Poder de Germinação de sementes de pensacola (paspalum notatum fluegge VAR. saurae parodi) e pega-pega (desmodium incanum DC.)

Abstract

The persistence of high nutritional value of forage native species is extremely desirable and especially important for the natural pastures of southern Brazil, because they are the main food source of flocks, therefore one should prioritize the use of forage species that have good potential deployment and that meet the demands of the current cattle. the beneficiation can increase the quality of a batch of seed, so knowledge of the germination characteristics of these species are important because they help in pasture establishment and implementation of same, reducing costs and improving production efficiency. The objective of this work was to evaluate the percentage of germination, size of aerial part and root, speed of germination of seeds Pensacola (Paspalum notatum Flgge var. saurae Parodi), as well as germination percentage germination speed and determine the weight of 1000 seeds Pega-pega (Desmodium incanum DC). The project was developed in the Laboratory of Plant Physiology, at the Federal University of Pampa (UNIPAMPA) -. Campus Dom Pedrito, in the period June to August 2014. The seeds of Pensacola were subjected to four treatments with 4 replications of each repetition 50 seeds, being DD - seeds subjected to 12 hours of light and 30 ᵒ C + 12 hours of darkness at 20 ᵒ C; DDF - identical to DD with an increase of 7 to days of cold 10ᵒ C prior to treatment DD; the third treatment DO was consist of 16 hours of darkness at 20 ᵒ C + 8 hours of light at 30 ᵒ C, finally the DOF treatment, identical to treatment DO, with increase of 7 days of cold 10 ᵒ C before initiation of treatment, simulating situations of winter and summer. For the tests of seed germination of Pega-pega two treatments were tested, and the first SL treatment without lomento, CL and second treatment with lomento. The germination of the seeds showed that Pensacola has its highest germination in days with averages higher temperatures and more hours of light. The seeds of Pega-pega had higher germination without the presence of lomento. For the variable days there was statistical difference for virtually all data analyzed. For the seeds of Pega-pega if it was observed that increased their percentage of germination in ascending order with the end of experiment.