Changes of weed flora in cereal fields over the last 31 years in Van, Turkey

2020 ◽  
Vol 52 (6) ◽  
Author(s):  
Reyyan Yergin Özkan ◽  
Işik Tepe
Keyword(s):  
Weed Flora ◽  
Cereal Fields

scholarly journals May the Inclusion of a Legume Crop Change Weed Composition in Cereal Fields? Example of Sainfoin in Aragon (Spain)

Agronomy ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 134 ◽  
Author(s):  
Alicia Cirujeda ◽  
Ana Isabel Marí ◽  
Sonia Murillo ◽  
Joaquín Aibar ◽  
Gabriel Pardo ◽  
...  
Keyword(s):  
Cereal Crops ◽  
Weed Species ◽  
Winter Cereal ◽  
Onobrychis Viciifolia ◽  
Beneficial Effects ◽  
Legume Crop ◽  
Weed Flora ◽  
Soil Seedbank ◽  
Cereal Fields ◽  
Weed Species Richness

Onobrychis viciifolia (Scop.) (sainfoin) is promoted in the Spanish Aragón region through the Agro-Environmental Schemes (AES) since 2007 with the aim of enhancing biodiversity. Also, in other countries, the interest in this legume crop is growing due to its rusticity and beneficial effects on the soil and livestock. However, the effect of the crop on weed flora in the subsequent cereal crops has hardly been investigated yet. With this aim, weed flora has been characterised in 2011–2014 in sainfoin fields in the second and third year of establishment (S2 and S3), in cereal monocrop (CM), in cereal after sainfoin (CS) and in organic cereal fields (OC). Additionally, the soil seedbank was determined in two years in CM and S3 fields. Weed species richness of emerged flora and of the soil seedbank was highest for sainfoin and lowest for CM, being intermediate for OC and CS regardless of the sampling year. The most feared weed species in winter cereal did not increase by growing sainfoin or in CS compared to CM. Curiously, summer annuals dominated in the soil seedbank. Sainfoin fields cause thus a shift in the weed flora, which does not seem to damage subsequent cereal crops provided fields are mouldboard ploughed after sainfoin.

Landscape and land-use effects on weed flora in Mediterranean cereal fields

2011 ◽  
Vol 142 (3-4) ◽  
pp. 311-317 ◽  
Author(s):  
Laura Armengot ◽  
Laura José-María ◽  
José M. Blanco-Moreno ◽  
Albert Romero-Puente ◽  
F. Xavier Sans
Keyword(s):  
Land Use ◽  
Weed Flora ◽  
Land Use Effects ◽  
Cereal Fields

The Weed Flora of Prince Edward Island Cereal Fields

Weed Science ◽  
1990 ◽  
Vol 38 (2) ◽  
pp. 119-124 ◽  
Author(s):  
A. Gordon Thomas ◽  
Jerry A. Ivany
Keyword(s):  
Prince Edward Island ◽  
Abundant Species ◽  
Sampling Procedure ◽  
Survey Period ◽  
Number Of Species ◽  
Weed Flora ◽  
Annual Grasses ◽  
Cereal Fields ◽  
Broadleaf Species ◽  
A Minor

Field surveys were conducted during 1978 and 1979 to determine the abundance and distribution of weeds in fields seeded to barley, oats, spring wheat, and mixtures of barley and oats in various proportions in the province of Prince Edward Island. Using a stratified random sampling procedure, weeds were counted in 536 fields during the 2-yr survey period. The weed flora had a large number of species that occurred at high densities, probably due to the limited herbicide use on Prince Edward Island. The average total number of species (64), number of species per field (20), and weed density (253 plants/m2) were similar among the four crop types and the five Extension Districts of the province. Only 49 of the 77 species encountered during the survey were found in 5% or more of the fields. Low cudweed, corn spurry, and common lambsquarters were the most abundant species, occurring in more than 80% of the fields at a mean density higher than 33.4 plants/m2. Red sorrel, smartweed, common hempnettle, broadleaf plantain, and quackgrass were also found in 80% or more of the fields, but at a mean density from 14.4 to 16.5 plants/m2. The perennials accounted for 51% of the commonly occurring species, annual and biennial broadleaf species accounted for 43%, and annual grasses were a minor group with only 6% of the species.

