Conclusions

Every year the agricultural area (especially of rice, the main food crop of Vietnam) that is lost due to droughts exceeds 10,000 ha. The time of commencement and termination of drought is different for different regions in the country. Drought intensity is higher in southern Vietnam. While summer droughts usually occur in the central regions, winter-spring droughts occur in northern and southern Vietnam. Drought indices to

Table 27.5 Percentage of months with different intensity of drought (measured by drought index, K) for various regions in Vietnam

Agricultural regions

K < 1

K > 1

K>2

K> 5

North mountain and midland

62.1

37.9

20.5

1.58

Red River delta

61.7

38.3

32.6

1.9

North-central

65.8

34.2

10.7

0.59

South-central

55.6

44.4

23.6

20.8

Southeast

63.3

36.7

30.2

16.0

Mekong River delta

65.7

34.3

30.3

18.0

Entire nation

62.0

38.0

21.1

5.6

monitor drought conditions are mainly based on weather data. There is a need to develop indices using satellite data to improve the drought-monitoring system in Vietnam.

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