Riverine Plains Blog

Key Messages

• Stubble retention has many benefits for soil health, can improve soil moisture and help maintain soil organic carbon levels
• Different methods of sowing and equipment result in different thresholds for change in terms of maximum stubble load that can be retained
• If full stubble retention is not feasible due to machinery, weeds or disease constraints, there are other options such as shallow incorporation, slashing straw or cutting short at harvest which can reduce the frequency of burning

Benefits of Stubble Retention

Retaining stubble can reduce the impacts of soil erosion. At least 70 per cent ground cover minimises water erosion risk and 50 per cent ground cover minimises wind erosion risk. Stubble height should be at least one-third of the width of crop rows. In general, the shelter provided by a barrier is approximately three times its height; 10 cm tall stubble will protect the adjacent 30 cm of topsoil. (Source: Managing stubble | General agronomy | Crop production | Grains, pulses and cereals | Crops and horticulture | Agriculture Victoria )

Key Messages:

• Nitrogen is a key yield-limiting factor for grain crops 

• Economic yield responses to applied nitrogen can occur until around flag leaf emergence in...

Key Points:

• Check crops now for signs of cereal rust and other diseases 
• Time fungicide applications to protect the yield-producing leaves  
• Rotate fungicide groups to reduce the risk of resistance developing 

Given early disease build up in areas of NSW and Victoria, ongoing wet conditions and the widespread planting of susceptible cultivars, Riverine Plains region growers are encouraged to inspect crops now for signs of rust and other cereal diseases.  

Key Points:

• Use pesticides judiciously to prevent resistance developing 
• Use a range of strategies to manage pest populations 
• Consider resistance testing on suspect populations 

While we might defer a lot of our pesticide management decisions to our advisors, as farm business managers (and spray applicators), we ultimately have the final say in what goes onto our paddocks and when.  

Key points 

• Introduce stock slowly to grazing cereal and canola/brassica crops  
• Feed test to know the quality of your crop 
• Avoid nutrient imbalances when grazing young crops by providing a mineral/salt lick and roughage 
• Know the signs of nutrient-related animal health disorders. 

While some farmers have already started grazing winter forage crops, some later-sown crops will only be ready for grazing now. Cereals are ready to be grazed when they have developed secondary roots and are well anchored, usually around the 3-leaf stage.