Comparative study of vegetative and reproductive growth of local weedy and 'clear field' rice varieties in Malaysia
2014
Nur Hidayatul Shuhada Anuar | Norida Mazlan | Engku Ahmad Khairi Engku Ariff | Abdul Shukor Juraimi | Mohd Rafii Yusop
The movement from transplanting to direct seeding has brought weedy rice problems in Malaysia's rice granary areas. Weedy rice (Oryza spp.) is very difficult to control compared to other weeds due its close genetic relationship to the cultivated rice (Oryza sativa L.) therefore it cannot be controlled with conventional rice herbicides. Recently, a new technology for controlling weedy rice in rice fields which is known as 'clear field' Production System has been introduced by discovering the combination of herbicide imidazolinone and resistant trait containing variety. Two cultivars have been released by Malaysia known as MR 220 CL 1 and MR 220 CL 2 which were derived from crosses between CL 1770 from Louisiana State University [USA] with a Malaysian local rice variety, MR 220. The objective of the study is to understand the growth patterns (vegetative and reproductive) of four different weedy rice morphotypes and two variants of 'clear field' rice in Malaysia. Weedy morphotypes were observed being significantly taller in all growth stages compared to 'clear field'. Tillering of weedy morphotypes were not different from 'clear field' variants except for WR4 at 60 days after seeding (DAS). Flowering and maturity periods observed in weedy morphotypes were ranged widely where all weedy morphotypes flowered 10 to 20 days later than the 'clear field' rice varieties. Understanding all these morphological and physiological characteristics of weedy rice is useful to improve the weedy rice management and good agricultural practices for better control of escaped weedy rice in the 'clear field' planting areas.
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