Efectos del fertirriego en el cultivo de maíz

This work seeks to generate information on fertilization strategies with nitrogen (N) in corn under irrigation. The experiment was carried out at the experiment station “Dr. M. A. Cassinoni” in Paysandú, Uruguay during the spring-summer 2020-2021. The experimental design used was completely randomized blocks with 4 repetitions. Said experiment consisted of eleven treatments, of which ten of them took into account different doses and sources of N applied through three different divisions during the crop cycle and a control without fertilization. The doses evaluated were 100 and 200 kg of N ha-1, while the sources evaluated were liquid urea (fertigation) and solid, respectively. Regarding the evaluated fractionations, they consisted of: 1) applications of 100% of the dose to V6, 2) applications of 50% of the dose to V6 and V10 respectively and 3) applications with a weekly fractionation (every 4 days) of the doses between stages V6 and R1, according to physiological scale. When carrying out the statistical analysis, a response to the dose and the source of N used were found. The differences observed in yield in this work showed a positive trend from the increase in the dose and also improvements were observed in the absorption of added N when the application was carried out by fertigation. However, when evaluating the treatment 100 Liq. V6, using half the dose, did not show differences with respect to the superior treatments in relation to the variables analyzed. In this work it was shown that the NG was decisive in performance, since it presented a correlation with superior performance in relation to the PG (R2: 0.87 vs R2: 0.74). In this sense, a positive trend was observed in the NG associated with the increase in the dose and the application in fertigation. While fractional doses of 100 kg of N ha-1 from V6 presented negative effects on the NG. Regarding the PG, a positive trend was observed associated with the increase in the dose and the use of liquid sources. In turn, it is highlighted that applications of 100 % of the dose to V6 have effects on the PG, showing a favorable trend in said component when increasing the dose from 100 to 200 kg of N ha -1.