ABSTRACT
Objective: To establish the system of the quality evaluation technology for the seeds of Cynomorium songaricum and to draw up the quality grading standard for the seeds of C. songaricum. Methods: A stereomicroscope, electronic balance, and the method of in vitro embryo culture were used to measure the morphology, grain, and embryo rate and viability for the seeds of C. songaricum. The method of mathematical statistics were adopted to analyze the main index and reference index of dividing grades of seed; The method of standard deviation was applied in developing the seed quality grading standard. Results: Seeds were 1.03-1.63 mm long and 0.69-1.23 mm wide, kernel was about 0.61-1.05 mm long and 0.50-0.50 mm wide. There was a significant correlation among seed morphological indexes (P 0.05) and there was no correlation among the thousand-grain weight, viability, and embryo rate (P > 0.05), while there was a significant correlation between the viability and embryo rate (P < 0.01); the viability was the main index in the quality grading for the seeds of C. songaricum; while the clarity, grain, and water were the reference indicators of quality grading of the seeds. Conclusion: The seed quality of each grade should reach the following requirements. For the first grade seeds: seed viability is not less than 98%, purity is not less than 93%, housand-grain weight is not less than 0.8 g, water content is not higher than 8.0%; for the second grade seeds, the seed viability is not less than 95%-98%, the purity is not less than 86%, the thousand-grain weight is not less than 0.7 g, water content is not higher than 8.0%; for the third grade seeds, seed viability is not less than 90%-95%, purity is not less than 80%, thousand-grain weight is not less than 0.5 g, water content is not higher than 8.0%; seeds that do not reach the standard of the third level are unqualified ones.
ABSTRACT
Um experimento foi conduzido na Universidade de Passo Fundo (UPF) com o objetivo de avaliar as correlações entre teores de N e de clorofila em folhas de aveia branca e entre estes e o rendimento de grãos (RG), massa de mil grãos (MMG), período de enchimento (PEG) e taxa de enchimento de grãos (TEG). O ensaio foi conduzido no ano agrícola de 2003, utilizando-se 21 cultivares de aveia branca desenvolvidas pela FAMV/UPF, distribuídas em blocos ao acaso, em quatro repetições. Estimou-se o teor de clorofila por meio do índice SPAD (clorofilômetro) e determinou-se o seu teor pelo método químico e também os teores de N, nas folhas bandeia e bandeira-1, no estádio de antese. Na maturação (colheita), determinou-se o RG, o MMG, o TEG e o PEG. Verificou-se que não houve correlações significativas entre teores de clorofila com os teores de N, com RG, MMG, TEG e PEG, porém, houve correlações significativas entre teores de N com o RG, MMG e PEG.
An experiment was conducted at the Passo Fundo University, with the aim of evaluate the correlations among nitrogen contents, chlorophyll contents, grain yield (GY), thousand grain weight (TGW), grain filling period (GFP) and grain filling rate (GFR) in oat cultivars. The experiment was conducted during 2003 agriculture year, with oat cultivars developed by Passo Fundo University, with four replications, at random blocks distribution. The chlorophyll contents, estimated by chlorophyll meter (SPAD 502 model) and chemical method, and nitrogen contents were determined at anthesis stage. At maturation stage, the GY, TGW, GFP and GFR variables were determined. It was observed that there were no significant correlations among chlorophyll contents with nitrogen contents, with GY, TGW and GFP, but there were significant correlations among nitrogen contents and GY, TGW and GFP.