追氮对饲用青莜麦生物产量及秸秆蛋白质含量的影响

为给冀西北高原饲用青莜麦高产栽培提供科学依据，研究了追氮对青莜麦生物产量和秸秆蛋白质含量的影响。结果表明，追氮可显著提高青莜麦生物产量和秸秆的蛋白质含量。沙地追氮69kg／hm^2时增产显著，青莜麦生物产量达6023．4kg／hm^2；此水平下，滩地青莜麦的生物产量最高，生物产量达9013．4k／hm^2。追氮69kg／hm^2时，沙地青莜麦秸秆中粗蛋白和真蛋白含量分别为12．09％和7．45％，比对照提高了6．81和3．61个百分点，追氮量每增加69kg／hm^2，青莜麦秸秆中粗蛋白质和真蛋白的增幅均显著下降趋势。追氮对滩地青莜麦秸秆中蛋白质含量的影响相对较小。滩地追氮69kg／hm^2时，青莜麦秸秆中粗蛋白和真蛋白含量分别达10．34％和5．75％，分别比对照增加1．89和0．27个百分点。

Effect of Nitrogen on Biomass and Quality of Forage Green Naked Oat

The effects of different nitrogen applied amounts on biomass and quality of Forage Green na-ked oat were studied. The result showed that biomass and protein contents could increase by additional nitrogen fertilizer. When the amount of nitrogen application was 69 kg/hm^2 in sandy chestnut soil,the biomass of forage green naked oat was 6 023.4 kg/hm^2, and was higher than CK. The highest biomass in medium loam meadow chestnut soil was achieved under 69 kg/hm^2 nitrogen, and it was 9 013.4 kg/hm^2. The straw crude protein content and true protein content were 12.09% and 7.45%and were 6.81 and 3.61 percentage points higher than CK under 69 kg/hm^2 nitrogen in sandy chestnut soil, quality. The effect of nitrogen on of forage green naked oat in medium loam meadow chestnut soil was smaller than that in sandy chestnut soil. When the amount of nitrogen application was 69 kg/hm^2 in medium loam meadow chestnut soil, the straw crude protein contents and true protein contents were 10.34% and 5.75%, and were 1.89 and 0.27 percentage points higher than that of CK.