Maize needs enough nutrients to grow well and produce high yields. In Ethiopia, a study was done to find the best amount of NPSZn and Nitrogen fertilizers for maize. They tested different levels of these fertilizers and found that using 100 kg of NPSZn with 35.4 kg of Nitrogen per hectare gave the highest grain yield. This combination also had the highest return on investment, making it a good choice for increasing maize production in similar areas.