ABSTRACT
ABSTRACT: The use of larger seeds may improve the initial development, plant stand, and mass productivity in forage crops. The present study aimed to evaluate the effect of the size of seeds of Sudan grass (Sorghum sudanense L.), standardized on density, on parameters of physiological quality and crop productivity. Seeds were processed in a gravitational table in order to become uniform in terms of density and then submitted to sieves with apertures of 1.75 or 2.00 mm. Three different treatments (seeds without size classification, seeds with diameter between 1.75 mm and 1.99 mm, and seeds with diameter above 2.00 mm) were compared. This study consisted of a laboratory stage for the analysis of physiological variables of seed, and a stage in field plots under a randomized block design and 3 replicates. Larger seeds presented better physiological and productive performance and had a higher germination rate, seedling growth, and forage yield at the first cut. Both the sieve with opening of 1.75 mm and that of 2 mm were suitable for processing of seeds of this species.
RESUMO: O emprego de sementes maiores pode melhorar o desenvolvimento inicial, o estande de plantas e a produtividade de massa em cultivos forrageiros. Este trabalho visou avaliar o efeito do tamanho da semente de capim sudão (Sorghum sudanense L.), padronizada quanto à densidade, sobre parâmetros da qualidade fisiológica e de produtividade da cultura. As sementes foram processadas em mesa gravitacional, para serem uniformizadas em termos de densidade, e depois submetidas ou não a peneiras com abertura de 1,75 ou 2,00 mm. Assim, foram comparados três tratamentos (sementes sem classificação por tamanho; sementes com diâmetro entre 1,75 mm e 1,99 mm; e sementes com diâmetro acima de 2,00 mm). O trabalho consistiu de uma fase laboratorial, para análise de variáveis fisiológicas da semente, e uma fase em parcelas a campo, sob delineamento em blocos casualizados e três repetições. Sementes maiores apresentaram melhor desempenho fisiológico e produtivo, sendo superiores na taxa de germinação, crescimento de plântula e rendimento de forragem ao primeiro corte. Tanto a peneira com abertura de 1,75 mm quanto a de 2 mm mostraram-se adequadas para o processamento de sementes da espécie.
ABSTRACT
Objective To explore the present stage newborn loss of hearing morbidity situation of Guangyang District in Langfang,in order to carry the early intervention.Methods The application distortion product ear sound launch meter 2823 newborns who the women's and children's dispensary is born to Guang Yangqu carries on the hearing to sieve looks up,initially sieves passing about 42 days duplicate not to sieve,duplicate does not deve pass ing,transfers the Langfang mother and child care center to make the ABR inspection,ABR passing has not changed over to the Beijing Colleague Hospital hearing diagnostic center further to inspect.Results Initially sieves the newborn 2823 examples,the diagnosis loss of hearing(light,medium and heavy)8 people,the loss of heating disease incidence rate 2.83‰.Conclusion Guang Yangqu the newborn loss of heating disease incidence rate 2.83‰,the specific weight loss disease incidence rate 1.06‰,through sieves looks up,the newborn loss of heating may the early time discover,the early diagnosis,carries on the early intervention,may enhance the hearing impairment spoken language growth.