Tesis
Sementes de braquiária submetidas ao contato com adubo químico
Fecha
2016-02-26Registro en:
AVELINO, Anne Caroline Dallabrida. Sementes de braquiária submetidas ao contato com adubo químico. 2016. 49 f. Dissertação (Mestrado em Agricultura Tropical) - Universidade Federal de Mato Grosso, Faculdade de Agronomia, Medicina Veterinária e Zootecnia, Cuiabá, 2016.
Autor
Abreu, Joadil Gonçalves de
http://lattes.cnpq.br/1410481664723748
Abreu, Joadil Gonçalves de
830.338.746-49
http://lattes.cnpq.br/1410481664723748
Camili, Elisangela Clarete
262.718.108-45
http://lattes.cnpq.br/7599429487582546
830.338.746-49
Oliveira, Isis Scatolin de
000.233.331-70
http://lattes.cnpq.br/4555966329813499
Institución
Resumen
In integrated crop-livestock system, it highlights the sowing of grain
crops with forage in intercropping, in which the forage seed can be sown
simultaneously with the grain-producing crop, mixing and distributing it with the
fertilizer. Goal was to evaluate the effect of contact time on the physiological quality
of Brachiaria seed with the formulated 05-25-15 (N-P2O5-K2O), commonly used in
corn seeding. Two experiments were conducted in a completely randomized design,
with five treatments and four replications. Treatments consisted of 0, 24, 48, 72 and
96 contact hours of Brachiaria brizantha cv. Marandu and Brachiaria ruziziensis cv.
Kennedy seeds with formulated 05-25-15. After contact time, seeds were separated
from fertilizers, quantified for water content and submitted for the tests: first
germination count, germination, tetrazolium (viability), electrical conductivity,
accelerated aging, first emergency count in sand, sand emergency, emergency
speed index, length of larger root and shoot, and seedling dry mass. The results
were submitted to analysis of variance and regression at 5% probability. Regarding
Brachiaria brizantha cv. Marandu seeds, effect of contact time was observed for
variables: germination, first emergence count, emergence speed index and electrical
conductivity. Comparing the treatment of 96 hours of contact with the absence of
contact, the results indicate a negative linear effect of contact time, with a reduction
of 46.48; 24.54; and 21.89% in germination, first emergency count and emergency
speed index, respectively. There was a positive linear effect of contact time with an
increase of 110.38% in electrical conductivity. Considering the Brachiaria ruziziensis
cv. Kennedy seeds, no effect of contact time was observed for variables: electrical
conductivity, accelerated aging and viability. There was a positive linear effect of
contact time on the electrical conductivity and a quadratic effect on accelerated
aging. An increase of 23.93% was observed at the electrical conductivity values
when comparing the treatment of 96 hours of contact with the absence of contact and
a minimum of 66.50% of germination when reaching 42 hours in accelerated aging.
Results obtained for both grasses are related to the fertilizer characteristics, such as
saline power and obtaining by acid pathway. Based on the minimum germination of
60% required for commercialization, it is recommended the immediate sowing of
Brachiaria brizantha cv. Marandu seeds and sowing up to 96 hours of Brachiaria
ruziziensis cv. Kennedy, after mixing with fertilizer.