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Biodiversity management
Growing “a genetically diverse portfolio of
improved crop varieties, suited to a range of agro-
ecosystems and farming practices, and resilient to
climate change” is a validated means for
enhancing the resilience of production systems
(FAO, 2011). When confronting abiotic changes
(e.g. shifting rainfall and temperature patterns) and
biotic disturbances (e.g. pest infestations), the
level of existing biodiversity (both
functionalxii and responsexiii diversity) can make
the difference between a stressed agricultural
ecosystem and a resilient one. Biodiversity
management is dealt with in module B8.
All major grain crops, including maize, wheat,
rice, and most other crops are often grown in
monoculture systemsxiv that require significant
investments in pesticides and herbicides. The
diversification of crop systems can take many
forms, involving different crop species and/or
varieties (intra- and/or inter-specific
diversification), different spatial scales (landscape,
farm, individual fields and/or crop) and different
time frames.
Integrating multipurpose crop varieties, whose
biomass can be used in a range of combinations
for food, biofuel, feed, and/or fiber, can improve
the functional and productive management on the
farm and be climate-smart. Examples of
multifunctional crops include living fences that
can provide food and feed and serve as
windbreaks. The use of perennial species as
multipurpose crops is discussed in In individual
fields, there are several ways in which the genetic
diversity of crops can be enhanced. These
practices all require that the dates and rates of
seeding be tested locally to ascertain the most
suitable combinations of crops, crop density and
sequencing matter). This is needed to ensure the
crops selected are appropriate for the specific
conditions of each farm system and do not
compete for nutrients, water and light. These
options include:
Different crop varieties of the same species can be
grown in mixtures as one crop (varietal mixtures).
For example, growing a mix of varieties with the
same growing length that can be planted and
harvested at the same time, but that respond
differently to different water regimes, is a strategy
to cope with the unpredictable onset of the rainy
season and increase the stability of yields.
The VARIETY is a group of plants that are
distinct from other groups and its identifying
characteristics are constant in time and space
Improved varieties give high yield whenever they
are planted under the recommended management
practices in their adaptation areas. Improved maize
agronomic practices include land preparation,
planting time, plant density (seed rate, and
spacing), fertilization (type, rate and method),
weed control, cropping systems and soil and water
conservation. Therefore, maize producers should
strictly follow the recommended management
practices to exploit the yield potential of the
improved varieties.
Sowing
Sowing is the placement of a specific quantity of
seed in the soil at optimum position for
germination and growth
And before the soil dries up.Off season tillage don
e with pre season rainfall causes more conservatio
n of moisture and also enables early and timely so
wing.
1. Broadcasting: In broadcast method the seeds
are spread uniformly over well-prepared land.
Broadcasting may be done by hand or mechanical
spreader. Broadcasting is suitable for close-
planted crops that do not require specific crop or
plant geometry. It is used when the number of
plants per unit area is more important than definite
spacing from plant to plant. This is the usual
method of sowing.
2. Drilling: drilling is the practice is of dropping
seeds in rows or lines. Crops such as wheat,
barley, mustard, carrot and sesame are sown by
drilling.
3. Dibbling or planting: This method consists of
putting or placing individual seed or seed material
in a hole or pit, made at pre-determined depth and
spacing by manual labor or with the use of
mechanical dibbler or planter. Generally, the crops
with bigger size seeds and those needing wider
spacing and specific crop geometry for their
canopy development are sown by this method.
This method is suitable to plant crops like maize,
cotton, sun flower, sugar cane, etc
Planting equipment
A wide range of crops are grown in the Ethiopia,
all with various characteristics and requirements.
There are a range of sowing and planting
equipment available to satisfy the planting and
sowing needs of all crops. These equipments can
be categorized into three different types:
Broadcasters
Drills
Planters
The equipment must have:
Accurate metering to ensure the required
plant population is achieved
The ability to sow the seeds/plant into a
range of soil conditions
The ability to handle a range seed/plant
sizes
A range of easily adjustable sowing rates to
suit a range of crops
Uniform sowing/planting depth
Sufficient hopper capacity to maintain
output
Most of the field crop can be established by
direct sowing but some are transplanted (e.g.
rice)
The term transplanting is used when vegetative
part are used for planting materials
The establishment of good plant stand depends
up on different factors:-
Time of sowing: - factors affecting time of
sowing are
Rain fall: - planting should be done in moist soil
to allow rapid seed germination or sprouting.
