Effect Of Four Fertilizers On The Growth Of Kentucky Bluegrass Turf

The experiments were conducted in a golf course of Zhengzhou in 2010-2011. The study investigated the effect of three kinds of domestic turf fertilizers and one kind of widely used agricultural compound fertilizer to the growth of Kentucky bluegrass turf, the days of acceptable turf quality, color, density, texture, uniformity, growth rate, ground biomass, underground biomass, and tissue nitrogen content. The results are showed as follows:1. Under the boreal climate conditions, the days of acceptable turf quality increased significantly when using fertilizer. Turf fertilizer excels obviously agricultural compound fertilizer in maintaining turf quality; especially in autumn and winter, turf fertilizer can notably extend the days of acceptable turf quality retard the dormancy of turf.2. The treatments which were treated with turf fertilizer enable the turf grass to stay green for a longer time than treatment treated with agricultural compound fertilizer, especially when autumn changes into winter the temperature is low, turf grass is about to be in dormancy, and prominent differences appears when turf grass turns green in the early spring. The color grading curve of treatment treated with agricultural compound fertilizer has a very distinct fluctuation along with the time of fertilizer during the testing time.3. The density fluctuation curve of turf treated with turf fertilizer are much smoother than that of agricultural compound fertilizer. There are obvious differences in density among treatments all treated with turf fertilizers, at the period of early autumn when grass recover growth, the density grading of treatment treated with turf fertilizer 3 keep around 7.5, until it was fertilized for the second time in the end of October, the density grading reaches 8.4. During the two growing seasons suitable for the growing of cool season turf grass (1st Sep. to 30th Nov, 1st March to 30th June), the blade width for the turf treated with turf fertilizer is mostly between 3.6 to 4.2 mm. The blade width fluctuation curve of treatment treated with agricultural compound fertilizer has some changes.5. Turf fertilizer ensures the turf uniformity sustain at a high level. The uniformity grading of treatment D treated with agricultural compound fertilizer remains very low, besides, every time after fertilization it had a big fluctuation, but the grading is always lower than that of the turf treated with turf fertilizers. 6. The growth rate of three turf grass treated with turf fertilizers do not have very significant differences. Meanwhile, the growth rate curve is smooth. Big fluctuation appear in turf grass treatment treated with agricultural compound fertilizer.7. During the autumn of 2010, spring of 2011, two suitable growing times for cool season turf grass. The treatment treated turf fertilizer 1 growth curve is the most gentle one among all the study targets. Treatment treated turf fertilizer 2 shows an obvious single peak growth trend.8. In the suitable fertilizing seasons for turf grass growth (spring and autumn), treatment treated with turf fertilizer 1 and treatment treated with agricultural compound fertilizer have higher underground biomass. Treatment treated with turf fertilizer 2 and treatment treated with turf fertilizer 3 have the similar underground biomass changes, the fluctuation curve is extremely gentle. The underground biomass of treatment treated with agricultural compound fertilizer fluctuates greatly according to the change of seasons and temperature.9. The tissue nitrogen content of treatment treated with turf fertilizer 1 is very different from others; however, treatment treated with turf fertilizer 2, treated with turf fertilizer 3 and treatment treated with agricultural compound fertilizer did not have very obvious differences during the growing season. When turf grass enters into the dormant, the tissue nitrogen content of the turf fertilizer ones have similar changes trend, meanwhile, the tissue nitrogen content of treatment treated with agricultural compound fertilizer drops greatly, and has very big differences than others.