Journal of Food, Agriculture and Environment

Planting geometry and spacing influence weed competitiveness of aerobic rice

Author(s):

 Norhidayati Bt. Sunyob ¹, Abdul Shukor Juraimi ¹*, Md. Moshiur Rahman ², Md. Parvez Anwar ^{2, 3}*, Azmi Man ⁴, Ahmad Selamat ¹

Recieved Date: 2012-01-16, Accepted Date: 2012-04-30

Abstract:

Aerobic rice, a potential water-wise rice production system, is subject to severe weed infestation and, therefore, development of a sustainable weed management strategy is crucial for its wide spread adoption. The present study was conducted for the two consecutive seasons at Pinang, Malaysia with aerobic rice variety AERON 1 using different planting geometries and densities under both weedy and weed-free conditions. The plant spacing tried in 2009-10 season were: 10 x 10 cm, 15 x 15 cm, 20 x 20 cm, 25 x 25 cm and 30 x 30 cm while those in 2010-11 season were: 15 x 15 cm, 15 x 20 cm, 20 x 20 cm, 20 x 25 cm and 25 x 25 cm. The experiment was laid out in split plot design with four replications assigning weeding regime in main plots and plant spacing in sub-plots. Aerobic rice field was infested with 12 and 22 weed species respectively in 2009-10 and 2010-11 seasons having Echinochloa colona, Leptochloa chinensis, Digitaria aescendens, Cyperus iria and Eleusine indica as the predominant weeds. Rice spacing exerted significant influence on both weed pressure and yield performance of AERON 1, but planting geometry did not. With the decrease in plant spacing weed dry matter decreased but rice yield increased. In both seasons, closest spacing resulted in maximum weed suppression which ultimately produced the highest rice yield. Weed inflicted relative yield loss was also minimized by the closest spacing. Present findings imply rice spacing mostly determines rice-weed competition, and can play a decisive role to minimize weed pressure. Therefore, closer spacing could be considered as a vital tool in the integrated weed management program for aerobic rice.

Keywords:

Square planting, rectangular planting, seeding density, weed competitiveness, dry seeded rice

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Agriculture
Pages: 330-336

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