Qualidade fisiológica e resistência do recobrimento de sementes de milho

this work was developed with the objective of evaluating the physiologic quality of corn seeds uenf 506-8 covered and the resistance of the covering using different proportions of cement. it was used in the covering of the seeds a mixture of lime and culture media. as cement was used polivinil acetate glue (pva). the covering of the corn seeds was executed with a mixture of 70% (w/w) of lime, 10% (w/w) of semi-solid culture media jnfb and 20% (w/w) of water. in the mixture different proportions were added: 0,5; 1; 2; 3; 4 and 5% (w/w). evaluating the resistance of the covering was simulated the transport and the manual seeding, and the mechanical seeding of the covered seeds. the evaluation of the physiologic quality of the seeds was accomplished in seeds not covered and covered seeds with the proportions of cement: 0,5; 1; 2; 3; 4 and 5%. the increase of the proportion of cement of 2 for 3% caused a small reduction no significant in the speed of the germination, emergency speed and emergency, but it didn't affect the final number of normal plants in the germination test and cold test. for the manual seeding the use of 2% of cement is recommended and for the mechanical seeding 4% of cement.