Effect of planting stage and nutrient management on the growth and productivity of summer rice under system of rice intensification in north bengal condition 

1. Effect of planting stage and nutrient management on the
growth and productivity of summer rice under system of
rice intensification in North Bengal condition
Dhiman Sen1, S. K. Maity1* and P. Mukhopadhyay2
1Institute of Agriculture, Visva-Bharati University, Sriniketan 731236
2Directorate of Extension, Uttar Banga Krishi Visvavidyalaya, Cooch Behar
*E-mail: swapankumar.maity@gmail.com

2. Objectives of the study
• To compare the performance of stage of seedling
transplanting of rice under SRI during dry season
crop.
• To explore the possibility to compensate the
productivity of rice under SRI with inoculation of
Azospirillum along with lower rate of FYM
application.
• To study the effect of real time N management on
growth and productivity of rice under SRI.

3. Location of the study
• Experimental field of Dakshin Dinajpur Krishi Vigyan
Kendra, Majhian, South Dinajpur district, West
Bengal during 2011-12
• At the farmer’s field of Pourahar village, Hili, South
Dinajpur district, West Bengal during 2012-13

4. Soil characteristics of the experimental site
• Texture : silty loam in 2011-12 and silty clay in
2012-13,
• Soil reaction: acidic medium in organic carbon
content, low in available nitrogen, phosphorus
and potassium during both the years.

5. Treatment details
• Planting stage of rice seedlings
1-2 leaved stage
3-4 leaved stage
• Organic source of nutrients
FYM @ 10 t ha-1,
FYM @ 5 t ha-1
FYM @ 5 t ha-1 with Azospirillum inoculation)
• Mode of N application
Blanket split,
Topdressing at LCC 3
Topdressing at LCC 4
The experiment was laid out in completely randomized block design with three
replications.
Variety: IET 4094

6. Average N (kg/ha) applied under different
modes of N application
Treatmentd 2011-12 2012-13
Blanket split 97.54 97.54
LCC-N at 3 90.89 104.33
LCC-N at 4 104.97 110.73

7. Important Findings
• Transplanting of rice seedlings at two leaved stage recorded
significantly better growth attributes such as plant height, green
leaf number, tiller production and dry matter accumulation as
well as yield parameters such as panicle number per hill, panicle
length, panicle weight, per cent filled grain and 1000 grain
weight over transplanting of rice seedlings at 3-4 leaved stage
during both the years.
• The average grain yield obtained under transplanting at two
leaved stage was 5174 kg ha-1 which was 12.4 % higher than the
grain yield recorded with the transplanting of rice seedlings at
3-4 leaved stage.
Effect of stage of rice seedling:

8. Application of FYM @ 10 t ha-1 as compared to its half the
dose maintained its superiority in effect in terms of all the
growth as well as yield attributes with a record of grain yields
of 5539 and 5335 kg ha-1 during first and second year of
experimentation respectively.
The inoculation of the biofertilizer Azospirillum along with
FYM @ 5 t ha-1 had resulted better effect particularly at later
stage of growth of rice plant and finally on yield attributes and
productivity than applying FYM alone @ 5 t ha-1.
Effect of organic source of nutrients:

9. • The productivity of summer rice under SRI was also found to
be improved with the real time nitrogen management aided
by leaf colour chart (LCC) over blanket split application of
nitrogen.
• Applying nitrogen at LCC 4 recorded better growth as well as
yield attributes and grain yield over applying nitrogen at LCC
3.
• The average grain yields recorded with LCC based N
application were 5177 and 4901 kg ha-1 during 2011-12 and
2012-13 respectively which were 8.0 and 7.6 per cent more
over the blanket split application.
• The average grain yield (5126 kg ha-1) over two years recorded
under LCC 4 was 4.8 % higher than the average grain yield
(4893 kg ha-1) obtained with the N application at LCC 3.
Effect of mode of N application:

10. Grain and straw yields as influenced by the planting
stage of rice seedlings

11. Grain and straw yields as influenced by organic source
of nutrients

12. Grain and straw yields as influenced by mode of N
application

13. two leaved stage transplanted + FYM 10 t/ha + LCC 4

14. Conclusion
• Transplanting of younger seedlings had resulted
higher productivity of rice under SRI which
confirmed the already established practice of SRI.
• Application of FYM @ 10 t/ha proved its superiority,
but yield loss due to lower level of FYM application
can be compensated to some extent by the
application of low cost biofertilizer such Azospirillum.
• Real time application of inorganic N based on LCC
could further improve the productivity potential of
rice under SRI.

15. Acknowledgement
This presentation is a part of Ph. D.
thesis work of Mr. Dhiman Sen. The Ph.
D. work is being supervised by myself
and Prof. P. Mukhopadhyay of UBKV,
Cooch Behar, West Bengal.