追施有机肥对高寒栽培牧草产量的影响

目的]探讨在同德高寒地区人工草地追施有机肥的适宜施肥量。方法]在高寒地区旱作条件下,研究了不同追施有机肥量对西北羊茅的生长速度和产量的影响。结果]追施有机肥量对西北羊茅中后期生长速度和产量影响显著,随着追施有机肥量的增加,其生长速度、产量及种子产量均发生变化。追施有机肥水平与牧草产量、种子产量之间呈显著的线性回归关系(R=0.806,P<0.01;R=0.970,P<0.01),追施有机肥1 500 kg/hm2时,西北羊茅牧草产草量达到最高,为19 778.7 kg/hm2;追施有机肥量为2 250 kg/hm2时,种子产量达到最高,为571.1 kg/hm2。追施有机肥的各处理在中后期生长速度明显快于未施肥处理。结论]从高产、高效角度综合考虑,以收获种子为目的时对西北羊茅施有机肥的最佳用量是2 250 kg/hm2。

Effects of Topdressing Organic Fertilizer on the Yield of Cultivated Herbage in Alpine Region

Objective] The research aimed to explore the suitable application amount of topdressing organic fertilizer in the artificial grassland in Tongde alpine region.Method] Under the condition of dry farming in alpine region,the effects of topdressing different amounts of organic fertilizer on the growth rate and yield of Festuca kryloviana were studied.Result] The amount of organic fertilizer had significant effects on the growth rate and yield of Festuca kryloviana in the middle and late period.With the increase of organic fertilizer application,its growth rate,yield and seed yield all changed.The application amount of topdressing organic fertilizer had notable linear regression relation with the herbage yield and seed yield(R=0.806,P<0.01;R=0.970,P<0.01).When the amount of organic fertilizer application was 1 500 kg/hm2,the yield of Festuca kryloviana achieved the maximum(19 778.7 kg/hm2).When the amount of organic fertilizer application was 2 250 kg/hm2,the seed yield arrived at the maximum(571.1 kg/hm2).The growth rate of herbage with fertilization treatment in the middle and late period was faster than the growth rate of that without fertilization treatment.Conclusion] With comprehensive consideration on high yield and high efficiency,the optimal amount of organic fertilizer application was 2 250 kg/hm2 with harvesting seeds as object.