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有人认为偶然延长放牧刺激幼苗萌芽,可能延长短期多年生黑麦草(Lolium perenne)的持久性。为了证实这种说法,我们在新南威尔士南部高海拔地区进行了2次地间试验,在短期多年生山黑麦(Secale montanum Guss.cv.Black Mountain)建植的草地上,以10～17只/hm~2的载畜量放牧美丽奴阉羊进行试验。 首次试验(试验1)是山黑麦和喜湿草虉草(Phalaris aquatica)的比较试验。尽管过磷酸钙的施用量大于600kg/hm~2,但这2种地三叶(Trifolium subterraneum)和白三叶(T.repens)混播时,生长和生存能力均较差,2年后不得不放弃了试验。继后,从已施过磷肥的试验1地上,取土进行盆栽试验,结果表明植株的生长对磷肥有极大的响应。 因为在试验1中,低肥力的土壤可能是禾草持久性差的原因,所以在同一试验点进行了第2次试验(试验3),比较山黑麦与多年生黑麦草、鸭茅(Dactylis glomerata)的持久性;每种禾草均和地三叶、白三叶混播,并在3年内施入850kg/hm~2的过磷酸钙。开始时所有禾草生长良好,山黑麦和多年生黑麦草草地羊的增重较明显(100kg/hm~2粗毛和300kg/hm~2活重)。尽管延长了放牧,但3年后山黑麦失去了生存能力,可能是它的持久性对秋季降水量的依赖性更大。第4年山黑麦试验地(三叶草和自生草)的动物产量和多年生黑麦草地的一样高,?
It has been suggested that occasional prolonged grazing can stimulate seedling sprouting and may prolong the persistence of short-term perennial ryegrass (Lolium perenne). To confirm this, we conducted two field trials in the high altitude area of southern New South Wales. On the grassland planted with the short-term Secale montanum Guss.cv.Black Mountain, 10 to 17 / hm ~ 2 stocking grazing Merino geese for testing. The first experiment (Experiment 1) was a comparative test of mountain rye and Phalaris aquatica. Despite the application of superphosphate more than 600 kg / hm2, the growth and viability of the two Trifolium subterraneum and T. repensis were poorly compounded and mixed, and after two years had to be mixed Abandoned the test. Subsequent, from the experiment has been applied phosphate fertilizer on the ground 1, the soil taken pot experiments, the results show that plant growth on the phosphate fertilizer has a great response. Because in test 1 low-fertility soils may be responsible for poor persistence of grasses, a second test was conducted at the same test point (Trial 3), comparing ryegrass with perennial ryegrass, Dactylis glomerata, ; Each grass and land trefoil, white clover mixed sowing, and within 3 years applied to 850kg / hm ~ 2 superphosphate. All the grasses started well at the beginning, and the weight gains of the ryegrass and perennial ryegrass grasses were more pronounced (100 kg / ha-2 shag and 300 kg / ha-2 live weight). Despite prolonged grazing, mountain rye lost its viability after 3 years, possibly because its persistence is more dependent on autumn precipitation. Animal production in the fourth year of the ryegrass trial (clover and self-infested grass) is as high as perennial ryegrass