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The Effect of Urea Application on Cool Season Mixed Turf and Nitrogen Fate

Author: ZouZuo
Tutor: NieLiShui
School: Beijing Forestry University
Course: Plant Nutrition
Keywords: Lawn Fertilize Urea Nitrate Leach
CLC: S688.4
Type: Master's thesis
Year: 2008
Downloads: 111
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Abstract

With China's economic development and the improvement of people's living standards, the various types of lawn area of ??dramatic growth in our country, to bring people to a beautiful environment. Fertilization is to maintain and improve turf quality one of the determinants of urea is the main source of nitrogen in lawn fertilization. However fertilization also brings problems of environmental pollution, especially nitrate contamination of groundwater is more and more widespread concern. Nitrogen fertilizer into the lawn ecosystem, part of the plants to absorb the use of part of the residue in the soil, about 10% of the nitrate form of out of the lawn ecosystem, caused by surface water, groundwater pollution. Environmental pollution problem is serious concern in many developed countries, fertilization, but in our country, this area is also less. Therefore, the test for cool-season lawn in Beijing urea application, as well as urea application caused nitrate leaching pollution problems of research and further. A field experiment on Kentucky bluegrass and tall fescue mixed sowing lawn in the spring and autumn, twice urea application. Urea application is divided into low nitrogen the (annual nitrogen application rate of 10g/m2, equivalent urea 25g/m2) of nitrogen in annual nitrogen application rate of 25g/m2 equivalent urea 62.5g/m2), high nitrogen (years The nitrogen rate 40g/m2, equivalent to the average application urea 100g/m2) three fertilization levels, respectively, in mid-May and early October. A period of one year after the study fertilization of growth between the different treatment of the lawn, the lawn-state system nitrate with groundwater leaching, as well as the various forms of nitrogen content in the soil which. The test results show that: the Beijing area ornamental lawn, and urea fertilization about 62.5g/m2, the fertilizer is more appropriate, the lawn plants growing better. Fall compared with the spring, more suitable for the application of urea as top dressing. Within one month after the spring lawn Urea Fertilizer, lawn the underground percolation water nitrate concentration, with the increase in the amount of urea fertilizer increased nitrate leaching losses significantly greater than the fall. Application of urea level and experimental soil total nitrogen, ammonium and nitrate content is not a positive correlation, not fertilization is more, the higher content of nitrogen in the soil. Urea fertilization moderate amount of lawn plants are growing better than of fertilization excessive or insufficient. The urea amount of caused by excessive lawn plant blooms poor permeability of the roots phenomenon, summering prone diseases affect the autumn growth, causing huge loss of nitrate; urea amount is too small, can not be provided to meet the normal growth of plants nitrogen nutrition, limiting the growth of plants, while the color of the lawn can not reach the viewing level.

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CLC: > Agricultural Sciences > Gardening > Ornamental Horticulture ( flowers and ornamental trees) > Garden Plant Cultivation and application technology > Lawns and ground cover plants
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