
— The next step is to determine what type of fertilizer to apply, and how much, based on the N-P-K ratios needed. With the N-P-K ratios she needs (45 lbs/acre N, 100 lbs/acre P, and 50 lbs/acre K), some good choices for her would be a 4-8-4 or a 10-20-10 fertilizer because they roughly maintain those ratios.