Tamarind monograph.pdf - Crops for the Future
Tamarind monograph.pdf - Crops for the Future
Tamarind monograph.pdf - Crops for the Future
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An experiment was conducted to evaluate <strong>the</strong> effectiveness of foliar sprays<br />
of cycocel (1500 ppm), Ethrel (500 ppm), Triacontanol (20 ml tree -1 ), IBA<br />
(150 ppm), Planofix (100 ppm), micronutrient mixture (0.5%), ZnSO4<br />
(0.5%) + boric acid (0.3%) + FeSO4 (0.5%) and urea (1.5%) on flowering<br />
pod set and fruit retention at Tamil Nadu Agricultural University,<br />
Coimbatore. All <strong>the</strong> treatments with growth regulators and chemicals<br />
exhibited significant effects on flowering, pod set and retention. Treatment<br />
with foliar feeding urea resulted in maximum numbers of flowering (75.7%)<br />
and cycocel resulted in maximum pod set (32.3%) and retention (54.7%) per<br />
unit area (Ilango and Vidyalakshri, 2002).<br />
Table 6.2 Clonal variation of sterility, dimorphism and viability of<br />
tamarind pollen<br />
Characteristic Clones<br />
NBN1 NBN2 NBN3 RDB<br />
Pollen sterility<br />
(%)<br />
Pollen<br />
dimorphism<br />
(%)<br />
Pollen<br />
viability in<br />
ambient<br />
storage (%)<br />
Pollen<br />
viability in<br />
cold storage<br />
(%)<br />
1.18<br />
(1.08)<br />
11.03<br />
(3.32)<br />
88.00<br />
(9.38)<br />
97.40<br />
(9.87)<br />
1.13<br />
(1.06)<br />
13.39<br />
(3.65)<br />
88.20<br />
(9.39)<br />
96.80<br />
(9.84)<br />
0.79<br />
(0.88)<br />
12.08<br />
(3.47)<br />
84.80<br />
(9.20)<br />
97.00<br />
(9.85)<br />
91<br />
Patna<br />
1.80<br />
(1.33)<br />
9.63<br />
(3.10)<br />
85.60<br />
(9.25)<br />
96.60<br />
(9.83)<br />
JRK<br />
1.93<br />
(1.38)<br />
10.23<br />
(3.19)<br />
86.60<br />
(9.30)<br />
97.00<br />
(9.85)<br />
SEM LSD CV<br />
(%)<br />
0.04<br />
0.04<br />
0.15<br />
0.03<br />
0.08<br />
0.08<br />
Source: Nagarajan et al., 1997.<br />
Note: NBN, RDB Patna and JRK are tamarind clones identified from<br />
Gottipura, Karnataka State, India. NS=Not significant. SEM=Standard<br />
error of means. The values in paren<strong>the</strong>sis are trans<strong>for</strong>med means (square<br />
root trans<strong>for</strong>mation).<br />
6.5 Fruit set, breeding and mating system<br />
In spite of profuse flowering, fruit set in tamarind is very low under open<br />
pollination. Studies carried out in Sri Lanka revealed that about 10-15% of<br />
flowers developed as fruits although Nagarajan et al. (1997) observed only<br />
1-2% of flowers developed as fruits. This may be due to <strong>the</strong> short-lived<br />
nature of <strong>the</strong> flowers (about 48 hours) and also due to pollinator limitation,<br />
thus many flowers appear not to be pollinated during <strong>the</strong>ir short stigmatic<br />
NS<br />
NS<br />
5.26<br />
1.86<br />
2.46<br />
0.52
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