CSU fact sheet on grass fertilizer requirements.
- In Colorado, nitrogen and phosphorus are the two nutrients that must be considered for optimum productivity of cool season grass and grass/legume mixtures.
- It is much more effective to address nutrient deficiencies prior to planting than after a stand is established.
- In most situations, nitrogen is not recommended for establishing grass/legume mixtures because nitrogen stimulates grasses to the detriment of the legume.
- Care should be taken with any fertilizer containing ammonium or urea, as both of these can cause seedling injury if they come into direct contact with seed.