Effect of variety, spacing and n levels on yield of rice under sri method in imphal valley

1. EFFECT OF VARIETY, SPACING AND
N LEVELS ON YIELD OF RICE UNDER
SRI METHOD IN IMPHAL VALLEY
Prof. L. Nabachandra Singh
CENTRAL AGRICULTURAL UNIVERSITY
IMPHAL

2. MANIPUR AT A GLANCE

3. 1. Area : 22,327 sq. km. (90 % hills & 10 % ( valley)
2. Location : 93º03´ to 94º78´ E longitude
23º83´ to 25º68´ N latitude
3. Altitude : 740 m. to 2994 m. above MSL
4. Climate : Mild tropical to temperate
5. Rainy season : May to October
6. Rainfall : 1500 mm (Annual average)
7. Temperature : 0.5 to 35ºC
8. Humidity : 40 to 100 %
9. Soil : Clay to clay loam(valley),Red lateritic soil (hills)
10. pH : 4.5 to 6.5
AGRO CLIMATE OF MANIPUR

4. RICE IN MANIPUR
• Only staple food crop
• Area : 1.7 lakh ha
• Variety: Mostly glutinous
• Productivity: 2 t/ha (State), 4t/ha (Valley)
• Yield increament : 46.35% (1980s), Static
(After)
• So, high time to find an alternative technology
like SRI

5. SYSTEM OF RICE INTENSIFICATION
• Based on 3 main principles
• Transplanting of young seedlings singly
• Wider spacing
• Wise management of lesser nutrients & water

6. OBJECTIVE OF THE RESEARCH
• SRI came into existence since 2006 in Manipur
• But, whatever technology used is borrowed
• No systemic work is done so far till yet in the
state
• So, the present investigation is carried out with
the objectives of
• 1. To find out suitable spacing for the popular
varieties of Manipur &
• 2. To find out suitable N dose under SRI

7. METHODOLOGY
• Experimental site: CAU research farm
• Soil: clayey
• Nutrient status : Medium
• Soil reaction: Acidic (5.4 pH)
• To achieve the objectives 2 sets of
experiments are conducted as given below:

8. EXPT. 1: VARIETAL CUM SPACING TRIAL ON RICE UNDER SRI METHOD
Treatment Productive tillers/hill Filled grain/panicle Test wt (g) Yield (q/ha)
Variety
Leimaphou (V1) 31.5 101.0 24.0 47.2
CAU-R1 (V2) 40.7 117.7 27.3 79.9
Pari (V3) 35.0 123.7 25.0 68.8
PAC-801 (V4) 42.5 132.3 28.3 93.5
SEm+
0.32 0.41 0.28 0.63
CD (P=0.05)
0.93 1.21 0.81 1.83
Spacing
25 cm x 25 cm (S1) 35.3 108.0 25.5 76.6
25 cm x 30 cm (S2) 36.8 118.0 26.5 74.3
30 cm x30 cm (S3) 36.3 119.5 26.5 70.4
30 cm x 35 cm (S4) 39.0 126.7 26.3 68.3
SEm+
0.32 0.41 0.28 0.63
CD (P=0.05)
0.93 0.21 NS 1.83
Table1: Effect of variety and spacing on yield attributes & yield of rice under SRI method

9. Contd.
Treatment Productive tillers/hill Filled grain/panicle Test wt (g) Yield (q/ha)
Treatment combination
V1 S1 30.0 97.0 24.0 51.1
V1 S2 32.0 98.0 24.0 50.1
V1 S3 31.0 101.0 23.0 46.4
V1 S4 33.0 108.0 25.0 42.3
V2 S1 39.0 108.0 26.0 83.6
V2 S2 40.0 119.0 29.0 83.0
V2 S3 42.0 118.0 29.0 79.4
V2 S4 42.0 126.0 25.0 73.7
V3 S1 33.0 107.0 24.0 80.2
V3 S2 34.0 123.0 24.0 70.7
V3 S3 35.0 128.0 26.0 63.5
V3 S4 38.0 133.0 26.0 60.7
V4S1 39.0 130.0 28.0 91.6
V4S2 41.0 132.0 29.0 93.5
V4S3 33.0 131.0 28.0 92.3
V4 S4 43.0 136.0 29.0 96.6
SEm+
0.64 0.83 0.56 1.25
CD (P=0.05)
1.86 2.42 1.62 3.63

10. EXPT. 2. SPACING CUM NUTRIENT MANAGEMENT ON SRI METHOD FOR ENHANCING
PRODUCTIVITY OF RICE IN MANIPUR VALLEY.
Treatment Productive tillers/hill Filled grain/panicle Test wt (g) Yield (q/ha)
Spacing
S1 (20 cm x 20 cm ) 33.7 114.2 26.1 6.20
S2 (25 cm x 25 cm ) 36.9 116.1 26.5 7.62
S3 (30 cm x 30 cm ) 37.7 115.4 26.6 6.30
S4 (35 cm x 35 cm ) 38.4 115.8 26.2 6.26
SEm+
0.41 0.50 0.27 0.51
CD (P=0.05)
0.91 1.12 NS 1.14
Nitrogen dose
N1 (40 kg N/ha) 35.3 114.6 25.8 6.45
N2 (60 kg N/ha) 36.4 115.5 26.6 6.77
N3 (80 kg N/ha) 38.4 116.6 27.2 6.67
SEm+
0.41 0.50 0.27 0.51
CD (P=0.05)
0.91 1.12 0.60 NS

11. Cond.
Treatment Productive tillers/hill Filled grain/panicle Test wt (g) Yield (q/ha)
Treatment combination
S1N1 31.7 111.7 25.4 6.56
S1N2 32.5 114.6 26.1 6.08
S1N3 36.8 116.2 26..8 6.06
S2N1 35.4 114.9 25.8 6.90
S2N2 37.2 116.2 26.3 8.46
S2N3 38.1 117.3 27.3 7.50
S3N1 36.9 115.3 25.9 6.04
S3N2 37.4 115.4 26.7 6.24
S3N3 38.8 115.7 27.2 6.90
S4N1 37.1 114.4 25.2 6.12
S4N2 38.5 115.8 26.1 6.30
S4N3 39.7 117.2 27.3 6.36
SEm+
0.56 0.72 0.47 0.72
CD (P=0.05)
1.25 1.61 1.05 1.60

12. CONCLUSION
• From the study it can be concluded that for
medium duration HYV, rice varieties like CAU-R1,
under SRI method a spacing of 25x25 cm was
performing better with higher grain yield
however, for profuse tillering hybrid varieties like
PAC-801 the spacing of 30cm x 35 cm can be
adopted. For nitrogen dose, 40 kg/ha can be
given as it produced statically similar yield upto
80 kg N/ha. At wider spacing higher N dose can
be given. But, the trials need to repeat for
another year for reaffirmation.