CHAPTER 4
uSO .53 55 •59
4
'1
8
- - -J
iFi II I I I I I
35 DAT 45 DAT 75 DAT 90 DAT
so= 0 dS&, Sir) dSnr', Sr 6 dSnr'and Sq= 9 dSm1
Figure 1. Effects of salinity on plant height at different stages of BRR1 dhan29
l-lasanuzzanian ci aL (2009) observed that plant height is negatively influenced by the increase of salinity levels in the rice varieties.
Effects of potassium (K)
The plant height of BRRI dhan29 differed significantly due to the different doses of K as foliar application over all the levels of salinity (Figure 2).The highest plant height at 35 DAT, and at 90 DAT (56.72 and 95.94 cm respectively) by K2 and 45 DAT,75 DAT ( 66.88. 89.94 cm respectively ) was given by K2 (0.5 mMK foliar spray and 2/3rd soil application of total MoP fertilizer) and the shortest plant height at 35 DAT, 45 DAT. 75 DAT (50.13.63.61.79.91cm respectively) was obtained by Ko and 90 DAT (89.52 cm) was obtained by k,. (Figure 2 &
Appendix V)At 35 DAT, the highest plant height (56.72 cm) was observed from the K2 treatment which was statistically similar withK 5(55.37cm) and Ki .1(55.47 cm ),at 45 DAT the highest plant height (66.88 cm) was observed from the Ks treatment which was statistically similar with K1 (64.96 cm). Ki 5 (65.53 cm ) and K2 (66.41 cm) whereas, the lowest plant height Ko (63.61 cm) was observed that the treatment which was statistically similar with Ki (64.96 cm). Ki s (65.53 cm). At 75 DAT. the highest plant height (89.10 cm) was observed from the Ks treatment which was statistically similar withKj (87.90 cm) and Ki.s (86.72 cm). It was found that where 2 mMK was applied the plant height was higher than other treatment at different stages.
K0 tj (0.5 (1 K1.S UK?
Ka no foliar application of K ,K.5 = 0.5mMK as foliar application. K1 = I mM K as foliar application. K1 s 1.5 mM K as foliar application. K2 = 2 mM K as foliar application and in all the treatments. 213rd of total
recommended dose of K (as MoP tèrtilizer) was applied in the soil.
Figure 2. Effects of different fertilization methods of potassium on plant height at different stages of BRRI dhan29
Bohra and Doerffling (1993) observed that the increasing levels of K application improved plant height of both salt tolerant and susceptible cultivars and this beneficial effect of K application under saline conditions may be attributed to its influence on net photosynthesis.
Combination effect of salinity and potassium
The effect of different application methods of K on plant height of I3RRI dhan29 at different salinity levels was found significant. (Table 4.1) At 35 DAT the highest plant height (63.27 cm) was recorded in SoK2while at 45 DAT the highest plant height (74.87 cm) was recorded in S0K.s.
at 75 DAT the highest plant height (104.8 cm) was recorded in SoKs(0 dSni4 treated with .5 mMK foliar application of KNO3 and 2/3rd soil application of total MoP fertilizer) and at 90 DAT the highest plant height (100.2 cm) was recorded in SoK1.5 .At 35 and 45 DAT. 75 I)AT, 90 DAT the lowest plant height (44.70,51.27. 59.43, 76.53 cm respectively) was recorded in S9Ko (9 dSm 'treated with 0.5 mMK foliar application of K), At 35 DAT, the highest plant height (63.27cm)
S3Ko.s are observed (63.27, 58.57 cm respectively).
Table 4.1 Combined effect of different fertilization methods of potassium and salinity level on plant height at different stages of BRRJ dhan29.
Treatment Plant Height (cm)
35 DAT 45 DAT 75 DAT 90 DAT
4 55.8 b-e 73.17 a 98.83 b 100.50 cde
62.50 a 74.87 a 104.8 a 105.83 a
So K1 55.07 cde 67.90 cde 98.33 b 98.67 bcd
K1.5 59.30 abc 71.67 abc 102.3 ab 103.2 ab
K1 63.2 a 72.43 ab 98.83 b 102.2 cde
K4 . 53.8 del 68.30cde 83.23 del 89.97 de
Kas 5857 abcd 69.27 be 86.73 cd 100.6 ab
53 K1 55.97 bcde 68.43 cd 88.93 c 90.20 cde
K15 56.17 bcde 71.20 abc 88.50 cd 96.63 ab
K2 60.40 ab 68.33 cd 88.20 cd 99.40 ab
4 46.13 h 61.70 1gW 78.13 Ig 83.80 Ig
Ko.s 48.90 fgh 58.30 ij 83.90 cde 89.17 ef
S6 K1 51.80 efg 62.57 Igh 84.37 cde 88.10 ef
K1.5 53.83 del 62.50 Igh 80.03 efg 86.90 ef
K2 51.37 efg 64.45 efg 80.53 efg 95.80 bc
K0 44.70 h 51.27 k 59.43 h 76.53 h
K0.5 51.50 efg 65.10 del 80.97e1g 80.43 gh
S9 K1 48.23 gh 60.93 ghi 79.97 efg 84.10 Ig
K1.5 52.57 efg 56.73 j 76.0 g 86.83 ef
K2 51.83 efg 60.40 hij 76.20 g 86.40 ef
I.SD 40.05) 5.186 3.853 5.423 5.754
Significant level *
CV (%) 1 5.80 3.56 3.82 3.84
S0 =0 dSnr'. 5 3 CJSTW', Se=6 dSm"and S9 9 dSnr'
K0= no foliar application of K K 5 = 0.5mM K as foliar application. K1 = I mM K as foliar application, K1 s 1.5 mM K as foliar application, K2 = 2 mM K as loliar application and in all the treatments, 21311 oftotal
rtcommended dose of K (as MoP fertilizer) was applied in the soil.
