Pasture Trials

67 trials nationwide have been conducted on a mixture of dryland and irrigated clover based pasture, making it the largest nitrogen response study on pasture in New Zealand since 1981.

The trial periods ranged from 15 to 187 days with the average length of most trials being 25 days.

Over 100,000 individual pasture measurements were taken. Of the trials conducted, seven trials did not show a nitrogen response to urea application,
seven were not conducted in accordance with Donaghys recommendations (i.e. off-label) and another seven did not include a treatment with 40kg/ha of urea.

extended pasture trials

Nine extended trials were conducted past one grazing round (average of 49 days) to assess the residual effect of N-Boost®. Five of these trials were independent and four were in-house.

ONE TRIAL WAS ALSO CONDUCTED THROUGHOUT AN ENTIRE MILKING SEASON (SEVEN GRAZING ROTATIONS)

Treatments were reapplied before grazing three and grazing six. Using 120kgs less urea, the N Boost® treatment grew similar amounts of pasture to the 80kg spread urea treatment.

variability of nitrogen fertiliser response

Applying urea alone will have variable results on pasture response due to external factors such as soil temperature, moisture and existing soil nitrogen.

Using the N-Boost® System will also have variable results on pasture response but trial results show that the N-Boost® System will still double the pasture response to 40kg of urea per hectare.

* Nitrogen Fertiliser Trial Database: A Valuable Resource. Climatic Factors and First Cut Response to Nitrogen Application. In: Nutrient management in a rapidly changing world. (Eds L.D. Currie & C.L. Lindsay), pp. 191-204. Fertiliser and Lime Research Centre, Massey University, Palmerston North, NZ.

UREA AND THE N-BOOST® SYSTEM HAVE SIMILAR VARIABILITY

Using the N-Boost® System will also have variable results on pasture response but trial results show that the N-Boost® System will still double the pasture response to 40kg of urea per hectare.

N-Boost® should only be used when a nitrogen response can be expected. Soil temperatures must be 10°C or above. Ensure sufficient pasture cover for optimum foliar uptake (1400-1600kg DM/ha). For best results apply the N-Boost® System 3-5 days after grazing. Sufficient soil moisture content is required for pasture to respond. Avoid application in very hot or windy conditions or within 6 hours of impending heavy rain.