I sprayed liquid fertilizer from a hand pump sprayer from the shore in my one acre pond in it's first 2 years. The results were amazing and all of my friends were asking for advice. It teemed with life. Damn, I was good. Then 4 or 5 windless, cloudy days occurred and I got to watch die offs, 2 years in a row. Bigger fish went first. By the end of the long, hot, Texas summer my reputation had, to put it mildly, kinda waned. I was having to buy my own beer again.

I took the pledge and swore off. I've noticed no lack of productivity since and have had no DO crashes. I'm still loaded with bluegill of all sizes. I expect fertilizer is OK but you need to recognize the risk. If I knew I would always have dependable rainfall, I might do it. But then, I wouldn't do it unless I needed to.