.<br />

White cloverestablishment(after spraying<br />

to kill existing pasture):<br />

Drill ryegrassusingthe main­seed box.<br />

Drop white clover seedontothe soil<br />

surfacefrom the small seeds box in front<br />

of coulters sowing the ryegrass.<br />

Cover seed with abrush or bar harrow.<br />

Sowing ryegrass and white clover seed<br />

throughthe samecoulterresults in poor<br />

white clover establishmentbecause the<br />

clover is drilled too deep (1cm­2cm is<br />

suitable for ryegrass but notclover), and<br />

clover seedlings are forced to compete<br />

with more vigorous ryegrass seedlings<br />

growinginthe samedrill row.<br />

Cultivation<br />

This involves breaking up the soilprior<br />

to sowing with the likesofaplough,power<br />

harrow,discs or rotocrumbler.<br />

It is necessary where there is aneed to<br />

eliminate compactionorlevelling, or lime<br />

incorporation is required.<br />

Advantages:<br />

Mostconsistent results;<br />

Fresh start ... Spray and drill is acommon<br />

pasture renewal method for an uncultivated<br />

paddock.<br />

Eliminates compaction;<br />

Best pest and weed control;<br />

Can level apaddock;<br />

Can incorporate lime;<br />

Allowsgood soil coveragebyseed;<br />

Disadvantages:<br />

Most expensive method;<br />

Slowertofirst grazing (sixto10weeks);<br />

Softerand more prone to pugging<br />

during establishment.<br />

Undersowing<br />

Use adirect­drilltosow treatedseed<br />

into existing pasture.<br />

It works verywell in the narrow window<br />

of time when apasture has thinned out but<br />

has not yet beenovertakenbyweed<br />

ingression.<br />

Use this method after extended dry<br />

conditions wherelarge areas needtobe<br />

sown,orafter winter puggingdamage.<br />

Resultsare variablewhere it is used in<br />

pasturestoo dense for the new seedlings to<br />

establish well.<br />

Advantages:<br />

Cheap and simple;<br />

Allowslargeareastobedone;<br />

Italian or hybridcan boost winter/early<br />

spring growth.<br />

Disadvantages:<br />

Doesn’t work in densepastures;<br />

Doesn’t control problemweeds;<br />

Not suitable for whiteclover<br />

establishment;<br />

Usually only atemporary fix.<br />

Amuri Spraying Ltd<br />

Forall your Progibb, Liquid urea and General<br />

spraying requirements.<br />

Oversowing<br />

Treatedseed is broadcast on to the<br />

surfaceofthe soil.<br />

Generally usedtorepair smallerareas,<br />

for example,after pugging damage, or to<br />

establishwhite clover in springinto<br />

pastures wherethe land is too steep or<br />

stony for cultivation.<br />

Not recommended forimprovement of<br />

lowland pastures due to high seeding<br />

mortality.<br />

Sowingrates are generally higher, as<br />

establishment rates of seed placed on the<br />

groundsurface are lower.<br />

Advantages:<br />

Can introducelegumes and nitrogen<br />

fixation;<br />

Can apply with fertiliser;<br />

Disadvantages:<br />

Variable results.<br />

Hardtocontrol competition.<br />

Ph: 0800 888 308<br />

Amuri<br />

Helicopters<br />

info@amurihelicopters.co.nz<br />

www.amurihelicopters.co.nz<br />

Proudly supporting the conservation of our local environment.<br />

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RURAL LIFE —SPRAYING<br />

<strong>North</strong> <strong>Canterbury</strong> <strong>News</strong>, <strong>September</strong> <strong>12</strong>, <strong>2019</strong><br />

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