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Vergara - 1976 - Physiological and morphological adaptability of ri

Vergara - 1976 - Physiological and morphological adaptability of ri

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RESPONSE TO DEEP WATER STRESS 303<br />

Table 1.<br />

Deep water areas planted to <strong>ri</strong>ce.<br />

Country Area in hectares Citation<br />

Bangladesh 2.000.000 G<strong>ri</strong>st 1965<br />

Alim e1 al 1962<br />

Chowdhury 8- Zaman 1970<br />

3.000.000 Jackson et al. 1972<br />

gum-m Perez. personal observation<br />

Shen State ?<br />

Eastern Rangoon 14,130<br />

Eastern Pegu 52.550<br />

Irrawaddy 81.000<br />

Cambodia<br />

Perez. personal observation<br />

Phnom Penh<br />

Elattambang i 59-090<br />

French Guinea — Porteres 1955<br />

Gambia 8.000 FAO-WARDA 1972<br />

India<br />

Madras 12.150 S<strong>ri</strong>nivasan 1966<br />

Andhra Pradesh <strong>and</strong><br />

Tamil Nadu 260.000 Seetharaman 1970<br />

Manipur Sin h 1962 v<br />

Asuam — RIC hana 8. MlSlO 1960<br />

Karma — Richhana 8. Misro 1980<br />

Tamil Nadu — Anonymous 1963<br />

Indonesia - Jackson et al. 1972<br />

Mali 131,500 FAO-WARDA 1972<br />

Niger 2.500 USDA & USAID 1968<br />

5.000 FAO-WARDA 1972<br />

Nige<strong>ri</strong>a 2.997 Nige<strong>ri</strong>a 1964<br />

30.000 FAO-WARDA 1972<br />

85.000 Patil 1973<br />

phmppines 120 Octubre 8 Mendoza 1949<br />

Batae. llccos Norle - Octubre 1951<br />

Sierra Leone 6.000 FAO-WARDA 1972<br />

14,350 Wart Af<strong>ri</strong>can Rice Research Institute<br />

1956<br />

South Vietnam 500.000 Jackson, personal observation<br />

South Vietnam 8. Cambodia 360.000 Nagal 1959<br />

Sudan — Camus 8 Viguler 1937<br />

Thail<strong>and</strong> 1.000.000 Jacknon et al. 1972<br />

Yantasast. Prechachat 8t Jackson 1970<br />

Mo<strong>ri</strong>shima 1964<br />

Rate <strong>of</strong> increase in water level<br />

Rice plants have been reported to increase in platn height by as much as 20 to<br />

25 cm a day (Chowdhurry <strong>and</strong> Zuman. 1970). A daily increase <strong>of</strong> more than 25<br />

cm in water level will drastically" reduce the chance <strong>of</strong> <strong>ri</strong>ce plant survival. In<br />

Bangladesh. the increase is 60 to 90 cm/day du<strong>ri</strong>ng the beginning <strong>of</strong> the monsoon<br />

(Alim ct al.. 1962; Chowdhuny <strong>and</strong> Zaman. 1970). The problem <strong>of</strong> rate <strong>of</strong><br />

increase in water is much more se<strong>ri</strong>ous in Bangladesh. The <strong>ri</strong>ce plant must<br />

have a grater or faster capacity to elongate with increase in water level.<br />

In Thail<strong>and</strong>. the rate <strong>of</strong> increase in water <strong>ri</strong>se is 3 to 8 cm per day (Mo<strong>ri</strong>shima.<br />

1964'. Yantasast et al., 1970). Figure 1 shows the duration, depth, <strong>and</strong> daily

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