WELCOME

MAHATMA PHULE KRISHI VIDYAPEETH RAHURI, AffILIaTED

K. K. Wagh College of Agriculture, Nashik-003

Department of soil science

Presentation on

Soil Testing And Fertilizer Dose Recommendation

Presented by

M.K.BORNARE

Introduction

Name of student : Maheshwar Kailas Bornare

Reg. No. : AKN 2011/13

Year : Final year B.Sc Agri.

Course No :- AEL-SSAC-486

Course title : Soil and Water clinic

Module introduction :-

Academic year : 2014-2015

Module title : soil and water clinic Module no. : AEL-SSAC-486

Credit : 0+15

No. of student : 14

Module incharge :Proff. Mrs. P.V.Shinde

Soil testing is defined as inclusions of interpretation and evaluation of the soil test values and fertilizer

recommendation based on the results of chemical, physical and biological analysis and on other

consideration .

SOIL TESTING

Importance of soil testing :-

1) It helps to know the fertility status of soil.

2) It helps to recommend the dose of fertilizer for different crops according to soil test report.

3) It helps to reclaim the problematic soil. 4) It helps to know the properties of soil.

It includes following points :-

Phases of soil testing

Preperation of sample in laboratory for testing

Fertilizer dose recommendation

Soil testing and fertilizer recommeNdation

Phases of soil sample testing

Collecting soil sample.

Extraction and determining the available

nutrients

Calibrating and interpreting the analytical

results

Making fertilizer recommendations.

Collecting soil sample from field :-

• Soil is heterogeneous body

• Hence it is not possible to collect soil sample which would be representative of the heterogeneous land.

• Hence to get composite sample, heterogenity of soil reduced by dividing soil in different units.

• Determination of soil unit

1)Topography :-

If land is undulating the land is divided in to

1)high land, 2)medium land, 3)low land.

2)Colour :-

Dark colour land – high humus content

Light colour land – low humus content.

Therefore land divided in to light or dark land.

3)Texture :-

According to texture of soil, soil is divided in to following units

1) sandy

2) Loam

3) clay

4)Fertility status :-

It is indicated by the previous crops.

1) high yielding

2)low yielding

5)Management unit :- During cultivation, more fertilizers are applied

to the one portion of land than other portions.

Hence it increases the fertility of that portion and yield obtained also increased from that portion.

Hence soil is divide in to two units :-

1)Highly fertilized 2)Less fertilized

Collection of composite sample

For collecting composite soil sample following steps are required:-

1)Cores(in case of auger) or furrow slice(when spade is

used) should have same volume 2) Cores or furrow slice should be taken at

random.3) Enough cores should be taken.

4) In practice usually 8-10 cores are taken but number may increase to 20-30. Increase in number of cores decrease variation in soil characteristics.

Preperation of soil sample in laboratory :-

Drying

Grinding

Sieving

Mixing

Quartering

Weighing

Storing

Drying :-soil samples are dried in shade

at room temperature.Soil samples are dried for soil

chemical reaction when dried samples are more nearly at equilibrium.

Grinding By grinding soil aggregates are broken

up. wooden mortar is the best for avoiding

contamination of other elements from grinder itself.

Crushing of primary sand and gravel particles is avoided.

Sieving 2 types of sieve (20

mesh and 80 mesh) which are used for sieving.

For micro nutrient analysis nylon sieve is preferred.

For organic carbon determination fine sieve is used.

For pH , exchangeable cations coarse sieve is used.

Quartering :- All the samples From same

field are mixed together and

divided into Four equal sized

Quarters, then Two of them

in cross are selected and

other are rejected.

Weighing :- Fine textured soil which doe not tend

to segregate is weighted with the help of analytical balance.

Storage :- Soil samples may be stored in series of

cardboard cups in tray. Placing samples in screw cap jars is most satisfactory.

Places from where samples should not be collected :-

1) Near gates ,building, highway etc.2) Along the field boundaries and

margins etc.3) Under stacks of manure4) Shaded area 5) Crop hills and rows 6) Local abnormal sites (acidic or

alkaline soil )

For Recommendation of fertilizer dose following points should consider :-

Initial fertility status of soil

Cost of fertilizer

Produce potentiality of the land

Availability of fertilizer Crop to be grown 

oFor selection of fertilizer following point should be considered:-

• Soil characteristics• Crop to be grown  

oFor method of application following point should be considered :-

1)soil characteristics2)other factor like crop, type of fertilizer.

For time of fertilizer application following point should be considered

Soil texture

Other factor like crops, kind of fertilizer

Sr.No. Nutrient

Classification

Organic carbon

%

Available Nitrogen(kg/ha)

Available phosphorus(kg/ha)

AvailablePotassium(kg/ha)

Effect on recommended

dose of fertilizer

1 Very low <0.20 <140 <7 <100 RDF increase 50%

2 Low 0.21-0.41 141-280 7-14 101-150 RDF increase by 25%

3 Medium 0.41-0.60 281-420 15-21 151-200 No change in RDF

4 Moderately high 0.61-0.81 421-560 22-28 201-250 No change in RDF

5 High 0.81-1.0 561-700 29-35 251-300 RDF decreased 25%

6 Very high >1 >700 >35 >300 RDF decreased by 50%

Chart Of Fertilizer Dose Recommendation

Thank

You !!!