Presentation on theme: "EFFECT OF TILLAGE ON PLANT GROWTH MUHAMMAD SARFARAZ 2008-ag-1574."— Presentation transcript:
EFFECT OF TILLAGE ON PLANT GROWTH MUHAMMAD SARFARAZ 2008-ag-1574
WHAT IS TILLAGE THE PHYSICAL MANIPULATION OF THE SOIL FOR THE PURPOSES OF: Management of previous crop residues Management of previous crop residues Control of competing vegetation Control of competing vegetation Incorporation of amendments Incorporation of amendments Preparation of a seedbed Preparation of a seedbed
SOIL PROPERTIES AFFECTED BY TILLAGE Crop residue cover Structure and aggregate stability Effect on soil moisture Soil water retention
Infiltration Effect on evaporation Effect on soil microorganisms Effect on soil nutrient uptake
SURFACE CROP RESIDUE INTERACTS WITH OTHER FACTORS Impact on erosion Cooler soils Conserves moisture Affects soil physical properties
TILLAGE EFFECT ON INFILTRATION No-till maintains large pores Bare soil crusts Infiltration varies during season Wheel traffic influences infiltration
TILLAGE EFFECTS ON SOIL TEMPERATURE Cooler temperatures associated with high residue Residue buffers temperature change Emergence and early growth affected No-till systems have been shown to be 5-10% less productive
Effect on soil moisture Tillage facilitates water penetration into the soil and increase the amount of water retained for crop use later. Excessive shallow tillage operations result in in increase compaction which restrict root growth, air exchange, and also creates problems in soil drainge.
Soil Water Retention Tillage effects soil water retention by changing infiltration and evaporation of water from soil surface. Rough soil surface and depressions caused by tillage decreases runoff.s
Effect on Evaporation Evaporation from the soil is a major pathway of water loss created by tillage. Surface roughness caused by loosening of upper soil layer by tillage increases the area of soil exposed to the atmoshpere and allows greater penetration of wind.
Effect on soil Microorganisms Appropriate tillage practices will improve the soil structure, moisture and temperature which ultimately increase the number and activity of microorganisms.
STRIP TILLAGE OFFERS AN ALTERNATIVE TO FULL-WIDTH TILLAGE
SUMMARY Tillage management can greatly modify soil properties related to soil quality and crop growth Tillage intensity will impact residue management and soil consolidation Many physical and chemical properties are affected Better traffic and tillage management will enhance soil quality