Influence of NPK fertilization on weed flora in maize field

2014 ◽  
Vol 63 (1) ◽  
pp. 139-148 ◽  
Author(s):  
Éva Lehoczky ◽  
M. Kamuti ◽  
N. Mazsu ◽  
J. Tamás ◽  
D. Sáringer-Kenyeres ◽  
...  
Keyword(s):  
Plant Nutrition ◽  
Crop Production ◽  
N Availability ◽  
Weed Species ◽  
Negative Effects ◽  
Production Factors ◽  
Maize Field ◽  
Weed Flora ◽  
Npk Fertilization

Plant nutrition is one of the most important intensification factors of crop production. The utilization of nutrients, however, may be modified by a number of production factors, including weed presence. Thus, the knowledge of occurring weed species, their abundance, nutrient and water uptake is extremely important to establish an appropriate basis for the evaluation of their risks or negative effects on crops. That is why investigations were carried out in a long-term fertilization experiment on the influence of different nutrient supplies (Ø, PK, NK, NPK) on weed flora in maize field.The weed surveys recorded similar diversity on the experimental area: the species of A. artemisiifolia, S. halepense and D. stramonium were dominant, but C. album and C. hybridum were also common. These species and H. annuus were the most abundant weeds.Based on the totalized and average data of all treatments, density followed the same tendency in the experimental years. It was the highest in the PK treated and untreated plots, and significantly exceeded the values of NK fertilized areas. Presumably the better N availability promoted the development of nitrophilic weeds, while the mortality of other small species increased.Winter wheat and maize forecrops had no visible influence on the diversity and the intensity of weediness. On the contrary, there were consistent differences in the density of certain weed species in accordance to the applied nutrients. A. artemisiifolia was present in the largest number in the untreated control and PK fertilized plots. The density of S. halepense and H. annuus was also significantly higher in the control areas. The number of their individuals was smaller in those plots where N containing fertilizers were used. Contrary to them, the density of D. stramonium, C. album and C. hybridum was the highest in the NPK treatments.

Control of complex weed flora in direct seeded rice using bispyribac-sodium in combination with other herbicides

2019 ◽  
Vol 11 (3) ◽  
Author(s):  
Anil Khippal ◽  
Jasbir Singh ◽  
Rajender Singh
Keyword(s):  
Weed Flora ◽  
Direct Seeded

The Weed Flora Of Some Crop Fields In Al- Oylia Region, Al-Marj, Libya

2017 ◽  
pp. 1
Author(s):  
Sabah M. Al Hasi ◽  
Yacoub M. El Barasi
Keyword(s):  
Crop Fields ◽  
Weed Flora

IMPACT OF WHEAT ESTABLISHMENT METHODS AND WEED MANAGEMENT PRACTICES ON WEED FLORA, YIELD AND NUTRIENT UPTAKE OF WHEAT IN RICE-WHEAT CROPPING SYSTEM

2019 ◽  
Vol 6 (02) ◽  
Author(s):  
MOHAN SINGH ◽  
OMBIR SINGH ◽  
ROHITASAV SINGH
Keyword(s):  
Nutrient Uptake ◽  
Weed Management ◽  
Conventional Tillage ◽  
Research Centre ◽  
Zero Tillage ◽  
Phalaris Minor ◽  
Weed Population ◽  
Metsulfuron Methyl ◽  
Transplanted Rice ◽  
Weed Flora

