Nitrogen and potassium fertilization on the yield and intensity of the maize white spot

Abstract

RESUMOA plant's nutritional balance can influence its resistance to diseases. In order to evaluate the effect of increasing doses of N and K on the yield and severity of the maize white spot, two experiments were installed in the field, one in the city of Ijaci, Minas Gerais, and the other in the city of Sete Lagoas, Minas Gerais. The experimental delimitation was in randomized blocks with 5 x 5 factorial analysis of variance, and four repetitions. The treatments consisted of five doses of N (20; 40; 80; 150; of N in the experiments 1 and 2) and five doses of K (15; 30; 60; 120; 180 Kg ha -1 of K in experiment 1 and 8.75; 17.5; 35; 50; 100 Kg ha -1 of K in experiment 2). The susceptible cultivar 30P70 was planted in both experiments. The plot consisted of four rows 5 meters long, with a useful area consisting of two central rows 3 meters each. Evaluations began 43 days after emergence (DAE) in the first experiment and 56 DAE in the second one. There was no significant interaction between doses of N and K and the disease progress. The effect was only observed for N. The K did not influence the yield and the severity of the disease in these experiments. Bigger areas below the severity progress curve of the white spot and better yield were observed with increasing doses of N. Thus, with increasing doses of N, the white spot increased and also did the yield. Keywords

Interaction of K and B in the Intensity of Coffee Rust in Nutrient Solution

“…When the water, soil fertility and plant mineral nutrition are managed well and balanced accurately, it can be a complementary or alternative means of minimizing and managing diseases, as they play a crucial role in producing resistance barriers against disease (CARRE-MISSIO et al, 2009;PINHEIRO et al, 2011;DORNELAS et al, 2015;PEREZ et al, 2017), and the effect of the phytopathogenic activity of the plant. ) and Fe-EDTA solution (1.0 mL L -1 ).…”