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Soil texture The soil textural triangle Soil texture The soil textural triangle

Soil texture The soil textural triangle - PowerPoint Presentation

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Uploaded On 2018-03-10

Soil texture The soil textural triangle - PPT Presentation

The delicacy of clay crystals Soil crumb structure Do not abuse clay Add plenty of organic matter Avoid overcultivation especially rotary cultivation Use lime of gypsum to improve structure Use green manure or mulch to cover the surface ID: 645629

lime soil fertilisers magnesium soil lime magnesium fertilisers cultivation disease organic promotes reliable structure excess phosphorus root clay include

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Presentation Transcript

Slide1

Soil textureSlide2

The soil textural triangleSlide3

The delicacy of clay crystalsSlide4

Soil crumb structureSlide5

Do not abuse clay!

Add plenty of organic matter

Avoid over-cultivation especially rotary cultivation

Use lime of gypsum to improve structure

Use green manure or mulch to cover the surface

Encourage earthwormsSlide6
Slide7

Why soil pH is importantSlide8

A simple soil pH test kitSlide9

Looks impressive but less reliableSlide10

Accurate but can be expensiveSlide11

Iron deficiencySlide12

Magnesium deficiencySlide13

Lowering pH

This may be necessary when growing acid loving plants such as Rhododendrons on neutral or alkaline soils.

Treatment usually has a limited effect and must be repeated.

Acidifying materials include Ammonium sulphate, Sulphur and pine needles.Slide14

Raising pH

This may be necessary to achieve the optimal pH so that fertilisers work effectively.

May help to discourage club root of

brassicas

Hydrated lime and ground limestone commonly used.

Always modify pH after testing the soil pH using reliable test equipment. Slide15

Phosphorus

Associated with promoting root growth and seed germination but also has a vital role in processes involving energy exchange.

Bone meal and superphosphate of lime are popular sources.

Concern has been raised about the sustainability of Phosphorus fertilisers.Slide16

Nitrogen

Promotes leaf and shoot growth

Excess can cause frost damage and susceptibility to disease

Usually does not last long in the soil and is washed out by rain

Taken up as Nitrate but supplied as Ammonia and Urea as wellSlide17

Potassium (K)

Promotes flowering and fruiting

Can increase hardiness and disease resistance such as rose

blackspot

.

Excess can prevent the uptake of MagnesiumSlide18

Micronutrients or trace elements

Needed in small amounts but perform vital functions.

Include Iron, Calcium, Magnesium, Molybdenum, Boron and Copper. Slide19

Types of fertiliser

Organic

Synthetic

Fast, slow and controlled release

Solid

Liquid

Foliar

General purpose

Specialist