Weedy rice: An expanding problem in direct‐seeded rice in the Philippines

2020 ◽  
Vol 20 (2) ◽  
pp. 27-37
Author(s):  
Leylani M. Juliano ◽  
Dindo King M. Donayre ◽  
Edwin C. Martin ◽  
Jesusa C. Beltran
Keyword(s):  
The Philippines ◽  
Weedy Rice ◽  
Direct Seeded

scholarly journals Cross-Resistance to Imazapic and Imazapyr in a Weedy Rice (Oryza sativa) Biotype Found in Malaysia

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
M. DILIPKUMAR ◽  
N.R. BURGOS ◽  
T.S. CHUAH ◽  
S. ISMAIL
Keyword(s):  
Rice Field ◽  
Rice Cultivar ◽  
Management Tool ◽  
Cross Resistance ◽  
Weedy Rice ◽  
Effective Management ◽  
Herbicide Resistant ◽  
First Case ◽  
Direct Seeded ◽  
Selection Of

ABSTRACT: The Clearfield® rice production system is an effective management tool for weedy rice and other weeds in the direct-seeded rice culture. However, if farmers cultivating the Clearfield® rice disregard stewardship recommendations, the industry could face a problem of herbicide-resistant weedy rice which would occur through the selection of outcrosses. This study aimed to confirm imidazolinone-resistant weedy rice in Malaysia. The resistant weedy rice (R-WR) was found to be 67 fold more resistant to OnDuty® (premix of imazapic and imazapyr) than the susceptible weedy rice (S-WR) based on the GR50 values (rate that causes 50% inhibition of shoot growth). The Clearfield® rice cultivar was 32-fold more tolerant to OnDuty® than the S-WR. Furthermore, the R-WR was 54 and 89 fold more resistant to imazapic and imazapyr applied separately than the S-WR, respectively. The Clearfield® rice was 140- and 40-fold more tolerant to imazapic and imazapyr, respectively than the S-WR. The R-WR biotype was susceptible to non-selective herbicides glyphosate and glufosinate, as well as the selective graminicide quizalofop. Oxadiazon controlled the R-WR biotype, but pretilachlor was ineffective. The present study documented the first case of weedy rice that was cross-resistant to imazapic and imazapyr in Malaysian Clearfield® rice field.

Chemical control of weedy rice in precise hill-direct-seeded rice in South China

2013 ◽  
Vol 13 (1) ◽  
pp. 39-43 ◽  
Author(s):  
Xuefeng Shen ◽  
Xuhua Gao ◽  
A. Egrinya Eneji ◽  
Yong Chen
Keyword(s):  
South China ◽  
Chemical Control ◽  
Weedy Rice ◽  
Direct Seeded

Impact of weedy rice populations on the growth and yield of direct-seeded and transplanted rice

2007 ◽  
Vol 7 (2) ◽  
pp. 97-104 ◽  
Author(s):  
QIAN JIN CAO ◽  
BO LI ◽  
ZHI PING SONG ◽  
XING XING CAI ◽  
BAO-RONG LU
Keyword(s):  
Growth And Yield ◽  
Weedy Rice ◽  
Transplanted Rice ◽  
Direct Seeded

scholarly journals Interactive Effect of Weeding Regimes, Rice Cultivars, and Seeding Rates Influence the Rice-Weed Competition under Dry Direct-Seeded Condition

2020 ◽  
Vol 13 (1) ◽  
pp. 317
Author(s):  
Sharif Ahmed ◽  
M. Jahangir Alam ◽  
Akbar Hossain ◽  
A. K. M. Mominul Islam ◽  
Tahir H. Awan ◽  
...  
Keyword(s):  
Weed Management ◽  
Oryza Sativa L ◽  
Interactive Effect ◽  
Rice Production ◽  
Weedy Rice ◽  
Rice Grain ◽  
Rice Cultivars ◽  
Seeding Rate ◽  
Direct Seeded ◽  
Hybrid Cultivar

