Effects of defoliation and nutrients on growthPoa trivialisL. with perennial ryegrass

摘要

For swards ofPoa trivialisL. andLolium perenneL. #x2018;Grasslands Ruanui#x2019;, in whichP. trivialiscontributed about 20 to harvested herbage yield in autumn, neither variation in frequency (17.8 cm or 7.6 cm height of herbage at cutting) or in intensity (5.t cm or 2.5 cm stubble after cutting) of defoliation prevented dominance ofP. trivialisin winter. Although variation in intensity of defoliation affected subsequent rate of regrowth of the species contributing most to herbage yield in autumn and winter, ryegrass andP. trivialisrespectively, rate of regrowth of the other species was not affected.P. trivialisdominance of ryegrass continued into spring until affected by dry weather.