Dairy farmers John and Colleen Campbell depend on Altum for fertiliser advice, and they are very pleased with the results.
They run 850 cows on medium-light volcanic ash soils on the Rangitikei Plains near Whakatane in the Bay of Plenty, and strive each year to have enough feed on hand to last the dry summer months.
In 2007 they switched from standard urea to StrategeN and SustaiN, and soon built up a strong working relationship with Altum consultants.
'We had been moderately happy with N fertiliser, but we have had excellent results since switching to Altum,' says John.
'We are getting good back-up from their technical team - we weren't getting that level of expertise in the past. I now rely heavily on their fert advice.'
The Campbells farm a 245-ha milking platform, with another 100 ha of support land for the young stock. The land is always short of sulphur.
John says the farm's Achilles heel is its dry summers, and he has to try to get grass in beforehand.
'I have to push production early in the season and have it in the bank by Christmas time.
'What they said will work for me has worked for me. They came along in June and suggested I use PhaSed N, and I followed this up with another dressing in late August.
'It hasn't been an easy winter, but we have now got grass on hand. I'm no scientist, but I've got to say that PhaSed N works.
'I'm getting longer out of it - it's growing grass for longer periods than straight urea.'