追氮量对小黑麦再生草生长和草产量的影响

Effects of nitrogen application on growth and forage yield of triticale regrowth

采用单因素随机区组试验设计,研究追氮量对小黑麦中饲237拔节期刈割后的再生草生长和草产量的影响.结果表明,小黑麦再生草的生长和草产量对追氮量非常敏感,当基施尿素为45 kg·hm^-2时,追氮量在0～175 kg·hm^-2纯氮范围内,追氮较不追氮能极显著地提高中饲237再生草的茎蘖数、株高和鲜、干草产量（P﹤0.01）,再生草株高与追氮量呈线性相关（r＝0.888）,茎蘖数、鲜草和干草产量与追氮量呈二次抛物线关系,获得最大鲜、干草产量的追氮临界值为145 kg·hm^-2.

NTH237, triticale,was taken as an experimental material to study the effects of nitrogen application on growth and forage yield of triticale regrowth after cutting at the jointing stage by the design of single factor sand randomized blocks. Analysis of variance indicated that growth and forage yield of triticale regrowth was specially sensitive to the level of nitrogen application. When base fertilizer of urea was at level of 45 kg· hm^-2, nitrogen applying extention was from 0 to 175 kg· hm^-2, compared with not topdressing of nitrogen, tiller numbers, height, fresh forage yield and hay yield of triticale regrowth obviously increased after topdressing of nitrogen （ P 〈 0. 01 ） , the relationship between height of triticale regrowth and level of nitrogen fertilizer application was linear correlation （ r = 0. 888） , the relationship between tiller numbers, fresh forage yield, hay yield of triticale regrowth and level of nitrogen fertilizer application was quadratic parabola, and the critical value of nitrogen fertilizer application was 145 kg · hm^-2 for maximum fresh forge and hay yield.