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Effects of Tillage Methods and Nitrogen Levels on Soil Microbial Properties and Yield of Wheat

Author: LiHongJie
Tutor: LiZengJia;NingTangYuan
School: Shandong Agricultural University
Course: Crop Cultivation and Farming System
Keywords: Tillage Nitrogen levels Soil microbial properties Soil enzyme activity Wheat production
CLC: S154.3
Type: Master's thesis
Year: 2009
Downloads: 219
Quote: 0
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This test is based on the following Zhu 2006 in Longkou City, Shandong Province, before leaving the village of 2007-2008 continues to expand, Leung-sing 99 selected wheat varieties, mainly in field trials, conventional tillage, rotary, harrow tillage and no-tillage on soil microbial characteristics at different nitrogen levels, the impact of the physical and chemical properties and wheat production to clear farming and the relationship between nitrogen levels and soil bio-microbial properties, soil enzyme activity and soil nutrient and yield, provide a theoretical basis for the realization of low-power efficient cropping patterns. Farming methods and nitrogen levels on soil microbial characteristics of conventional tillage and rotary tiller two farming methods in soil active throughout the 0-20cm soil microbial biomass. Active conventional tillage and rotary tiller two farming methods in the 0-10cm soil layer soil microbial biomass average approximately approximately 19.18mg/kg, 21.57% higher than harrow tillage and no-tillage, respectively, in the 10-20cm soil the average 11.67mg/kg, harrow tillage and no-tillage lower, about 9.45mg/kg; nitrogen fertilization can promote soil active microbial biomass increase 0% N treatment of soil active microbial biomass minimum, with the Shi elevated levels of soil nitrogen active microbial content increased. 0-10cm soil microbial biomass carbon content higher than 10-20cm soil layer. 0-10cm soil layer, the highest carbon content of the soil microbial biomass of conventional farming, conventional farming is conducive to soil microbial biomass carbon fixed followed by rake farming, Shi tillage and no-till soil microbial biomass carbon content of the lowest in 10 no-tillage-20cm soil microbial biomass carbon content is 12.77% lower than conventional farming; soil microbial biomass carbon content decreased with the reduction of nitrogen levels. Soil respiration rate in the whole growth period of wheat showed a single peak curve reaches its maximum at the jointing stage of wheat. 0-10cm soil, no-till soil respiration rate was highest, followed by conventional farming and rake farming, rotary tiller lowest in the 10-20cm soil layer, conventional tillage soil respiration rate was the highest, followed by harrow tillage, the lowest soil respiration rate of the no-tillage, no-tillage than conventional tillage and harrow tillage respectively 6.07% and 5.51%. 0-10cm soil layer, conventional tillage and rotary tillage soil microbial activity, is about 5.18mgCO2/kg/h 10-20cm soil layer, conventional tillage highest soil microbial activity, for 2.75 mgCO2/kg/h, than rotary cultivator, harrow tillage, no-tillage were 4.11%, 12.00%, 8.85% 2 no-till farming methods and nitrogen levels on the physicochemical properties of soil and soil enzyme activity has a high water content, water retention the effect is more obvious; 0-40cm soil layer of soil bulk density has been in an increasing trend during the whole wheat growth, especially in the 0-20cm bulk density increased speed faster, and no-till soil bulk density higher. Rake 0-10cm soil quick highest phosphorus content, 5.7% higher than conventional farming; highest in the 10-20cm of soil available phosphorus content of conventional tillage; 0-10cm soil layer no-till farming the highest nitrogen content than conventional farming high 15.64%, while the 10-20cm conventional tillage of the soil nitrogen content was significantly higher than other treatments; In addition to the rotary cultivator 0-20cm soil total nitrogen in conventional tillage harrow tillage and no-tillage difference between the not significant; each treatment soil organic matter content in the wheat harvest than before planting soil organic matter content, especially the increase in straw for the treatment of soil organic matter content is more obvious, but no significant effect of tillage practices on organic matter content; available phosphorus, alkaline hydrolysis nitrogen, nitrogen and organic matter content tended to decrease with decreasing nitrogen levels. 0-10cm soil layer, rotary with higher soil urease and invertase activity in the 10-20cm soil layer, no-tillage with high urease activity, conventional tillage with higher soil invertase activity; soil urease and invertase activity with the decreasing of the nitrogen levels decline. Farming methods and nitrogen levels on wheat leaf area and yield of wheat jointing to spend the highest leaf area per plant conventional tillage and no-tillage than rotary cultivator, harrow tillage, respectively, 9.00%, 5.52%; Free farming wheat after flowering to maintain green leaf area for a long time, that no-till can delay the aging of wheat; rapid the rotary cultivator wheat grain filling rate, followed by the harrow tillage; wheat leaf area per plant and nitrogen levels were correlated relationship, and wheat grain filling rate is a negative correlation between nitrogen levels, nitrogen levels high energy delay the senescence of wheat plants, green leaves for a long time, but the filling rate is relatively low. Rotary tillage and no-till hectares spike lower, but the average yield of its slightly higher grain weight, rotary tillage and no-tillage than conventional tillage were 10% lower, 5.52%, no significant difference between harrow tillage and conventional tillage production. However, the high nitrogen level, the four farming methods yield difference is not obvious, low nitrogen levels, farming practices impact on yield than conventional tillage and harrow tillage higher, rotary tillage and no-till lower; simultaneously with with nitrogen levels decreased hectares spike, grain number and lower production and a slight increase in grain weight.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil Biology > Soil microbiology
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