The Fate Of Slow-release Nitrogen Fertilizer Application On The Lawn

Scientific fertilization in lawn is the most important way to promote the quality of the lawn, extension the lawn’s green period and reducing environmental pollution. This experiment combined with lawn nutrient management needs of simple, using slow-release fertilizer as the main samples, focusing on logistics of different nitrogen fertilizer, it contains nitrogen ammonia volatilization, denitrification and N2O emissions, and lawn’s absorb condition. Field trials Four treatments, respectively, ordinary urea. treatment U (twice applied. each75kg N/hm2of), slow release urea, treatment PCU30(single basal application,150kg N/hm2). ordinary urea+5%DCD, treatment IU (mix base facilities,150kg N/hm2), and the control, treatment CK (no N fertilizer) the main conclusions of the study are as follows:(1) Changes of lawn soil Nmin are mainly influenced by the nitrate content, the whole growth period of the soil ammonium nitrogen content does not exceed4.5mg/kg.Treatment U has the highest Nmin content, and changed fierce; the soil of treatment PCU30’s Nmin content remained stable moderate and grass clippings are quite with treatment U, it can also reduce the frequency of urea fertilizer, but also ensures the normal growth of the lawn.(2) In the spring and summer growing season, lawns-soil system’s ammonia volatilization loss occurred within15days after fertilization mostly. after fertilization2d ammonia volatilization peak.15days after the ammonia volatilization rate has no significant difference. The ammonia volatilization loss in treatment PCU30, IU and U, respectively, were47.56,36.51and36.79kg N/hm2, and the loss rate were21.10%.13.73%and13.92%. Slow-release fertilizer treatment PCU30did not show the expected inhibitory effect in lawn’s ammonia volatilization loss.(3) Slow-release fertilizer. reduce once time fertilization premise, lower the soil N2O emission and denitrification loss does not reflect, only the treatment PCU30are equal with treatment U. Compared to the lawn fertilizer nitrogen in ammonia volatilization loss rate from13.92%to27.29%, all fertilization treatments, loss rate of N2O emissions range from0.234%to0.328%, denitrification losses range from0.217%to0.440%. far less than the ammonia volatilization loss rate. Therefore, nitrification and denitrification is not the suburbs of Beijing Lawn Soil and Fertilizer Nitrogen loss pathways. In addition, irrigation or rainfall is not the important factors of N2O emissions and denitrification loss of slow release fertilizer. the release rate and release period of slow-release fertilizer in the soil is the key factors of fertilization soil nitrification and denitrification. And in the region of shortage human resources or abundant rainfall, the Slow-release fertilizer PCU30is the better choice for fertilization in the lawn.(4) In the lawn’s growing season, the N import items of soil-lawn growth system, N fertilizer, preplant soil residues of Nmin and soil mineralization accounts is an important proportion of the tall fescue absorption of nitrogen and residual Nmin system N output items. Among them, the soil residue proportion is the largest part, approximately43.63%to56.67%. followed by tall fescue uptake, representing approximately35.00%to42.01%. Does not consider soil Nmin residues before planting, in three fertilizer treatments, treatment IU’s ammonia volatilization loss and denitrification total flux minimum, and the gaseous loss of at least either one-time fertilization, but also to avoid the application of higher prices slow-release fertilizers, it’s the beat way to lower the input costs.