The amount of grass fertilizer you decide to apply should take into account several factors, including the type of grass you have planted and the size of your lawn. Phosphorus is one of the three primary plant nutrients. Different types …
Do not apply more than 80 to 100 pounds per acre of N + K 2 O in the starter band. Fertilizer recommendations are based on the amount of actual nitrogen a lawn needs in a year.

Diammonium phosphate (DAP) (chemical formula (NH 4) 2 HPO 4, IUPAC name diammonium hydrogen phosphate) is one of a series of water-soluble ammonium phosphate salts that can be produced when ammonia reacts with phosphoric acid.Solid diammonium phosphate shows a dissociation pressure of ammonia as given by the following expression and equation: () ↽ − − ⇀ + ()
Applying Fertilizer. Applications of P and K should be made prior to establishing a new seeding based on soil test results. When to Fertilize Plants. from the trunk, then spreading out to the tree drip line.

When to Apply Super Phosphate to a Garden. The use of a guava tree fertilizer with a 6-6-6-2 (nitrogen–phosphorus–potassium–magnesium) ratio is recommended. The main advantages are as follows: i) When the fertilizer is placed, there is minimum contact between the soil and the fertilizer, and thus fixation of nutrients is greatly reduced. Apply fertilizer three times a year in January-February, May-June and September-October. Now, I'm not totally opposed to fertilizing pastures in the spring. Advantages of placement of fertilizers. For a 60-bushel per acre soybean crop, this is 48 pounds per acre of actual P 2 O 5 or 90 pounds per acre of monoammonium phosphate (MAP) or 100 pounds per acre of diammonium phosphate (DAP). Thus, a good starter fertilizer might range from a ratio of 1-4-0, 1-3-1, 1-3-3, to 1-1-1, depending on the rate of fertilizer required. Then water and till the soil in order to incorporate the fertilizer. There are a number of different methods for applying fertilizer, including direct application by hand, broadcast application, dilution application and using mechanical equipment to side dress the fertilizer to the growing bed. The Earliest seed germination is not earlier than 6 days and roots are initiated.Nitrogen does not stay in soil beyond 36-48 hrs. Apply approximately 1 pound of actual nitrogen for every 1,000 feet of lawn at a time. DAP is a fire-retardant chemical that is used as a fertilizer to add nitrogen to soil all over the word. Good timing of the fertilizer application increases yields, reduces loss of nutrients and prevents damage to the environment.