Write the next sentence in this paragraph:

How to prevent fertilizer runoff
Use phosphorus-free fertilizer.
Most fertilizer bags will have a ratio of nitrates-phosphorus-potassium printed on the outside of the bag. Look for a number like 32-0-25, where the middle number, denoting phosphorus content, is zero.

Select from the following.
[i] A typical fertilizer bag contains 9 nitrates per square foot. Phosphate bars can be purchased at gardening and home improvement stores.
[ii] The different numbers on the bag are also graded according to time of year. Phosphate refers to the ratio of nitrogen and nitrogen by the caratomic (or cubic diatomic) process.
[iii] Phosphorous is the largest source of concern when it comes to controlling fertilizer runoff, because it's dangerous to aquatic plants and wildlife. Clean up grass, leaves, and other yard debris.
[iv] In general, you should use nitrate-free fertilizers. Nitrate levels will fluctuate over time, though nitrates can come in regular amounts, so you should use a balance meter to calculate nitrate levels for all fertilizers.
[iii]