草坪草叶面喷施尿素的耐受性及吸收作用

Studies on the Toleration and Adsorption of Spraying Urea on Turfgrass Leaf Surface

通过对不同浓度尿素的喷施试验，得出草坪草叶面喷施尿素的最佳浓度在３％左右。喷施尿素后，草坪草叶片立即大量吸收氮使叶内含氮量迅速增加。在一定范围内，喷施浓度越高，吸收量也越多，吸收也越快。各草种叶片对氮的吸收能力有差异。草地早熟禾、结缕草、野牛草在喷后第１天和第５天有２次吸收高峰，白颖苔草只呈现１次高峰。

The results of spraying urea with different concentrations on turfyrass leaf surface showed that the urea concentration was 3%. When concentration is higher than 3%, leafapet became wilt and yellow and leaves suffered injury; while less than 3%, the effect is not obviouly . After spraying urea, the leaf of turfgrass absorbed lots of nitrogen immediatly and the nitrogen content in leaf increased quickly. In certain rang, the higher the chemical concentration is the larger and faster the nitrogen is absorbed and the ability of nitrogen absorption in different grasses was different. Kentucky bluegrass, Zoysia and buffalo grass have two highest absorbing peak in the first and the fifth days after spraying respectively, while carex rigescens only present one absorbing peak.