In this podcast, Dr. Steve Petrie discusses the final R of the 4R's Nutrient Stewardship Principle: the right timing - when to apply the treatment to maximize the crops use efficiency.
Many crops receive most or much of their nutrients in a pre-plant or perhaps a combination of pre-plant + early topdress / sidedress application. Generally, the highest nutrient efficiency is achieved when the nutrient application is synchronized with crop needs, alongside with the right source, rate, and placement of fertilizer.
Also in this episode:
- Crop nutrient demand follows a sigmoidal curve
- Nutrient uptake curves are available for many crops showing when the N, P, K, Ca, Mg, S, etc. are taken up by the crop
- Coated, controlled-release fertilizers offer the potential to apply the entire crop need in one application
- N can be applied late in the growing season to increased protein in bread-type wheat
- Currently, the use of multiple nutrient applications is limited to irrigated crops
The Right Placement
The Right Source
The 4 R's of Nutrient Stewardship - The Right Rate
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