Propagação de Axonopus parodii, Paspalum notatum E Paspalum lepton para cultivo de gramados

Abstract

To lawns could be established by seeds, nevertheless is necessary improve the germinate rates and increase the sanitary quality of the seeds. Thus, generally the lawns implantation is established by vegetative propagules that are small cores of sod or pieces of stolons or rhizomes with leaves. Therefore, the vegetative propagules capacity of storage and transport to introduce a new material should be known, as it will impact on the establishment of the lawn. The objective of this work was to determinate the physiological and sanitary quality of the seeds of Paspalum notatum and P. lepton after use overcoming dormancy methods and evaluate the tolerance to low temperature storage of Axonopus parodii, P. notatum and P. lepton vegetative propagules. To determinate the physiological and sanitary quality, the seeds were submitted to the following treatments: concentrated H2SO4 (98%) for 15 minutes and KNO3 (0,2%). Germination, vigor (first count and emergence in soil), germination speed index and sanity were evaluated. The results obtained allowed to conclude that the chemical scarification with concentrated sulfuric acid, for 15 minutes, provided the increase of the germination of P. notatum e P. lepton seeds and reduction of fungal incidence. To evaluate the tolerance to low temperature storage of vegetative propagules of Axonopus parodii, Paspalum notatum and P. lepton for lawn implantation, the propagules were stored in a cold chamber at 6,5°C and 85% UR, according to the treatments, in: control with zero storage day (0 DA); 2 DA; 4 DA; 6 DA; 8 DA; and 10 DA. The following characteristics were evaluated before planting: initial fresh mass; fresh mass after storage, before planting; and loss of fresh mass. After 40 days of planting were evaluated: survival rate; soil cover capacity; height; tillers production; and total dry mass. Despite the loss of fresh mass, storage at 6,5°C until 10 days preserved the viability of the vegetative propagules of the Axonopus parodii and Paspalum accessions, maintaining the survival rate, soil coverage and tiller emission.