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Registros recuperados: 6
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Germination ecology of Rhynchosia capitata: an emerging summer weed in Asia Planta Daninha
Ali,H.H.; Tanveer,A.; Nadeem,M.A.; Asghar,H.N.; Javaid,M.M..
Rhynchosia capitata is becoming an increasing problem in summer crops, such as cotton, soybean, pearl millet and mungbean in many Asian countries. Laboratory and greenhouse studies have been conducted to determine the effects of several environmental factors on seed germination patterns and seedling emergence of R. capitata. We investigated whether the diverse ecological factors such as temperature, light, salinity, moisture stress, pH, and soil depth affected germination and seedling emergence of R. capitata. Germination increased as temperature increased from 25ºC and significantly reduced at 45ºC. Presence or absence of light did not influence germination. Germination of R. capitata was sensitive to increased salt and moisture stress, as well as to seed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Moisture stress; PH; Salinity; Seedling emergence; Burial depth.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000200002
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Allelopathic effects of Rhynchosia capitata on germination and seedling growth of mungbean Planta Daninha
Ali,H.H.; Tanveer,A.; Nadeem,M.A.; Javaid,M.M.; Kashif,M.S.; Chadhar,A.R..
Experiments were conducted to evaluate the allelopathic influence of Rhynchosia capitata on germination and seedling growth of mungbean (Vigna radiate) along with identification of the phytotoxic substances responsible for this activity. Water extracts of root, shoot, leaf, fruit and whole plant were prepared by soaking them in water in a ratio of 1:20 (w/v) for 24 h. All the extracts affected germination and seedling growth of mungbean, but higher inhibition was seen with R. capitata leaf water extracts. A linear decrease in the germination characteristics of mungbean was observed with the decrease in the concentration of leaf extract from 5% to 1%. The soil-incorporated residues (1-4% w/w) of R. capitata stimulated the growth of root and hypocotyl at low...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phytotoxic; Phenolic; Allelopathy; Residues; Concentration; Water extracts.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000300002
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Optimizing activity of herbicides at reduced rate on Emex spinosa campd. with adjuvants Planta Daninha
Javaid,M.M.; Tanveer,A.; Ahmad,R.; Yaseen,M.; Khaliq,A.
In pot experiments, two adjuvants were evaluated for their efficacy in enhancing activity of five herbicides applied at reduced rates (75% of the recommended rates) on Emex spinosa at the cotyledon-leaf and at the two- to four- leaf stage. Herbicides (at recommended rates) including fluroxypyr+MCPA at 450 g a.i. ha-1, carfentrazone-ethyl at 20 g a.i. ha-1, bromoxynil+MCPA at 450 g a.i. ha-1, thifensulfuron-methyl at 75 g a.i. ha-1 and tribenuronmethyl at 75 g a.i. ha-1 alone and tank mixed at reduced rates with adjuvants, namely, alkyl ether sulphate sodium salt at 625 mL ha-1 or fatty alcohol ethoxylate at 375 mL ha-1. Addition of the adjuvants to reduced rates of fluroxypyr+MCPA and carfentrazone-ethyl, increased their efficacy with 100% mortality and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alkyl ether sulphate sodium salt; Devil's thorn; Fatty alcohol ethoxylate; Herbicides; Weed leaf stages.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000200023
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Implications of weeds of genus euphorbia for crop production: a review Planta Daninha
Tanveer,A.; Khaliq,A.; Javaid,M.M.; Chaudhry,M.N.; Awan,I..
The genus Euphorbia comprises about 2000 species ranging from annuals to trees, including C3, C4, and CAM species. Euphorbia species widely studied in agriculture includes E. antiquorum, E. carollata, E. dentata, E. dracunculoides, E. esula, E. geniculata, E. granulata, E. helioscopia, E. heterophylla, E. hierosolymitana, E. hirta, E. maculata, E. microphylla, E. nerifolia, E. piluifera, E. pulcherrima, E. royleana, E. supine, and E. thiamifolia. These species have been reported mainly in field crops/vegetables, orchards, pastures, and rangelands. Euphorbia plants may present allelopathic effect over desirable cereals, pulses, oilseeds, vegetables, forage plants, and nitrifying bacteria, posing a serious threat to livestock production on open range lands...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Competition; Allelopathy; Crops; Pastures; Livestock; Plant protection.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000300024
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Effect of ecological factors on germination of horse purslane (Trianthema portulacastrum) Planta Daninha
Tanveer,A.; Mumtaz,K.; Javaid,M.M.; Chaudhry,M.N.; Balal,R.M.; Khaliq,A..
Trianthema portulacastrum is a very problematic summer crop weed and a complete crop failure has been observed because of this weed at high density. The effect of different ecological factors on germination of T. portulacastrum seeds collected in two different years (2009 and 2005) was studied in laboratory experiments. An increase in temperature from 25 to 35 ºC increased germination percentage of T. portulacastrum from 65 to 85%, after which germination started to decrease, reducing to 71.25% at 45 ºC. Trianthema portulacastrum had maximum germination with distilled water compared with different salt solutions and drought stress levels. Germination was significantly minimum at salinity and drought stress level of 250 mM and -0.8 MPa, respectively....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Temperature; Drought stress; Salt stress; Field capacity; PH; Sowing depth.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000300011
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Germination ecology of wild onion: a rainfed crop weed Planta Daninha
Tanveer,A.; Sibtain,M.; Javaid,M.M.; Ali,H.H..
Asphodelus tenuifolius is becoming a more common weed in rain-fed area in Pakistan. Laboratory and greenhouse experiments were conducted to determine the effect of different environmental factors on germination and emergence of A.tenuifolius. Results showed that A.tenuifolius can tolerate a wide range of varying environmental factors. Greatest percentage of germination (80%) was recorded at 15 ºC constant temperature; however, considerable germination occurred at 20 and 25 ºC. Light for 10 h photoperiod stimulate germination of Asphodelus tenuifolius compared with complete darkness. Germination was totally inhibited at osmotic stress higher than -0.8 MPa. There was no significant difference in germination at pH 6 to 8; however, there was a slightly...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Asphodelus tenuifolius; Temperature; Water stress; Salt stress; PH; Seedling emergence; Seeding depth.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000100008
Registros recuperados: 6
Primeira ... 1 ... Última
 

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