A short review of the impact and management of weedy rice

S. M. Rezaul Karim, Ismail Sahid, M. Azmi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Weedy rice consists of the early shattering biotypes of cultivated rice (Oryza sativa L.) and the natural hybrids of Oryza spp. and the cultivated rice varieties. Some important characteristics of weedy rice include comparatively early maturation, easy shattering, short shattering periods, red pericarp (in some strains), short grain, long awns and tall plant habit. Continuous direct seeding over the seasons and poor water management are the main factors enhancing infestation with weedy rice biotypes. Under moderate infestation (15-20 panicles m-2) there occurs about 50-60% yield loss and with high infestations (20-30 panicles m-2) up to 70-80% yield loss. Weedy rice seeds are an important contaminant of rice seeds, as they diminish farmers' income qualitatively and quantitatively. On an average there is 17-28% indirect cost through land preparation and 3-5% direct cost through manual weeding or roguing, incurred for controlling the weed. The farmers may get a return of US$105-374 ha-1 if the weed is controlled properly. An integrated approach including the use of clean certified seeds, sequential tillage for land preparation, burning of rice straw on the field, spraying of herbicides as a pre-planting procedure, manual weeding at the mid stage of rice growth and the use of transgenic herbicide-resistant rice cultivars, are suggested options to control weedy rice populations. The practice of water seeding and transplanting of rice seedlings instead of dry seeding and the rotation of rice crop with other upland crops like soybean and maize are recommended practices to effectively manage the weedy rice problem.

Original languageEnglish
Pages (from-to)13-19
Number of pages7
JournalPlant Protection Quarterly
Volume21
Issue number1
Publication statusPublished - 2006

Fingerprint

rice
seeding
biotype
site preparation
biotypes
seed
weed control
weed
herbicide
inflorescences
sowing
herbicides
weeds
seeds
culling (plants)
farmers
direct seeding
Oryza
crop
rice straw

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Horticulture
  • Management, Monitoring, Policy and Law
  • Nature and Landscape Conservation

Cite this

Rezaul Karim, S. M., Sahid, I., & Azmi, M. (2006). A short review of the impact and management of weedy rice. Plant Protection Quarterly, 21(1), 13-19.

A short review of the impact and management of weedy rice. / Rezaul Karim, S. M.; Sahid, Ismail; Azmi, M.

In: Plant Protection Quarterly, Vol. 21, No. 1, 2006, p. 13-19.

Research output: Contribution to journalArticle

Rezaul Karim, SM, Sahid, I & Azmi, M 2006, 'A short review of the impact and management of weedy rice', Plant Protection Quarterly, vol. 21, no. 1, pp. 13-19.
Rezaul Karim, S. M. ; Sahid, Ismail ; Azmi, M. / A short review of the impact and management of weedy rice. In: Plant Protection Quarterly. 2006 ; Vol. 21, No. 1. pp. 13-19.
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