Topic: stubble

How to account for stubble nutrients next season

Stubbles can be a source of nutrients for next season. Different crops grown under different conditions have varying amounts of nutrients in their stubbles. Nutrient budgets can consider the amount and type of stubble.
How much stubble?

Stubble loads can be estimated from grain yield and the amount of growth. For cereals, […]

When do retained stubbles increase the need for nitrogen?

Microbes use nitrogen (N) from the soil to decompose stubbles. When stubbles have a high carbon: nitrogen (C: N) ratio, soil mineral N is tied-up. Cereal stubbles have a high C: N ratio of around 80:1. Canola stubble C:N ratios are higher and legume stubbles are lower.
As stubbles break down […]

What happens to nutrients when stubbles burn?

Most of the nitrogen (N) and carbon (C) contained in crop stubbles is lost when they are burnt. Around 100 kg/ha of urea could be needed to replace the N lost from burning stubble from a high yielding wheat paddock. Substantial amounts of stubble sulfur (S), phosphorous (P) and potassium […]

What happens to urea with high residue loads?

Question to @aucropnutrition via twitter
What effect do high crop residues have on spread urea? Does some of the applied nitrogen (N) get used to break down the stubble and therefore become unavailable to the plant?
When urea dissolves on the surface of the residues in humid air or dew it gets […]