Authors: Harm van Rees1, Sean Mason2, Dan Bell3, Therese McBeath4, Jackie Ouzman4, Rick Llewellyn4, Craig Muir5, Michael Moodie6, Todd McDonald6
1Cropfacts, 2Agronomy Solutions, 3Landmark, 4CSIRO, 5Agrivision
Funded By: GRDC PROC 9176604
Project Title: Using soil and plant testing data to better inform nutrient management
Peer Review: Michael Moodie (MSF, Frontier Farming)
Key Words: Soil P, Available soil N, nutrient variability, P and N fertiliser response, Precision Agriculture
- Soil P and N status are highly variable across paddocks. Depending on variability, soil sampling intensity should be increased to sample more than one zone in a paddock.
- Low production zones tended to have lower soil P and higher soil N levels, suggesting that nutrient inputs might require adjustment to improve profitability.
- In 2019 the yield response in the Mallee to P fertiliser was highly variable across the paddock and was closely correlated to soil P status (Colwell with inclusion of PBI interpretation /DGT – proviso, only one paddock had been analysed at the time of writing).