A field experiment was conducted at the Crop Research Centre of Govind Ballabh Pant University of Agriculture and Technology Pantnagar, Udham Singh Nagar during continuous two years to study the weed flora, yield and nutrient uptake of wheat (Triticum aestivum L.) under different wheat establishment methods in main plots and seven weed management in sub plots. Phalaris minor was the most dominant weed at 60 DAS contributed 55.0 per cent of total weed population. Melilotusindica was the major non grassy weeds in wheat which contributed 11 per cent to total weed population during respective years. Sowing of wheat with zero tillage significantly reduced the Phalaris minor density as compared to conventionally tilled wheat after transplanted rice, 60 per cent Phalaris minor emerged from 0-3 cm in reduced and conventional tillage where as in zero tillage after transplanted rice there was 55 per cent emergence from 0-3 cm layer.The highest grain yield was obtained in two hand weedings done at 30 and 60 DAS and was at par with Isoproturon 1.0 kg ha-1 + Metsulfuron methyl 4 g ha-1 at 30 DAS and Clodinafop – Propargyl 60 g ha-1 at 30 DAS fb. Metsulfuron methyl 4 g ha-1 at 37 DAS. Zero tillage resulted in significantly higher uptake of NPK by wheat plants as compared to conventional tillage, whereas reduced tillage recorded minimum NPK, which was significantly lower over the other treatments of wheat establishment methods.

scholarly journals Weed Flora and Soil Seed Bank Composition as Affected by Tillage System in Three-Year Crop Rotation

Agriculture ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 186 ◽  
Author(s):  
Beata Feledyn-Szewczyk ◽  
Janusz Smagacz ◽  
Cezary A. Kwiatkowski ◽  
Elżbieta Harasim ◽  
Andrzej Woźniak
Keyword(s):  
Winter Wheat ◽  
Crop Rotation ◽  
Seed Bank ◽  
Soil Seed Bank ◽  
Soil Layer ◽  
Agricultural Science ◽  
No Till ◽  
Weed Flora ◽  
Weed Seeds ◽  
Direct Sowing

In recent years, there has been an increasing interest around agricultural science and practice in conservation tillage systems that are compatible with sustainable agriculture. The aim of this study was to assess the qualitative and quantitative changes in weed flora and soil seed bank under reduced tillage and no-till (direct sowing) in comparison with traditional ploughing. In the crop rotation: pea/rape—winter wheat—winter wheat the number and dry weight of weeds increased with the simplification of tillage. The seed bank was the largest under direct sowing and about three times smaller in traditional ploughing. Under direct sowing, most weed seeds were accumulated in the top soil layer 0–5 cm, while in the ploughing system most weed seeds occurred in deeper layers: 5–10 and 10–20 cm. In the reduced and no-till systems, a greater percentage of perennial and invasive species, such as Conyza canadensis L., was observed. The results show that it is possible to maintain weed infestation in the no-till system at a level that does not significantly affect winter wheat yield and does not pose a threat of perennial and invasive weeds when effective herbicide protection is applied.

Chemical weed control in potatoes

1966 ◽  
Vol 67 (2) ◽  
pp. 239-242
Author(s):  
Maurice Eddowes
Keyword(s):  
Weed Control ◽  
Soil Type ◽  
Effective Control ◽  
Herbicide Treatment ◽  
Weed Flora ◽  
Annual Weeds

Dinoseb and TCA were successfully used to control weeds in potatoes by Robertson (1960), and Wood, Sutherland & Stephens (1960). Since then many investigations have been carried out on the use of newer herbicides including the bipyridils, triazines and substituted ureas. The results of a number of these studies, presented at the Seventh British Weed Control Conference (1964), suggested that herbicides might give effective control of annual weeds in potatoes under a range of British conditions. Yields of marketable ware following herbicide treatment were similar, in general, to those obtained following standard post-planting cultivations, but occasionally the yields after herbicide treatment were either as much as 20% higher or lower than the controls. The performance of the herbicides was related mainly to weed flora, soil type and amount and distribution of rainfall.

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