-Signilicunt at 5% level
At 45 DAT, the highest plant height (74.87 cm) which was statistically similar with S0K0, S0K5, S0K2, S3K1 5 (73.17. 71.67, 72.43, 71.20 cm respectively) in 75 DAT the highest plant height( 104.8 cm) which was statistically similar with SoK15. is observed (102.3cm), and at 90 DAT the highest plant height 105.83 (S0Ko.5) cm it was statistically similar with SoKi.s. S3KO.s. S3K.5. S3K2 are observed (103.2, 100.6. 96.63. 99.40 cm respectively). At 35 DAT the lowest plant height is 44.70 cm which was statistically similar with S9Ko. S9K1. S6K0.5 is observed (44.70. 48.23 . 48.90 cm respectively), at 45 DAT the lowest plant height (51.27cm) statistically similar with ScK2. S6Ko.5
90 .50 80
70 63.13
'A 60
57.53 C) >50
S 40 36,87 ?897 is
p
1 ILL
35 OAT 45 DAT
53 56 59 V
57. 5355 .93
it
75 DAT- 16.921474; -t
n
90 OAT
are observed (60.40, 58.30 cm respectively). These results are in agreement with that of Qadar (1998) who found that the supplementation of K (30 kg K20 ha
S
) in sodic soil increased plant height, shoot dry weight and grain yield of rice, where these growth and yield components of rice adversely affected by increasing the sodicity. The increasing levels of K application improved plant height, tiller numbers, shoot dry weight of both salt tolerant and susceptible cultivars and this beneficial effect of K application under saline conditions may be attributed to its influence on net photosynthesis (Bohra and Doertlling, 1993).4.2 Number of leaves hill Effects of salinity
Number of leaves hill4 of I3RRI dhan29 decreased as the level of salinity increased due to the mean effect of different sort of K applications (Figure 3) at different days after transplanting (DAT). At 35, 45. 75. and 90 DAT the highest number of leaves hill4 (40.50. 69.27. 76.39 and 17.77 cm respectively) was recorded in So (0 dSm'). At 90 DAT, the highest number of leaves hilr' was observed from the So treatment which was statistically similar withS3(16.92).whereas the lowest number of leaves hill
S
' at 35 DAT, 45 DAT. 75 DAT and 90 (28.75. 52.24. 48.83 and 14.40 respectively) was obtained from 9 dSm'(Appendix VI). It was observed that where salinity level was high the number of leaves hill' was lower than the other salinity level.So=OdSm'. S;= 3 dSm'. 86=6dSnV' and Sg=9 dSnr'
Figure 3. Effects of salinity on number of leaves hilF' at different stages of BRR! dhan29
31
P
9
CD)z
M 0 NO OF LEAVES HILL-1- - .-
00 0 00a
0ar
36
o
f
UI c
3511 1111
35.88
;xnz I. so_ac
iit
.
0<
-
53.17a ;
Era
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5 CDS
a
I.r c1Q ;co
a o
cS33
r
0 rig 3o
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-
-lss.i2
56i4
58.54 n 0
o
2 0 C) d — It
— 0 3 0 —
0. CI)
a L7iE].
