Stubble Components Demonstration

The demonstration was established to test whether increased N rates influence the quality (nitrogen content) of the stubble produced.

Scout wheat was sown on May 4th with 125 kg/ha DAP. Soil N (0-60 cm) was 74 kg N/ha. The demonstration was topdressed on August 2nd and again on August 20th at various rates. Crop samples were taken just prior to harvest to test for harvest index (the proportion of grain to total biomass). Grain yield data was collected and stubble tested for nitrogen content.

Results

Topdressing strategy, yield, grain protein, stubble N content (not replicated) and harvest index (replicated data)

icc 2017 ct1

What does it mean?

The higher the rate of N at the second topdressing resulted in higher stubble N (r2 = 0.81), but overall the N content of the stubble was low. Total N topdressed had a weak relationship with stubble N content (r2 = 0.34).

The higher the total amount of topdressed urea resulted in a higher Harvest Index (r2 = 0.84).

Overall the Harvest Index (HI) was higher than expected for the irrigated crop compared with dryland crops were the HI is approximately 0.4.

Advertisements

About BCG

Birchip Cropping Group Inc. (BCG) is a not-for-profit agricultural research and extension organisation led by farmers in the Victorian Wimmera and Mallee.
This entry was posted in No category. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s