CottonInfo nitrogen management trials: Gwydir

Alice Devlin - The findings of the Trials conducted by CottonInfo

Farm Table says:

The results collected in this trial were also used in two different projects.

What is the problem?

The aim of this trial was to examine Nitrogen Fertilizer Use Efficiency, through the effect on yield of different rates of Nitrogen (N) fertilizer, as well as examining the fate of nitrogen fertilizer throughout the cotton crop season. Replicated trials were also carried out across other cotton growing regions by the CottonInfo Regional Development Officers.

What did the research involve?

The location of the trials is in Red Mill, Moree with soil type as cracking grey Vertosol. The trial itself was called the Gwydir Valley trial hence the title. The rainfall averaged 437mm between November 2014 and April 2015.

What were the key findings?

The trial was picked with each treatment separately, however the plots were not separated. Statistically, there was found to be no significant difference between yield for each treatment. Turn out for each treatment was:
• T1 – 41.9
• T2 – 41.3
• T3 – 42.2

The ideal range for Sicot74BRF is 3.7 to 4.1 percent. Every 0.1 above 3.9 percent N represents about 23 kg N /kg applied in excess. Post season soil tests were conducted as part of the Action on the Ground Project. Samples were taken in the 0-30, 30-60 and 60-90cm profiles, at sites across the three treatments, as 13.16 13.04 13.2 12 12.2 12.4 12.6 12.8 13 13.2 13.4 363 463 563 bales / ha kg N / ha Yield by Treatment well as on the hills, in the irrigated furrows and the non-irrigated (and gassed) furrows. The following graph shows high variation in the remaining mineral N, but a treatment trend from low N to high (treatment 1 to 3), and higher in the hills than furrows.

Final Comment

This trial does demonstrate no yield advantage was achieved through the application of larger amounts of Nitrogen per hectare, and that losses to the environment will occur at these higher rates.

2015 - Alice Devlin - The findings of the Trials conducted by CottonInfo
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