Start Submission Become a Reviewer

Reading: Weed Management by Rice Straw Mulching in Direct Seeded Lowland Rice (Oryza sativa L.)

Download

A- A+
dyslexia friendly

Research Articles

Weed Management by Rice Straw Mulching in Direct Seeded Lowland Rice (Oryza sativa L.)

Authors:

DAUD Devasinghe,

Department of Plant Sciences, Faculty of Agriculture, Rajarata University of Sri Lanka, Puliyankulama, Anuradhapura, LK
X close

KP Premarathne ,

Department of Crop Science, Faculty of Agriculture, University of Peradeniya, Peradeniya, LK
X close

UR Sangakkara

Department of Crop Science, Faculty of Agriculture, University of Peradeniya, Peradeniya, LK
X close

Abstract

Direct seeding of rice (Oryza sativa L.) induces the production of greater grain yields in water deficit areas. However, weeds pose a serious threat to sustainability of yield of direct-seeded rice. This field study evaluated the effectiveness of rice straw mulch on managing weed populations and increasing yields of direct wet-seeded (DWSR) and direct dry-seeded rice (DDSR) in 2009 Yala (DS) and 2009/2010 Maha (WS) seasons in a principal rice growing region of Sri Lanka. The major weeds associated with DDSR in DS were Cyperus rotundus, Isachne globosa and Leptochloa chinensis. In DWSR, the dominant species were Cyperus rotundus, Echinochloa crus-galli and Isachne globosa. The weed density was reduced in the WS and the major weeds were Cyperus rotundus, Echinochloa crus-galli and Isachne globosa. In both systems Cyperus rotundus was the most dominant weed species in all treatments based on the summed dominance ratio. The rice straw mulch was effective in weed management under DWSR, but not in DDSR. The grain yield was inversely correlated with increasing weed biomass and weed density in both systems. Compared to DWSR, chemical weeding which is the present practice in Sri Lanka, yield gains of 9.23% and 5.74% were achieved in DWSR with a straw mulch and a yield loss of 49.88% and 22.24% in the DDSR with the same treatment in DS and WS, respectively. The study indicated the possibility of suppressing weeds in direct wet-seeded land low rice with straw mulch in both seasons.

Key words: Direct dry-seeding; direct wet-seeding; grain yield; rice straw mulch; weed management

DOI: http://dx.doi.org/10.4038/tar.v22i3.3699

Tropical Agricultural Research 22(3) (2011) 263-272

How to Cite: Devasinghe, D., Premarathne, K. & Sangakkara, U., (2011). Weed Management by Rice Straw Mulching in Direct Seeded Lowland Rice (Oryza sativa L.). Tropical Agricultural Research. 22(3), pp.263–272. DOI: http://doi.org/10.4038/tar.v22i3.3699
Published on 17 Oct 2011.
Peer Reviewed

Downloads

  • PDF (EN)

    comments powered by Disqus