New pasture guide launched to support farmers in a changing climate
A new publication has been launched that offers a comprehensive and up-to-date resource on commercially available grazing pasture species in New Zealand.
Is it worth applying nitrogen fertiliser to speed pasture recovery post drought?
A Beef + Lamb New Zealand field day in North Otago, earlier this month, heard it’s a hard question to answer.
“The issue is how long has it been dry and whether there’s enough nitrogen [in the ground] to get that initial response,” AgResearch’s David Stephens said.
If there is enough N in the ground, grass will grow 450kgDM/ha from 15mm of rain, a 30:1 response. If there isn’t, the growth from that moisture may be halved.
Fellow speaker Graham Kerr said remember nitrogen is simply a growth multiplier. “If you’re growing zero, you’ll still get zero. If you’re growing a bit, you’ll get a bit more. If it’s growing well, then you’ll get a lot more.”
Whether the response to fertiliser would be economic would “depend on how desperate [for feed] you are,” he added.
“It’s a tricky one because you don’t know how much is going to be released from the soil. It really is quite variable. In general if you’re desperate for feed you put it on because by the time you see it’s needed it’s too late.”
If nitrogen fertiliser is applied it’s imperative to wait at least three weeks, preferably four, for pasture to use it. Grazing sooner risks nitrate poisoning and curtailing the plant’s growth response.
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