速效氮肥与缓释肥混施对夏季草地早熟禾的影响

通过春季对草地早熟禾(Poa pratensis)草坪施用不同比例(速效肥:缓释肥=1:0,1:1,1:2,2:1,1:3,3:1)的速效肥和缓释肥,研究速效肥和缓释肥混施对草地早熟禾生长及草坪质量的影响。研究结果表明:速效肥与缓释肥混施可以持续改善草地早熟禾草坪的颜色,维持草地早熟禾草坪良好质量,保持草坪草组织内N含量的相对稳定,快速持续地满足草坪草生长所需要的养分。其中缓释肥占1/2时改善草坪颜色效果最佳;速效肥与缓释肥比为1:1或1:2时,草地早熟禾组织中的氮素含量最高且在整个试验周期内保持稳定;速效肥与缓释肥比为1:3时草坪生长速度最稳定。

Effects of Mixed Application of Both Fast-release Fertilizer and Slow-release Fertilizer on Kentucky Bluegrass in Summer

The effects of different proportions of fast-release fertilizer and slow-release fertilizer(0,1:1,1:2,2:1,1:3,3:1) on Kentucky bluegrass(Poa pratensis) turf quality were studied in spring trials at the Beijing seed control station(N 40°00′～40°18′,E 116°28′～116°58′).Results indicate that the mixed application of fast-release fertilizer and slow-release fertilizer can maintain high turf quality as well as good lawn color.Meanwhile,the content of total N in turfgrass tissue can be kept stable in order to quickly and sustainably provide the nutrient needs of growth.The best ratio of the two fertilizers for improving lawn color is 1:1.Further,the content of nitrogen in Kentucky bluegrass was highest and stable during the entire experimental period with a 1:1 or 1:2 ratio of the two fertilizers.Kentucky bluegrass has the most stable growth with 1:3 ratios among the treatments.