Excessive rain fall at planting time may cause
water lodging and should be respond to optimum
rain fall
Temperature: - planting should be done when
soil is warm enough to permit rapid germination.
In dry areas To adversely affect seedling
emergency but optimized by mulching
Day length:- the crop should be normally planted
at time that will permit the appropriate
photoperiod to exist at flowering
Disease and pest prevance:- adjust the time of
planting when disease and pest of crop are less
prevent
Marketing situation
Availability of labor and equipment
Time taken to maturity :- depend on crop
duration
Seed rate: - plant population is the total number
of plant per unit area; it is required for utilizing
water, nutrient, light and carbon dioxide
Factors affecting /influencing seed rate
Size of the seed for bigger seed more seed is
required and reverse is true for fine and small
seed
Fertility of the soil:- high soil fertility is requires
less seed rate
Size of cultivars: - crop variety having tillering
capacity requires less seed rate. Dwarf cultivars
requires more seed rate than tall cultivars
Sowing methods:- broad casting planting
method is requires more seed
Amount of moisture available:- high moisture
less seed rate
Number of crop grown together:- inter cropping
Relation ship of spacing, seed rate and plant
population
To minimize the production cost by avoiding
loss of time, labors and seed plant population
should be calculated before planting
Calculation of plant population; - if maize is
planted at spacing 60cmx20cm
The area taken by a single plant will be
0.6x0.2m = 0.12m2
A plant population for 1haor 10000m2
Will be = 10000m2 = 83333.3p
0.12m2
Sowing depth:- optimum depth of sowing is
needed for better utilization of soil moisture,
avoid bird damage and it is important for quick
and uniform germination
Seed size :- large seed need deeper depth and the
reverse
Soil type :- sand soil need deeper and clay soil
shallows
Moisture status of the soil:- under drier condition
seed should be sown deeper
Methods to maintain sowing depth
Field should be wall prepared and leveled
For dibbling and drilling the depth must be the
same
The cover of the soil should be the same
Sowing with adjusted planter
Types of germination
Hypogeal germination requires deeper depth
Epigeal germination requires shallow depth b/c
it push cotyledon on up the surfaces
Sowing methods
Seeding position with respect to the prepared
land depends on nature of the crop and climatic
factors
Drilling
Dibbling
Broadcasting
Fertilizer Application
Fertilizer: - is chemical or non-chemical
substances that applied to the soil to give certain
element essential for plant growth or any organic
or inorganic material of natural or synthetic
origin add to the soil to supply essential element
for growth of plant.
The object of applying fertilizer: -
Fertilizers are applied to the soil to promote
greater plant growth or better crop quality,
To maintain soil fertility and indirectly reduce
soil erosion.
Crops need two kinds of elements.
The mineral elements:- such as N, P, K, Ca, Mg,
S, Fe, Cu, Zn, Mn, Mo, Cl, B, Si, and
Non-mineral elements such as C, H, O. The
mineral elements can be got mainly from the
soil, non-mineral elements can be got from the
air and soil water.
Importance of fertilizer application
In soil there is a limited source of nutrients
which not able to supply enough nutrients
permanently for crop production, so that
applying selected type of fertilizer, at proper
recommended dose ,at proper time and method is
important to composite the nutrient that take by
plant to maximize the quantity and quality.
Types of fertilizer: - generally there is organic
and inorganic fertilizer
Organic fertilizer
Bulky organic manure:-
Animal dungs mixed with stalks, leaves of trees,
branches of trees, grasses, fodder wastes, urine,
washing water,and soil(about 15%) etc.
Piled in a manure pit, until it is well rotted
(about 2-3 months in Ethiopia ).
This is bulk organic manure, includes such as
farmyard manure( FYM )and Compost, Sledges
Has direct effect on plant growth on the humus
content of the soil, so it improves soil
physical property and microbial activity in the
soil
animal manure
Type of Bulky organic manure
FYM-
it produced from animal excreta, so it is also
called
Compost :-
A wall rotted vegetable matter which, produced
from farm and town refuse
A mass of rotted organic matter made from
waste is called compost. The compost made
from farm waste like sugarcane trash, paddy
straw, weeds and other plants and other waste is
called farm compost
The greatest advantage of compost over other
organic fertilizers is that it can be made fairly
easily at home
Concentrated organic manure:-
All kinds of animal dungs only, such as cow
dung, chicken dung, pig dung, human
excrement and human urine.
