亨特草地早熟禾草坪施氮效应

Effects of Nitrogen Sources on Kentuckybluegrass

4种不同氮肥 (硫酸铵、硝酸钠、硝酸铵及尿素 )显著提高了亨特早熟禾 (Poapratensiscv .Huntsville)的出叶、生长与成坪速度 ,增加了草坪地上、地下部生物量 ,提高了草坪的生活力 ,有效地改变了草坪的外观质量。其中 ,硫酸铵对亨特早熟禾的分蘖能力影响最大 。

Based on a completely randomized design, four conventional nitrogen sources (ammonium sulphate, sodium nitrate, ammonium nitrate and urea) are applied comparatively to analyze the respective effects on biological and qualitative characteristics of Poa pratensis cv.Huntsville. On comparasion with the checks (without nitrogen application), the four kinds of nitrogen fertilizers effectively enhanced the leafing and growth rates and eventurally accelerated the turf formation, Each nitrogen source significantly increases the biomasses and improves the appearance of the turf. Furthmore, the ability of tilling and summer tolerance are promoted by ammonium sulphate, meanwhile, Urea increases the weight of roots system and deepenes the turf color in Autumn.