ABSTRACT
The corn crop is highly responsive to nitrogen fertilization; however, the application of high doses generally causes a reduction in the use efficiency of fertilizer. In this sense, this study aimed to determine the yield and nitrogen balance in corn grown under the no-tillage system. The experiment consisted of the application of four nitrogen doses (0, 30; 70 and 95 kg ha-1). In all plots with the AG 1051 hybrid corn, 80 and 56 kg ha-1 of P2O5 and K2O were applied, respectively. The experiment was arranged in a randomized block design with five replications. The grain yield had a linear increasing behavior according to the nitrogen doses, which reached 5,684.79 kg ha-1. The fertilization efficiency and the N extraction increased linearly with the increase of the nitrogen doses, obtaining with the highest dose the extraction of 114.93 kg ha-1 of N and a fertilization efficiency of 65%. The soil N stock of 4,489 kg ha-1 provides corn plants with 52.81 kg ha-1 of this nutrient. Corn adjusts the biomass production according to the availability of nitrogen, with no effect of N doses on the nutrient content in plant tissues.
Key words:
Zea mays; fertilization efficiency; nitrogen fertilization; nitrogen in the soil
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ns and ** - Not significant (p ≤ 0,05) and significant (p ≤ 0.01), respectively, by the t-test
** - Significant at p ≤ 0.01, by the t-test
ns, ** and * - Not significant (p ≤ 0.05), significant at p ≤ 0.01 and p ≤ 0.05, respectively, by the t-test
ns, ** and * - Not significant (p ≤ 0.05), significant at p ≤ 0.01 and p ≤ 0.05, respectively, by the t-test
** - Significant at p ≤ 0.01, by the t-test
