CROP HUSBANDRY

5.1Describe the major cropping systems.

Mixed cropping, mixed farming, crop rotation

CROPPING SYSTEMS

Farming is any deliberate attempt to produce crops and livestock

Need for an efficient system of farming:• Need for food to live ; land is limited, growing

population• Increase incomes, increase production by farmers• With limited resources in some countries, farmers must

increase productivity to pay for goods and services• Employment is generated• Efficient system of farming makes economic use of

resources

Shifting cultivation

• The land is cleared usually by burning and• planted using simple tools • Relies on natural fertility, no fertilizers.

The land is cleared usually by burning

Shifting cultivation

• A piece of land is cultivated for 2 – 4 years

Shifting cultivation

• When the soil nutrients are exhausted and crop yields are low the farmer and his family abandon the farm and farm buildings for ever and move to farm elsewhere.

Shifting cultivation – the problems

• Loss of humus by burning,• depletion of soil nutrients by continual

removal of crop products

Shifting cultivation – the problems

• causes soil erosion,• flooding, • lost of valuable forest trees and wildlife

Shifting cultivation

Subsistence farmingEarnings are supplemented from other jobs.

It assists with family food requirements.

Subsistence farming

Continuous cropping

•This farming system involves putting a piece of land under permanent cultivation. •The crops planted may either be annual or perennial.

Continuous cropping Advantages:

• Maximum utilization of land,• reduced cost of labour on land preparation, • if water and nutrients are adequate it can lead to

increased production and more than one harvest per year.

• Desirable in densely populated areas where land is scarce and there is high demand for the crops being produced.

Continuous cropping Disadvantages:

• can lead to soil exhaustion, erosion and low productivity if soil and nutrients conservation practices are not adopted.

• Must have good land management practices to be successful

Monocropping (sole cropping)• This is the practice of growing exclusively one

type of crop and harvesting it before planting another on the same piece of land.

• This system leads to specialization and greater efficiency in production of the crop and its products.

Monocropping (sole cropping)

Mechanization is possible because only one set of machinery is required.

Monocropping (sole cropping)

Control of pests and diseases of the crop can be easy.

Monocropping (sole cropping)This system can be adopted• where there is high demand for the crop; • if there is managerial skill for growing the crop; • if there is government incentive through subsidies

for farm inputs; • and where the environmental factors are conducive. • The farmer could however be exposed to the danger

of a poor harvest as a result of adverse climatic conditions or invasion of pests and diseases.

• The market price may also fall causing serious loss to profit margins.

Monoculture• This means the

growing of the same crop on the same piece of land from year to year.

• This may apply both to annual crops such as yam, cassava, rice, corn, and perennial crops such as cocoa, coffee, coconuts, citrus.

Monoculture

• After some years the crops will diminish in yield because the same nutrients will be continually removed from the same or nearly the same depth of soil by the plants.

Monoculture - Advantages

• encourages specialization in certain crops that could lead to better production both in quantity and quality.

• The farmer can purchase specialized tools and equipment.

• It is advantageous when a specific crop commands a high price;

• when the soil is suitable for one crop such as swamp rice;

• when manure is readily available to replace steady losses through plant uptake.

Monoculture - Disadvantages

• This will lead to soil exhaustion; • the destruction of soil structure, • and possibly soil erosion. • It is also a system that exposes the farmer to

great risk in the case of adverse climatic conditions or an invasion of pests and diseases.

Mixed Cropping

• Mixed cropping is the cultivation of more than one type on a piece of land at the same time.

• E.g. corn and yam

Mixed Cropping

• Makes efficient use of soil resources

Mixed Cropping

• mechanization may not be possible

Mixed Cropping

• the increased biodiversity decreases weeds, pests and diseases.

• Less pesticides used

Mixed Cropping

Mixed Farming

Cows and sheep grazing together

Mixed Farming

• This system involves the rearing of livestock and planting of crops

Sheep and orchard (fruit trees)

Mixed Farming

• Land is used more efficiently and reduces the risk of failure

Cattle grazing under coconut trees

Mixed Farming• Excess from the garden is fed to the animals• Excreta and litter (manure from the pens is used in

the garden

Waste from chicken used to fertilise algae growth in the pond

Mixed Farming - Disadvantages

• A higher level of management is required• A labour force needs to be trained • There is need to find markets for

different produce• Animals can damage crops if they are

not properly enclosed or tethered

The Plantation System

• Involves a large acreage cultivated with one main crop. E.g. sugar cane

• Several employees, many technically trained

The Plantation System•Highly mechanized•May have own research station and security force

Rice – main crop

Crop Rotation• This is a system whereby the ground is kept

under cultivation in such a way that the crops follow in a definite order or cycle.

Crop Rotation• Some crops use a fair

quantity of nutrients, e.g. yams, maize, cassava; while some use less. E.g. tomatoes, pumpkin.

• Crops add nutrients, e.g. legumes, grasses

Crop Rotation•Crops have different root lengths – shallow rooted and deep-rooted.

Example of Crop Rotation

beans

lettuce

carrots

tomato

Benefits of Crop Rotation

• Improves fertility• Controls pests and diseases• Controls weeds• Labour is occupied throughout the

year• Income is maintained throughout the

year

Intercropping

• The planting of quick-growing and quick-maturing crops between slow-growing and slow-maturing crops. E.g. melon and yam.

Sorghum and cowpea

Intercropping

Nine different crops growing here

Intercropping

Interplanting• the growing of a main

crop in between planting of another main crop on the same piece of land.

• The crop planted later remains on the plot after the first crop has been harvested. E.g. corn and cassava.

HOME WORK

Read pages 166- 168

THE END