Remember: This is only a guide and requirements and nutrient values may differ depending on specific situations. *NPK requirements derived from RB209. MgO & SO 3 requirements adapted from industry recommendations in RB209 (Fertiliser Manual) & PDA booklet (Potash Development Association). Step 1 - Decide on your YIELD POTENTIAL EXAMPLE: (SNS 1) Working on an average of 40 t / ha my maize crop requires... N P K MgO SO 3 125 55 175 30 60 Step 2 - Choose your STARTER FERTILISER EXAMPLE: Maize START-UP (14N 35P + 5MgO + 10SO 3 ) down the spout @ 125 kg / ha will apply... N P K MgO SO 3 17.5 44 0 6.2 12.5 Step 3 - Choose your MAIN FERTILISER... ...depending on ORGANIC MANURE USAGE EXAMPLE: Planning on applying 25 m 3 /ha OF CATTLE SLURRY in late spring and incorporating within 24 hours giving... N P K MgO SO 3 26 30 80 15 17.5 so... I will apply Maize FIX-TWO @ 396 kg / ha N P K MgO SO 3 55 0 95 11.9 43.5 The final requirements look like this... N P K MgO SO 3 26.5 0 0 0 0 Step 4 - Choose your FINAL FERTILISER EXAMPLE: Looking at the final requirements, a top dressing of Nitrogen should be applied no later than the 3 leaf stage after weed control. CAN 27n 4MgO ap- plied @ 98 kg / ha will supply what is needed. Actual nutrients applied:- N P K MgO SO 3 125 74 175 33 74 Following this process carefully will ensure you get the most out of your maize crop and adhere to the legislation regarding organic manures and nitrogen.
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