-t a 8 0 0
15.64 15.670 — •
-1
0
The highest number of leaves hill1 at 35 DAT, 45 DAT, 75 DAT and 90 DAT (37.08. 63.04. 68.64 and 17.20 respectively) was given by K2 (2 mMK foliar spray of KNO3 and 2/3 rd soil application of total MoP fertilizer). (Table 4.2) At 35 DAT, the highest number of leaves hilt1 was observed from the K2 treatment which was statistically similar with Ko, K,.5 (35.08,35.88 respectively). At 90 DAT. the highest number of leaves hilt' was observed from the K2 treatment which was statistically similar with Ko, K.s (17.02, 15.64 respectively). The lowest number of leaves hilt' at 35 DAT .90 DAT (30.2. 14.67) was observed in Treatment Ki (I mMK), at 35 DAT. 30.21 was statistically similar with K.5 (30.60) and the lowest number of leaves hilt' at 90 DAT was observed in treatment Sc was statistically similar with K0.Ks,K,.(l7.02,l5.64.l5.25 respectively ). The lowest number of leaves hilt' at 45 DAT,75 DAT (53.08, 45.70 respectively) was observed in Treatment Ko (0 mMK).
Combination effect of salinity and potassium
The effect of different application methods of K on number of leaves hilt' of BRRI dhan29 at different salinity levels was found significant. (Table -4) At 35,45 and 90 DAT the highest number of leaves hilt' (53.67, 81.50. 21.00 respectively) was recorded SoKo(0 dSm' treated with 0 mMK foliar spray and 2/3w soil application of total MoP fertilizer) and 75 DAT the highest number of leaves hilt' is 90.33 .At 90 DAT the highest plant height (21.00cm) was observed from the SoKo treatment which was statistically similar with the treatment S0K0s.S0K,.S0K,.s.SoK2,SK,, S3K, 5.
S3K2 were observred from (17.0. 18.00, 16.33, 16.33, 17.4, 16.17, 17.50, 16.33 respectively). At 35 DAT, 45 DAT, 90 DAT was the lowest (17.23. 33.33. 11.4 respectively) in S6K.5 treatment (6 dSm' treated with foliar application of 0.5 mMK). At 75 DAT the lowest number of leaves hilt' (35.67) was recorded in S3KS (3 dSm' treated with2/31 soil application of total MoP fertilizer).
At 35 DAT the lowest number of leaves hilt' was observed from the S6K0,5 treatment which was statistically similar with S9KIS(2 1.33). At 90 DAT, the lowest number of leaves hilt' was observed from the S6Kostreatment which was statistically similar withS6K, S61(,5, S9K, (12.33, 14.50,12.17 respectively). Dolatabadian ci at (2011) observed that the increase of salinity level significantly decreased shoot and root weight, total biomass, plant height and leaf number while studying with Glvcine mar.
Table 4.2 Combined effect of different fertilization methods of potassium and salinity level on plant height at different stages of BRRI dhan29
Treatment Number of Leaves hill'
35 DAT 45 DAT 75 DAT 90 DAT
Xc 53.67 a 81.50 a 83.00 bc 21.00 a
Kos 40.00 cde 61.6 d 59.80 e 17.17 a-e
so K, 31.00 ghi 74.17 b 84.83 b 18.00 abc
K1.5 47.83 b 65.00cd 74.83 d 16.33 a-f
K, 30.00 hi 64.00 cd 79.50 c 16.33 a-f
Ko 34.1 1gb 61.0 de 42.67 hi 15.60 b-g
Kas 27.17 ij 65.67 cd 35.67 k 19.00 abc
K, 35.1 efg 55.33 Ig 54.93 I 16.17 a-g
43.33 bcd 68.80 c 53.33 I 17.5 abed
K,
44.50 bc 64.83cd 61.07 e 16.33 a-fKo 30.33 ghi 56.3 efg 45.33 gh 15.33 b-g
Ku.s 17.23 I 33.33 k 39.00 jk 11.40 g
K, 30.00 hi 43.33 j 52.47 I 12.33 efg
KLs 31.00 ghi 43.00 j 52.50 1 14.50 c-g
1(2 35.1 efg 56.67 ef 90.33 a 20.13 ab
Ko 22.17 jkl 49.83 h 74.33 d 16.17 a-g
<as 38.00 of 51.67 gh 48.33 g 15.00 c-g
K, 24.67 Jk 48.6 hi 36.33 k 12.17 Ig
21.33 Id 44.3 ii 41.50 ij 12.67 defg
K, 38.67 del 66.67 c 43.67 hI 16.00 b-g
LW coal 5.050 4.936 3.607 4.862
Significant level *
CV (%) 9.05 5.17 3.78 8.43
() dSrw'. S3 = 3 dSnv', S6z.6 dSnr'and S) 9 dSm4
Ko no foliar application ofK .K 0.5mM K as foliar application, Ku = 1 mM K as foliar application, K1 13 mM K as foliar application. K2 = 2 mM K as foliar application and in all the treatments, 2/3d of total
recommcndcd dose of K (as MoP fertilizer) was applied in the soil.
*Significant at 5% level
4.3 Number of tillers bill' Effects of salinity
20 1814 18.42 18.47
18 17.1 17.08 17.37
15.31 26.03
16 14.21388 14 13.93
14 11.61
12 10.4 O.33 a 10
I
In
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