diagnosis and recommendation integrated system

1. T.C.B CARS,BILASPUR,
chattisgarh.
Presented To; Presented By;
Dr. YUSHMA SAO SHEKH ALISHA
Dept. of Soil Science B.Sc. Ag 2nd yr 2nd sem
SESSION -2015-16
DRIS METHOD

2. • DRIS is a new approach to interpreting leaf
or plant analysis which was first developed
by “BEAUFILLS” (1973) named as
Diagnosis & Recommendation Integrated
System (DRIS) which considers nutrient
concentration ratios rather than individual
elemental concentration for interpreting
plant tissue composition.

3. • The DRIS approach measures the relative
balance between nutrients by means of
index values with negative values
indicating insufficiencies and vice versa.
• DRIS reveals not only the limiting nutrient
but also the order in which the nutrients are
likely to become limiting.

4. • It is a comprehensive system which
identifies all the nutritional factors limiting
crop production and in doing so increases
the chances of obtaining high crop yields by
improving the fertilizer recommendations.
• Index values which measure how far
particular nutrients in the leaf or plant is
deviating from the optimum are used in the
calibration to classify yield factors in the
order of limiting importance
• There will be positive and negative values
for the nutrient index.

5. To develop a DRIS for a given crop the following requirements must be met.
1.All factors suspected of having effect on
crop yield must be defined.
2.The relationship between these factors and
yield must be described .

6. 3.Clibrated norms must be
established.
4.Recommendations suited to
particular sets of conditions & based
on correct and judicious use of these
norms must be continually refined

7. • The importance of nutritional balance is
taken in to account in deriving the norms
and making diagnosis.It helps to
quantify the nutrient balance in the plant
• The norms for nutrient content in leaves
can be universally applied to the
particular crop.

8. • Diagnosis can be made over a wide
range of stages of crop development.
• The nutrient limiting yield through
either excess or insufficient can be
readily identified and arranged in
order of their limiting importance for
yield.