Effects Of Diffent Stubble Height On Soil Physical Properties,Enzyme Activity And Yield Of Conservationg Tillage Wheat Field

In order to improve the yield of wheat with the sustainability of land resources using,people research the relative influence of wheat yield between different heights of wheat stubble,soil physical properties and soil enzyme activities.Through field experiments and relative laboratory analysis,people set up five different heights of Stubble under no tillage condition,which were 10cm,20cm,25cm,30cm and 40cm.The results showed that:1.The height of stubble within 0-10cm soil layers had a great influence on the soil moisture,while the stubble height had no obvious influence on the soil moisture in other soil layers.The bulk density of wheat Field increases with the increase of soil layers depth in despite of sowing and harvest periods.Meanwhile,comparing with sowing period,the bulk density of soil layer has a relative obviously increase in the harvest period.In the whole growth period,with the depth increase of soil layer,the relationship between different heights of stubble and different temperature of soil is decreasing,the influence of different stubble height on soil temperature gradually decreased.The soil compaction increases with the increase of soil layer.2.In the different heights of stubble height,the enzyme activity of soil will become weaker and weaker with the depth increase of soil layer.In the whole growth period of wheat,the activity of soil urease and catalase will firstly decrease and finally increase;in the different stubble' situations,with the depth increase,the activity of soil urease would decrease.When soil depth was 10-20cm and 20-40cm,the activity of soil saccharase had an obviously decrease.When the stubble height was 10cm and 20cm,there were a great effect of the activity of soil saccharase in each soil layers.with the growth of wheat,the alkaline phosphatase of soil showed a gradual trend which firstly decrease and secondly increases and finally decrease;At the same time,with the deepening of the soil,the activity of soil alkaline phosphatase was gradually decreasing in different height of stubble.3.From the agronomic characters of wheat,the wheat height was the highest when the stubble height was 10cm,the wheat height was the lowest when the stubble height was 20cm,the longest panicle length and the seed number was the treatment of stubble 40cm.However,the highest panicle weight per plant,seed number per plant and 1000 grain weight were the height of the stubble 25cm,of which the 1000 grain weight per plant of stubble 25cm was 10.98%higher than that of stubble 40cm.In conclusion,setting up the stubble of wheat at 25 cm can improve the soil physical properties,maximize the yield and the benefit of wheat under no tillage condition.