The study looked at how different types of fertilizer affect wheat yield and nutrient uptake in dry land with varying levels of rainfall. By comparing different fertilizer treatments, researchers found that using a combination of nitrogen, phosphorus, and manure together resulted in the highest increase in wheat yield. This combination also led to the highest uptake of nitrogen, phosphorus, and potassium by the wheat plants. Overall, using the right mix of chemical fertilizer can significantly boost wheat yield, especially when manure is included in the mix.