供氮水平对不同紫花苜蓿产量及品质的影响  

Effects of Different N Levels on Productivity and Quality of Alfalfa Varieties

作　　者：刘晓静 刘艳楠 蒯佳林[2] 齐敏兴 张晓磊 

机构地区：[1]草业生态系统教育部重点实验室(甘肃农业大学)甘肃农业大学草业学院甘肃省草业工程实验室中-美草地畜牧业可持续发展研究中心,甘肃兰州730070 [2]甘肃省农业科学院,甘肃兰州730070

出　　处：《草地学报》2013年第4期702-707,共6页Acta Agrestia Sinica

基　　金：草业生态系统教育部重点实验室(甘肃农业大学)开放课题(CYZS-2011012);甘肃省财政厅项目"外源氮素供应对紫花苜蓿产量和品质形成影响研究";甘肃省自然基金项目(1010RJZA157)资助

摘　　要：在甘肃兰州秦王川地区以甘农3号(Medicago sativa‘Gannong No.3’)和陇东苜蓿(M.sativa‘Longdong’)为材料,设置3个供氮水平处理N0(0),N1(51.75kg.hm-2)和N2(103.50kg.hm-2),对其产量、株高及营养品质进行测定,以探讨供氮对紫花苜蓿的综合影响。结果表明:供氮对紫花苜蓿综合影响明显,供氮能显著提高其产量,且产量随供氮水平的增加而增加,在N2水平下紫花苜蓿总产量最高,甘农3号的最高鲜草产量为51005kg.hm-2、干草产量为14856kg.hm-2,陇东苜蓿鲜草产量为35486kg.hm-2,干草产量为11217kg.hm-2,甘农3号明显优于陇东苜蓿;供氮还显著提高2个品种的株高,株高与产量变化趋势一致,甘农3号表现更佳;供氮也改善了紫花苜蓿营养品质,显著降低2个品种酸性洗涤纤维、中性洗涤纤维和粗灰分的含量,提高其粗蛋白和粗脂肪的含量。因此,从产量和营养品质综合考虑,该地区最佳施氮量为103.50kg·hm-2。In order to understand the comprehensive influence of N supply on alfalfa, the effects of three N levels （NO （0）, N1 （51.75 kg ~ hm-2）, N2 （103.50 kg ~ hm-2）） on the productivity, height and quality of Medicago sativa ＇Oannong No. 3 ~ and M. sativa ＇ Longdong ~ were studied in the Qinwangchuan of Gansu Province by randomized block design. Results showed that comprehensive influence was obvious un- der N supply, and productivity increased along with N fertilizer increased. The productivity of alfalfas reached the highest under N2 （103.50 kg ~ hm-2） level and Gannong No. 3 was obviously better than Longdong. The highest fresh biomass and dry biomass of Gannong No. 3 were 51005 kg ~ hm-2 and 14856 kg ~ hm-2 , Longdong were 35486 kg ~ hm-z and 11217 kg ~ hm-2. N supply also significantly increased the height of both alfalfa varieties. The change-trend for height was consistent with that of productivity, and Gannong No. 3 did better than Longdong. In addition, N supply could improve the nutrient quality of alfalfa, significantly reduce ADF, NDF and ash contents and increase crude protein and ether extract con- tents. The best N application rate was 103.50 kg hm-2.

关 键 词：紫花苜蓿 氮 产量 品质 

分 类 号：S143.1[农业科学—肥料学] S541.9[农业科学—农业基础科学]