TIME REDUCTION FOR SURINAM GRASS SEED GERMINATION TEST

Ciência e Agrotecnologia

Camila De Aquino Tomaz¹  Cibele Chalita Martins¹  Mauricio Feis Ganz Sanches¹  Roberval Daiton Vieira¹ 

关键词: Brachiaria decumbens;    dormancy overcoming;    ideal temperature;    Brachiaria decumbens;    superação de dormência;    temperatura ideal;   

DOI  :  10.1590/S1413-70542015000500007

来源: SciELO

【 摘 要 】

ABSTRACTThe period for the germination test of Surinam grass seeds established by the Rules for Seeds Testing is 28 days, considered too lengthy by producers, venders, and seed analysis laboratories. So, the objective of this research was to evaluate the possibility of reducing the time for the germination test of Surinam grass seeds and to establish a method for dormancy breaking and the ideal temperature. Ten seed lots were submitted to the following treatments to overcome seed dormancy: control; substrate moistening with 0.2% KNO3; and scarification with sulfuric acid (98% 36 N) for 15 minutes. After the treatments, the lots were submitted to seed water content, germination and tetrazolium tests. During the germination test, conducted with four replicates of 100 seeds per treatment for 28 days, two conditions of alternating temperatures (20-35 °C and 15-35 °C) with 8 hours of light were tested. Attempting to determine the test end date, daily counts of the number of normal seedlings were made and for each lot, treatment, and temperature, a growth curve for the evaluation of germination was adjusted. The segmented regression model parameter estimations were calculated for each treatment. The germination test of Braquiaria decumbensseeds may be evaluated in 12 days after sowing using alternating temperatures of 20-35 °C and without any treatment to overcome dormancy.

【 授权许可】

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