It should be well rotted (about 2-3months)
A manure which are organic in nature and
contain higher percentage of N,P, and K than
the bulky organic manure
Bio-fertilizer :-
It includes microorganisms like bacteria, fungi
and algae which are capable of fixing
atmospheric N or convert insoluble phosphate in
soil into forms available to plant
It is environmentally friendly and supplements
chemical fertilizer
Green manure: -
The practice of plowing or turning the sowing
plant at their early stage for improving the
physical condition or nutrient status of the soil.
Are plants which are grown to improve the
structure and nutrient content of the soil
Importance of green manure
Greater soil fertility
Green manures recycle nutrients and add organic
matter to the soil
The nutrients are taken up by the green manure
and held inside the plant.
Improved soil structure
Green manures improve soil structure, letting
more air into the soil and improving drainage.
Green manures help sandy soil hold more water
and not drain so quickly.
Prevention of soil erosion
Green manures help to stop the soil being carried
away by wind and rain.
The roots penetrate the soil and hold it in place.
Weed control
Bare soil can become quickly overgrown with
weeds which can be difficult to remove.
Green manures cover the ground well and stop
weeds growing,
Inorganic fertilizer
A fertilizer that produced commercially by
human
Are chemical fertilizers made in chemical
fertilizer factory
It may contain -N in the form of NH4, NO3
P in the form of P2O5
K in the form of K2o5
Depend up on the amount of nutrient found in
the fertilizer Commercial fertilizer can be
Straight/ single or Complex /compound
Compound fertilizer/ Complex:-a kind of
fertilizer contains at least two or more nutrients
in it like DAP.
Straight/ single:-a kind of fertilizer contains only
one nutrient in it like UREA, TSP.
Soil amendments
Soil amendment is correcting the acidity or
alkalinity of the soil
In high RF areas due to the leaching of base,
acidic soil is formed in while, in low rain fall
areas arid and semi-arid condition saline and
alkaline soil occur
Types of soil amendment
Lime:-Material used for amending/ to remake
acidic soil
Gypsum:-Material used for amending/to remake
alkaline soil
Cellulose gum:-Soil aggregating agents or soil
conditioner that stabilize soil aggregate & to
form granule structure.
Criteria of fertilizer selection
Cost of fertilizer related to value of crop
For the crop having low income from the
market , fertilizer having low price should be
se4lect , in order to maximize the profit
Character of fertilizer
For traditional way of production fertilizer
haven’t volatility problem should select than
fertilizer having volatility problem
Fertilizer which can be applied easily with out
high technique should be selected e.g. fertilizer
appied with foliar application method require
high technique than side -dressing
Rate /amount of fertilizer application
To maximize the productivity of the land proper
dosage, rate , fertility status of soil is important
factors
Factors determine level of fertilizer
Moisture status of soil:-
In moisture area more fertilizer applied
To some extent, nutrients of soil will be leached
such as nitrate nitrogen and potassium
Or washing away such as N, P, and K by the
rainfall,
So the higher the rainfall, the more the
compensation.
Type and growth stage of crop :-
Different crop type requires different kinds of
fertilizer and also at early and mid growth stage
nutrient requirement is higher than late stage.
crops absorb different amount of nutrients at
different stage:
At the former (seedling) stage about 10%-
20%;
At the mid (form jointing or branching) stage
about 50%-60%;
At the later (from heading) stage about 20%-
30%.
Fertility status of soil:- On fertile soil need
light fertilizer
Yield ability:-the higher the yield, the more the
nutrients are taken up, so more compensation
need to be made to the higher yield giving field
crop.
Plant density:- the higher the density of the
plant the more the fertilizer applied
Fertilizer ratio
Is the amount of nutrient found in a specific
fertilizer type
N P K
DAP = 18- 46 -0
UREA = 46 -0- 0
STP = 0- 46- 0
Recommended dose of commercial fertilizer for
field crop
Time of fertilizer application
Time of fertilizer application depends on:-
Type of nutrient / natures of fertilizer
Fertilizer are applied
Before sowing;
Some of water insoluble P fertilizer such as rock
phosphate should be applied 2-3 week before
sowing.
this enable conversion of water in soluble form
of P to soluble form for efficient crop utilization
B/c as such form of fertilizer require time to
change in to utilizable form and it require in
grater quantity during the early growth and seed
development.
