The influence of sowing method on perennial grass establishment. I. Dry matter yield and botanical composition

Abstract

'Demeter' tall fescue (Festuca arundinacea Schreb.) and 'Victorian' perennial ryegrass (Lolium perenne L.) were sown separately into a white clover (Trifolium repens L.) dominant pasture in June 1981. Eight sowing methods were compared to assess the ability of perennial grasses to establish from direct drill sowing methods relative to conventional seedbed and aerial sowing methods. Within direct drill treatments, two drill implements were factorially combined with three herbicide treatments. Pasture production and botanical composition were sampled over a 27 month period following sowing. After a dry summer, 22 months after sowing, sown grasses dominated pasture composition (69-94% of total dry matter yield) in the high yielding treatments. At this time, the successful direct drill treatments were similar in yield to the conventional seedbed treatment. Within direct drill treatments, sowing implement had little effect on yield and composition, whereas herbicide application markedly increased sown grass yield. Pre-sowing blanket application of herbicide in the triple disc treatment increased tall fescue yield from 82 to 1504 kg ha-1 and perennial ryegrass yield from 98 to 807 kg ha-1. An inverse relationship was described between dry matter present at sowing and eventual yield of sown grasses. These perennial grasses can be successfully established by using direct drill sowing methods provided resident vegetation is adequately suppressed.