Search

This work verified the physiological quality of seeds of two maize cultivars treated in isolation and in association with an inoculant based on Azospirillum brasilense, biostimulants and a liquid fertilizer. The experiment was designed in a completely randomized 2x8 factorial scheme, comprising two maize cultivars (P30F53 and P30F53YH) and eight seed treatments (untreated; treated with inoculant; treated with biostimulants; treated with liquid fertilizer; treated with inoculant and biostimulant; treated with inoculant and liquid fertilizer; treated with biostimulant and liquid fertilizer; treated with inoculant, treated with liquid fertilizer and biostimulant). Percentage of germination, emergence in sand, germination speed index, cold test, and dry mass of shoots and root of seedlings were evaluated. The cultivar P30F53YH had seeds with better physiological quality compared with the cultivar P30F53 when treated with biostimulants, liquid fertilizer and Azospirillum. The biostimulant, liquid fertilizer and Azospirilum. either on their own or in combinations not involving the liquid fertilizer do not impair physiological qualityof maize seeds. Made available in DSpace on 2021-12-28T19:00:43Z (GMT). No. of bitstreams: 1 Physiological-quality.pdf: 298743 bytes, checksum: d2e42be2f7a81301e827591f811835d2 (MD5) Previous issue date: 2021

Introducing cultivars of high productive potential with adequate agronomic management has contributed to the increase of maize yield in Brazil. This study aimed to characterize the extraction and exportation of micronutrients by modern maize hybrids grown in no-tillage system in the Cerrado region (Brazilian Savannah) with two fertilization levels. We established two crop environments with differentiated levels of soil fertilization, use of products for seed treatment and leaf fertilization, in which four transgenic hybrids were grown. For each environment, we used an experimental design of randomized blocks with four replicates. There were eleven plant samplings during the crop cycle to quantify dry mass production and Cu, Fe, Mn and Zn extraction. Micronutrient uptake is increased when a hybrid with higher potential for biomass production grows in an environment with greater supply of nutrients. Uptake persists throughout the maize cycle, including during the final stages of the reproductive phase, showing late demand for the crop. On average, after tasseling, about 39, 50, 42, and 49% of the total Cu, Fe, Mn and Zn absorption still occurs, respectively. Total uptake of Cu, Fe, Mn and Zn are, respectively, around 8, 199, 58 and 40 g to produce a tonne of grain, from which 23, 5, 8, and 42% are exported by the harvest. Micronutrient uptake and exportation rates for the studied transgenic hybrids are lower than the ones previously reported in Brazil and in works abroad. Keywords Made available in DSpace on 2019-01-12T23:32:55Z (GMT). No. of bitstreams: 1 Uptakeexportation.pdf: 658811 bytes, checksum: 33b9a7e9300c8f4d5310d6f4fd158ea7 (MD5) Previous issue date: 2019-01-11