A, The ALLELOPATHIC EFFECT OF AQUEOUS EXTRACT OF CARTHAMUS TINCTORIUS ON GERMINATION AND INITIAL SEEDLING GROWTH OF ORYZA PUNCTATA

Abstract

Chemical weed control method creates environmental hazards and residual effects in crops and soil. Alternate approach to control weeds is getting attentions in sustainable production system. Aqueous extract of crop is an important technique to control weed and also environment friendly and cheap. To investigate the herbicidal potential of aqueous extract of winter crop Carthamus tinctorius (safflower) on summer weed Oryza punctata (red rice) seed germination and initial seedling growth, a study was planned in Weed Science Laboratory. In this study, seeds of C. tinctorius were incubated in seven concentrations (0, 0.25, 0.50, 1, 2, 4, and 8%) of different parts i.e. leaves, stem, flower of C. tinctorius. All the tested concentrations of various plant parts of C. tinctorius significantly inhibited the mean emergence time, germination index, germination percentage (%), time taken to 50% germination as well as growth of O. punctata weed. However, maximum mean emergence time (4.73 days), time taken to 50% germination (4.19 days) was noted at 8% concentration and germination index of O. punctata was noted at 0.25% concentration when flower extract was applied. Leaf aqueous extract at the concentration 8% caused the lowest root length (1.53 cm), shoot length (4.51 cm) and fresh weight (54.72 g) of O. punctata. Results suggested leaf and flower extract of C. tinctorius at concentration (8%) can be used potential bio-herbicide for the control of red rice. Key words: Allelopathy, seedling growth, inhibitory, weed growth, plant parts, promotor

Comparative advantages of aqueous extract of mustard crop residues with herbicide to weed control and crop performance of wheat

“…Weed management in wheat production necessitates consistent efforts to control weeds. Research has shown that aqueous extracts from various allelopathic plants are effective in managing weeds not only in wheat but also in another crops (Khan et al, 2015;Khan et al, 2013). These plants produce allelochemicals that can significantly curb weed growth in organic farming systems without disrupting the environment, thereby enhancing crop yields (Soltys et al, 2013).…”

Evaluation of pre-emergence herbicides for weed control in maize

“…Grain crops such as maize, sorghum, wheat and barley are in high demand to alleviate dire food insecurity worldwide (Owen, Martinez, & Powles, 2015). Production of these crops, however, is limited by weeds (Khan, Hussain & Khan, 2008), found to be one of the significant constraints to efficient crop production (Mhlanga et al, 2015).…”