It stimulate early root development & growth
it stimulate flowering and aid seed formation b/c
of there is no loss of P through leaching and
volatilization and because of P fertilizer becomes
available to the plant slowly full dose of P is
always recommended before sowing
After sowing;
Application of fertilizer after the crop
establishment is called top dressing.
N-fertilizer (UREA) is leached when at wet and
volatilized when at hot condition.
So split application is necessary to reduce the
risk of N loss
Split application;
The application of the recommended fertilizer
several times in growth season
The number of split is governed by factor such
as;-
Total N to be applied:- if the total amount of
fertilizer is more the number of splitting also
more
Crop duration:- for a crop having long maturity
time the splitting become more
Critical stage of growth:- applying the fertilizer
by splitting should be at different critical stage
in the case of maize crop at Seedling stage, Ear
stage (flowering stage)& Grain stage
growth stage of crop: -
Seedling stage: According to the weather, soil,
seedling condition to produce sound seedlings.
Ear stage (flowering stage)
Method of fertilizer application
All applied fertilizer doesn’t ensure that it will
be taken up by the plant
it is important to place some of the fertilizer
where it will be intercepted by the roots of the
young plant and to place bulk of the nutrient
deeper in the soil
Nitrogenous fertilizer is easily soluble in water,
have mobility it can be applied on the soil
surface
Phosphors & Potassium fertilizer;-move slowly
from the point of placement.
It should be placed closer to plant root
Method of fertilizer application
Broadcasting;-
The fertilizer is spread over the entire soil area to
be fertilized with the main objective of
distribution whole quantity of fertilizer evenly
and uniformly and incorporated in to the tilling
layer
Generally the fertilizer requires in large quantity
is broad casting
Placement; -
Whenever small quantity of fertilizer are applied
placement is practice.
This method is practiced in wide spaced crop
&the soil having low fertility
Placement is done in several ways like band
placing, hill placement, row and spot placement
Band placement;-
The application of fertilizer in to the soil close to
the seed or plant when relatively small quantity
of fertilizer is applied
It assure of an adequate supply of nutrient to
young plant root it promote rapid early growth it
reduce fixation of P&K
Hill placement;
Fertilizer are placed close to the plant when plant
to plant spacing is relatively high (100cmor
more) this method is more effective for fruit
plant
Row placement; -
the fertilizer are put in continues band on one or
both side of rows when plant are sown close
together in row this method is used for
potato ,maize &sugarcane etc
Top dressing; -
applying fertilizer in standing crop
Care must be taken not to spared fertilizer on
wet leave other wise this may burn or scorch
It is practiced for close spaced crop and mostly
N is applied through this method
Foliar application
The spread of nutrient on leaves of growing
plant with fertilizer solution
N and micronutrient are applied as foliar
application
This method is good in correcting
micronutrient
deficiencies
Furtigation; - fertilizer are applied through
irrigation water
Often used in the well developed area with
high cost investment
Side dressing; - the fertilizer is spread between the
row or around the plan
Weed management
Defn: - weed is:-
A plant which grow the place where it is not
needed
Or it is a plant out of place
Or a plant that can be growth with out the
interest of farmer
They are unwanted, useless, prolific (they have
a potential to produce a large amount of seed
per a single plant ), competitive and often
harmful to total environment
Characteristics of weed, which enables them to
compute with crop plant
1. Their capacity to produce a thousands of
seeds per plant
2. The ability to flower and produce seeds in
a short period of time
3. Efficiency of their seed dispersal (wind,
animal ,mechanical, water and human)
4. The presences of allele-chemicals, which
inhibit the growth of crops such as partinium
5. The ability to survive in wide range of
environment
The harm full effect of weed on crop plant
It reduce yield by competing for nutrient,
water and light.
