1921
Volume s1-21, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645
USD

Abstract

Summary and Conclusions

In large-scale experiments with intermittent irrigation of rice fields, extending over four years, it has been found that the rice does not suffer in quantity or quality, under this practice. On the contrary there is usually some increase in yield, and the physical qualities are slightly improved. However, the effect on some varieties and in some soils may be somewhat variable.

In addition, it has been found that the amount of water used with intermittent irrigation is less than with continuous flooding.

Under ordinary field conditions, there was a reduction of over 80 per cent in the number of anopheline larvae found, while with good conditions breeding of anopheles was entirely controlled.

Intermittent irrigation requires special preparation of the fields and of the irrigation and drainage systems, and needs close supervision, which makes it somewhat more expensive than the ordinary method. However, once the fields are set up for this practice, the economic advantages resulting from an increased yield, and better conditions for labor, stimulate interest on the part of the growers, and the practice is spreading slowly.

It is concluded that intermittent irrigation is the only feasible method so far evolved for the control of anopheles breeding in the rice fields of Portugal.

Loading

Article metrics loading...

/content/journals/10.4269/ajtmh.1941.s1-21.123
1941-01-01
2017-09-20
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/journals/10.4269/ajtmh.1941.s1-21.123
Loading

Most Cited This Month

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error