| This paper explored the optimized program in different periods of the lawn fertilizer management to provide the better reference basis for other similar climate zones, through study Chlorophyll content,MDA content,CAT activity,Turf-width,height,density,color,uniformity,green stage and other index in different fertilizers application concentration and various fertilizers on Zoysia matrella's growth perfor-mance in different stages (green stage, late green stage, re-greening stage), analysizing using integrated methods, finally selected the appropriate type of lawn fertilizer and concentration, The main conclusions as following:1. Greening period, The trends of Chlorophyll content appeared to decline after the change trend of rise, but higher than that in control, appropriate fertilizer rised fastest, different fertilizers levels (low fertilization, excess fertilizer, appropriate fertilizer) had significant differences compared to the control (P<0.01).The changing trends of MDA content was opposite to the Chlorophyll content, and had high correlation to the types of fertilizer. The content of CAT had significantly different trends to MDA's in different fertilizers treatments. The turf's width increased with increasing fertilization, but had no significant difference (P>0.05); Fertilization frequency had few affects to the width of turf, the date had no significant difference (P>0.05). The turf's density had significant correlations to the type of fertilization, there was different density between different fertilizer treatment, and it had the highest density in fertilizer trials, but about uniformity L1000 was the best (4.5 points). This shows turf grass was very sensitive to the difference fertilizers in growth stage, and difference types and concentrations were significant influence on turf's growth.In growth stage, based on the turf quality comprehensive evaluation:N15 (15kg/ 667m2 of urea under the same name)>L1000>C25 (25kg/667m2 of fertilizer, under the same name)>L500>N25>C15>N30>C30>L250>C10>N10>L1500>C5>N5 > L2000. From the perspective of ornamental turf, N15 was the best; considering the price of fertilizer, L1000 was the most benefits, but easy lost; from persistent, C25 was the best, but slow at the first, too expensive.2. Late green stage, in the Iron fertilization trial Chlorophyll content had opposite trends to controls, there had significant difference (P<0.05), but treatment with chelated iron fertilizer was higher than Inorganic iron. Among this Fe3 (3kg/667m2 of inorganic iron fertilizer, under the same name)treatment had best MDA content, others had signification difference (P<0.05); in the Chelated iron fertilizer trials, E4 and E3 (3kg/667m2 of chelated iron fertilizer, under the same name)was the best, others had signification difference (P<0.05). The content of MDA had different trends to CAT, the date of Chelated iron fertilizer treatment group was higher than inorganic iron fertilizer treatment group in the same stage.In the late green stage, turf's color,uniformity,density had significant difference (P<0.01), about density, overall inorganic iron fertilizer treatment group better than Chelated iron fertilizer treatment group, In the late green stage, the uniformity of turf was similar to the overall effect on the density, worse than green stage.Various fertilizer treatments had delayed the arrival of the late green periods in different degree, specific number of days ranging from 8d-28d. In the inorganic iron fertilizer trials, had delayed the arrival of the late green stage following:Fe3>Fe4> Fe5> Fe2> Fe1; in the Chelated iron fertilizer trials, E4>E5>E3>E2>E1, E2 and Fe3, Fe2 and F5, Fe4 and E1 had no significant difference (P>0.05); there had significant difference between the others.In late green stage, based on the turf quality Comprehensive Evaluation:E4>E3 >E5>Fe3>E2>Fe4>E1>Fe5>Fe2>Fe1.Considering the price of fertilizer, the concentration of 3kg/667m2 inorganic iron fertilizer was the cost, had a certain effect, but unstable; but from the perspective of ornamental grass, the concentration of 4kg/ 667m2 of chelated iron fertilizer combined was the best, but expensive.3.Re-greening stage, In the turf's re-greening stage, chlorophyll content associated with the type of fertilizer, there had significant difference between different treatments, the content of MDA decreased, the content of MDA associated with the different type and concentration of fertilizer, the changes of CAT and MDA had opposite trend, there had largest Fluctuations in CAT content in the urea fertilizer trials, had minimum Fluctuations in the liquid fertilizer trials. Showed upward trend.At the re-greening stage, turf's color, uniformity, density had significant difference. The data of turf s density in green stage was higher than the late green stage. The turf's uniformity was similar to turf's density, higher than the late green stage.Compared with the control, various fertilizer treatments processing the varying degree make green lawn ahead of time, days from 15d-25d. Among the three fertilizer treatments, nitrogen fertilizer was better than others.In re-green stage, lawn of the comprehensive quality for:N15>L500>C25>C15 >L1000>N25>C10>N10>N30>C30>L1500>L250>C5>N5>L2000. Considering the cost of fertilizer prices and ornamental lawn, Re-greened the earliest; 500-fold diluted liquid fertilizer cheap, but easily lost; 25kg/667m2 of lawn fertilizer longer the green stage, but expensive than the other two. |
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