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Secondary Plant Food Elements. Calcium Magnesium Sulfur. Calcium. Helps translocation of carbohydrates Essential to healthy cell walls Aids in development of root structures Calcium is active element in lime and gypsum which are used to treat saline and/or alkali soils. Lime & Gypsum. - PowerPoint PPT Presentation
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Secondary Plant Food Elements
Calcium Magnesium Sulfur
Calcium
Helps translocation of carbohydrates Essential to healthy cell walls Aids in development of root structures Calcium is active element in lime and
gypsum which are used to treat saline and/or alkali soils.
Lime & Gypsum
Calcium Deficiency Symptoms
Growing point of plant (terminal bud) dies under severe deficiency
Margins of leaves (usually younger ones) have a scalloped appearance, remaining foliage is abnormally dark green
Plant shedding blossoms and buds prematurely
Stem structure weekend
Calcium Deficiency
Magnesium
Essential ingredient of chlorophyll Deficiency Symptoms:
Leaves are abnormally thin and brittle Curve upward
With acute deficiency leaves may dry up and die
On trees twigs are weak, subject to fungus infection, drop leaves prematurely
Leaves loose their color at the tips and between veins Starts with lower leaves and moves upwards
Magnesium Deficiencies
Sulfur
Component of cystine, a constituent of protein
Aids in the synthesis of oils Deficiency symptoms:
Lower leaves yellowish green Stems are small in diameter and hard and
woody Although roots are well developed, they are
also small in diameter
Sulfur Deficiencies
Conventional Tillage System
Subsoil
Breaks compaction from tillage, wheel traffic, or animals
Aids in water penetration of soil profile Eliminates impermeable layers in soils Should be done when soil is dry for
“shattering” effect Generally 24”-36” deep
Subsoilers/Rippers
Disk Harrow
Breaks large clods from subsoiler Incorporates residue and eliminates weed
growth Commonly 6” in depth
Disking
Disking
Fertilization
Important to incorporate phosphorus and potassium at this stage
Nitrogen assists in breakdown of heavy crop residue
Apply soil amendments based on soil tests so soil can sustain a healthy crop from the start
Fertilizing
Moldboard Plow
Incorporates all organic matter and residue on surface
180 degree inversion of soil Generally 10-12” in depth Aerates the soil Can provide weed and disease control Incorporates fertilizer and soil
amendments deeply Can be accomplished on moist or dry soil,
but not wet!
Moldboard Plow
Moldboard Plow
Plowed Ground
Disk Harrow
Typically with a cultipacker or spiketooth harrow hooked behind the disk
Breaks down large clods from plowing Begins firming process of seedbed Kills weeds and vegetative growth Generally 6” depth
Cultipacker & Spiketooth Harrow
Landplane
Cuts off high spots and fills depressions Smoothes but does not level Should be done with dry, residue free soil
surface
Landplane
Install Borders
Borders are installed for flood irrigation to guide/control even flow of water across field
Generally 18-24” in height (factor 1/3 shrinkage)
Length and width of borders depends on: Equipment width Soil type Water supply
Pre-Irrigation
Accomplished via flood or sprinkler irrigation Addition of water through effective rooting
depth of crop Germination of weeds and volunteer Testing of leveling operations Prepares moist firm seedbed Once weeds have germinated and soil is dry
enough to safely enter field with equipment (7 or more days) , field is disked again and then planted