Riverine Plains Inc managed the GRDC investment Southern NSW Trials – Optimising crop nutrition in canola project from 2017-2018
The project was designed in response to farmers in southern NSW who have been questioning the accepted requirements of in-season sulphur (S) in canola.
Traditionally, up to 20-24kg S/ha is applied prior to, or onto a canola crop. However, given canola-wheat is now a key cropping rotation and many paddocks have good history of S application, and there is also evidence of S accumulation at depth, growers have been questioning if that amount is actually required for each canola crop.
As part of the project, two field trials were conducted at Howlong and Yarrawonga during 2017 and at Howlong and Coreen during 2018. The trials aimed to generate local information about the interactions between nitrogen supply and sulphur uptake, to ensure sulphur uptake is not inhibited by sub-optimal nitrogen levels. and to provide an economic analyses of the response.
Field Trials – Howlong & Coreen, NSW 2018
Replicated trials were sown at Howlong and Coreen during 2018 involving different combinations of nitrogen and sulphur treatments. The sulphur treatments were: 0, 10, 20, 30, 40 kg S/ha (applied as ammonium sulphate, while nitrogen was applied at 0, 40, 80, 160 or 240 kg N/ha (as urea).
Soil sampling, dry matter (DM) sampling, tissue analysis, NDVI and harvest yield data was collected for plots at, enabling gross margin analysis to be undertaken for both 2017 and 2018.
Results from 2018
Two years of results from this project were published in Research for the Riverine Plains, 2019 and are available here: Optimising crop nutrition in canola, 2019
Please note that the 2019 report contains an amendment to the data and analyses previously published in Research for the Riverine Plains, 2018.