Combined Impacts Of Cultivated Technique And Fertilization On Soil Penetration Resistance In Slope Farming System

The fact that China's per capita arable land is small causes sharp contradictions between people and land,making many sloping land resources developed into sloping arable land.and reuse of light management habits.As a result,soil erosion and degradation of most slope farmlands are serious.With the continuous development of agricultural mechanization,the increase of soil bulk density and soil compaction on slope farmland has intensified,and the agricultural sustainability of slope farmland has gradually become the focus of attention.Changes in tillage practices and fertilization practices may help alleviate this soil degradation.This article takes Zhanjiang Academy of Agricultural Sciences South China Slope Cultivated Land as the research object.Using a combination of field measurements and laboratory tests,through the determination of soil penetration resistance index changes,to understand the effects of farming methods and fertilization on soil stability.Taking sloping cultivated land in South China as the research object,The experimental fields set up tillage(20cm)+ deep plowing(30 cm)and deep plowing(30cm),NPK,NPK+OM surface fertilization,NPK+OM deep fertilization of three fertilization methods,a total of six different treatments,through field positioning observations and indoor simulation experiments,explored the impact of different tillage methods and organic fertilizers on soil penetration resistance,and provided more reasonable methods of cultivation and fertilization.This study has obtained the following results:Field measurement results shows:The soil penetration resistance state of the field soil shows a virtual state under the condition of virtual reality,and the variation of the soil penetration resistance of the upper layer soil varies within the range of0.2-1.2 MPa,and the range of variation is not large.The variation of soil penetration resistance of subsoil layer soil was between 1.2-2.4MPa,and the change process was obvious,and the amplitude was relatively large.With the decrease of water content,the penetration resistance of field soil gradually increased,and it showed obvious in0-10 cm soil layer.Tillage(20 cm)+ deep plowing(30 cm)farming methods methods had significantly higher penetration resistance in field soils than deep plowing(30cm),and deep plowing(30cm)combined with organic fertilizers was more conducive to reducing soil penetration resistance.Indoor laboratory analysis shows:(1)Between different tillage methods,deep plowing(30cm)farming methods are more conducive to the accumulation of organic carbon;The p H of the soil becomes acidic,and as the p H of the soil becomes smaller and smaller,the difference between the treatments is not significant.The test plots have a bulk density of 1.52-1.88 cm-3,and the bulk density increases with the deepening of the soil layer.Deep plowing(30 cm)and organic manure application are more conducive to reducing the soil bulk density.(2)The soil aggregates balanced at different water pressures of-50 hpa and-300 hpa for 4 days,the soil penetration resistance of the soil increased with the depth of the soil,and the penetration resistance of the soil under this water potential reached 2.0 MPa or more.Seen from different farming methods,Tillage(20 cm)+ deep plowing(30cm)> deep plowing(30cm);the combination of deep plowing(30cm)and organic fertilizers can reduce the soil penetration resistance.(3)After the soil is crushed,the penetration resistance of the surface soil can be reduced.Deep ploughing(30 cm)with mechanical fertilizer deep application can reduce the penetration resistance of the soil after the soil is broken.(4)Simulated compaction increases the penetration resistance of the soil,and the combination of Tillage(20 cm)+ deep plowing(30 cm)and mechanical compaction results in a significant increase in the penetration resistance of the soil,The highest penetration resistance of deep plowing(30cm)is lower than the lowest penetration resistance value of Tillage(20 cm)+ deep plowing(30 cm);there is no significant difference between the different fertilization methods after compaction.(5)The correlation analysis found that the penetration resistance of soil was negatively correlated with water content and organic carbon,and was positively related to the bulk density.The results of this study indicate that different tillage methods and fertilizationmethods will affect the soil penetration resistance.deep plowing(30 cm)methods and organic fertilizer application will help reduce soil penetration resistance and improve soil degradation.