Dry direct-seeded rice (Oryza sativa L.), a climate-smart and resource-efficient (labor and water) rice production technology is gaining popularity in many parts of Asian countries; however, weeds are the major constraints for its early establishment and optimum productivity. Chemical weed management is effective, rapid, and also decreases weed management costs in dry direct-seeded rice (DSR) system; however, chemical use for weed management have a negative effect on the environment and also have human health hazards. Therefore, integrated weed management (IWM) is the best option for the sustainability of rice production under the DSR system. Improving competitiveness against weeds, weed-competitive rice cultivars, and high seeding rates were found to be the most promising IWM strategies in DSR. In this context, a field study was conducted to evaluate the weed competitiveness of rice cultivars and seeding rates on the performance of aus rice in dry direct-seeded systems in Bangladesh. Three inbred rice cultivars (CV), namely “BRRI dhan26”, “BRRI dhan48”, and “BRRI dhan55”, and one hybrid cultivar, “Arize” were tested in a seeding rate (SR) of 20, 40, and 80 kg ha−1 under two weeding regimes (WR) of weed-free and partially-weedy. Rice grain yield was strongly affected (p < 0.01) by the interactions of WR, CV, and SR. In weed-free conditions, the yield of all three inbred cultivars was increased up to SR of 40 kg ha−1 and for the hybrid cultivar, up to SR of 20 kg ha−1, and with further increment of SR, there was no yield advantage. Conversely, under partially weedy conditions, the yield of three inbred cultivars increased up to SR of 80 kg ha−1; however, for the hybrid cultivar, this increment was up to SR of 40 kg ha−1 and thereafter, no yield gain. In weedy conditions, the higher SR compensates for the yield losses by increasing the competitiveness of rice with weeds. Across SR, the hybrid cultivar had a significantly (p < 0.01) higher weed competitive index (WCI) than all the inbred cultivars and the highest SR always had a higher WCI.

scholarly journals SEPARABILITY OF TRANSPLANTED AND DIRECT SEEDED RICE USING MULTI-TEMPORAL SENTINEL-1A DATA

2019 ◽  
Vol XLII-4/W19 ◽  
pp. 471-478
Author(s):  
L. Villano ◽  
J. Raviz ◽  
N. M. Paguirigan ◽  
M. A. Gutierrez ◽  
M. R. Mabalay ◽  
...  
Keyword(s):  
Management Practices ◽  
Field Measurements ◽  
The Philippines ◽  
Fine Tuning ◽  
Growth Stages ◽  
Land Preparation ◽  
Crop Establishment ◽  
Establishment Method ◽  
Multi Temporal ◽  
Direct Seeded

Abstract. Occurrence of pests and diseases are influenced by several factors including weather, landscape and field-level factors such as crop management practices including crop establishment method. In this paper, we adopted and applied a method using Sentinel-1A (S-1A) Synthetic Aperture Radar (SAR) intensity to discriminate between rice fields that are transplanted and direct seeded to come up with a robust method for automated classification of crop establishment method. Multi-temporal S-1A C-band dual polarization images at 20m resolution covering the wet cropping season over four provinces in the Philippines were acquired from March to November 2018. Field measurements, observations and interviews were conducted on 186 sample fields and mean backscatter values for each of the sampled fields were generated from S-1A data acquired during the season. The reported dates of land preparation and estimated dates of crop growth stages were matched with the corresponding SAR acquisition dates. We used the Mann-Whitney U test to identify growth stages for which there are significant differences in backscatter values between transplanted and direct seeded rice. The results are generally consistent with the findings of a previous study conducted in one province in the Philippines in the dry season of 2017. We found, however, some inconsistencies in terms of the polarization where the significant differences were observed. These findings demonstrate the possibility of discriminating transplanted from direct seeded rice using SAR temporal data but suggests further fine tuning in the methodology is needed for different locations and seasons.

Technology Development and the Spread of Direct-Seeded Flooded Rice in Southeast Asia

1986 ◽  
Vol 22 (4) ◽  
pp. 417-426 ◽  
Author(s):  
S. K. De Datta
Keyword(s):  
Southeast Asia ◽  
Weed Management ◽  
Technology Development ◽  
The Philippines ◽  
Advantages And Disadvantages ◽  
Flooded Rice ◽  
National Programmes ◽  
Early Maturing ◽  
Direct Seeded ◽  
Management Techniques

SUMMARYIncreased labour costs and area under irrigation, the development of modern early-maturing varieties and improved fertilizer and weed management techniques have encouraged many farmers in the Philippines, Malaysia and Thailand to switch from transplanted to direct-seeded flooded rice culture. This paper summarizes the development and spread of the technology for direct-seeded flooded rice in southeast Asia and the contribution made by research at IRRI and by national programmes. It covers research on crop establishment, varietal requirements, fertilizer management, weed control and economics and examines the advantages and disadvantages of direct-seeding compared with transplanting.

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