Dataset for: Effect of nitrogen fertilization on potato late blight in the field in Oxapampa, Pasco, Peru

For the more resistant variety, late blight had little effect on yield when N was applied at 0 or 160 kg·ha-1. Increasing the N fertilization rate to 320 kg·ha-1 did not further increase yield in the absence of late blight, but decreased it sharply in the treatments where the disease was present because no fungicides were applied. These results indicate the importance of considering N fertilization levels in integrated management schemes for potato late blight, and in comparison of results across experiments.

If farmers want to increase potato yields with N fertilizer, they may need to use more fungicides or varieties with higher resistance.