It reduce yield by releasing toxic
substances or exudates, which inhibit crop
growth these called Allelopathy effect
They serve as reservoir for crop pest and
disease
They may poisons to livestock or man
They delay maturity and slow down
harvesting process
They reduce crop quality by contamination
They create injury on plant part b/c some
weed are parasitic in nature like striga, sciatica
in maize
Closing of irrigation cannels
Conventional Agriculture
Crop production in monoculture Sustainable agriculture
by using high yielding varieties, Approach of integrated
chemical fertilizers and pesticides; environmental soundness,
factory farming of livestocks economic profitability and social
equity
Cost Items Co L Co L Co L Co L
st L st L st L st L
S S S S
h h h h
a a a a
r r r r
e e e e
% % % %
Seed Cost
($/acre)
Fertilizer Cost
($/acre)
Herbicide Cost
($/acre)
Insecticide Cost
($/acre)
Fungicide Cost
($/acre)
Custom
Application Cost
($/acre)
Scouting &
Other Cost
($/acre)
Irrigation Fuel
Cost ($/acre)
Tillage &
Harvest Fuel
Cost ($/acre)
Variable
Harvesting Cost
($/unit)
Variable
Harvesting Cost
($/acre)
Boll Weevil
Cost ($/acre)
Labor Costs
($/acre)
Cash Lease Rate
($/acre)
Crop Insurance
Information
Type of
Coverage
Yield Coverage
Price Coverage
Premium
Hail Exclusion
(Y/N)
Hail Insurance
(Y/N)
Other Crop
Information
Irrigation
Method
Gene Type
Planting Pattern
Purpose
Practice
Environmental
3.7 Gross margins of profit market prices and
cash flow bud
Gross margins, market prices, and cash flow are
all crucial aspects of a bud cropping plan. Here’s a
brief explanation of each:
Gross Margins: Gross margin is the difference
between the revenue from the sale of the crop and
the variable costs associated with its production
It’s calculated by multiplying the farm gate price
with yield. Gross margin = Value of
production – Variable cost
Calculating gross margins is essential when
deciding between different enterprises. If a farmer
wants to know whether to continue with a certain
crop or grow another, he or she could compare the
gross margins of the two crops. If a farmer
changes enterprises, the fixed costs will probably
not change. But what will change are the variable
costs and value of production. Using a gross
margin will help the farmer to see if the change in
enterprise will be profitable or not
Market Prices: Market prices are determined by
what buyers are willing to pay for the crop. By
looking at the market as the final destination of
produce, it’s important to take into account what is
called the marketing margin. This is done by
taking the market price and deducting costs, such
as transport or handling, to arrive at the farm gate
price1.
Cash Flow: Cash flow analysis is a method of
tracking how much money is coming into and
going out of your business. This can help you
ensure that you have enough cash to cover your
expenses and make informed decisions about
investments and growth The cash flow is the flow
of money into the farm from sales and the flow of
money out of the farm through purchases. Money
received from the sale of farm produce is called
cash inflow. Money paid out for inputs and
materials used is called cash outflow. The
difference between the cash inflow and the cash
outflow at different times of the year is known as
the net cash flow. Farmers need to consider their
likely cash flow on a monthly or quarterly basis in
order to know whether they will have sufficient
cash when it is required. If the cash inflow is less
than the cash outflow at any particular time all
cash commitments cannot be covered. Cash flow
is not the same as profitability. Remember, profit
is based on the value of production less the
variable and fixed costs. However, if the farm
family consumes a lot of the produce, it is possible
that although the farm is profitable, it may not
generate enough cash to cover its cash
requirements. In the previous example on page
Planning these aspects involves estimating the
results of a farming plan, a process known as
budgeting. Budgets are used to decide whether a
proposed plan will effectively increase profits1.
Farmers can use budgets to decide between two or
more alternative enterprises and even to make
whole farm plans.
There are also tools available that can help
calculate basic gross margins, partial and whole
farm budgets, and farm cash flow analyses. These
tools can be particularly useful in planning and
managing a bud cropping operation.
Estimate gross margins and choose enterprises
Estimates are made of the income and variable
costs for each of the possible alternative plans.
These estimates are used to calculate gross
margins. Based on the gross margins and other
factors, the most profitable and viable enterprises
should be selected. The gross income is made by
multiplying the farm gate price with yield. By
looking at the market as the final destination of
produce, it is important to take into account what
we have called the marketing margin. By taking
the market price and deducting the costs, such as
transport or handling, the farmer can arrive at the
farmgate price. The gross margin for each
potential enterprise should be calculated on a per
unit basis (hectare, person-day).
The gross margins should be prepared on the basis
of the most limiting resource. If land is limited, the
enterprises giving the highest gross margin per
hectare would be best. If labour is limiting, the
enterprises giving the highest gross margin per
person-day would be the best. If capital is
identified as the limiting resource the plan giving
the highest gross margin per $100 of capital would
be the best.
Usually a farm plan is for one year, and costs
related to land, family labour, and machinery are
considered fixed.
Therefore, in the short-run, maximizing gross
margin is similar to maximizing profit (or
minimizing losses) because the fixed costs are
constant.
Formulate Goal
And Objective
The planning
process