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weeds
canadensis including length, surface area, volume, and average diameter are greater than for composite exotic weeds.
      
Information on specific features of distribution and activity of introduced species growing feral and accidental weeds in different forest types is presented.
      
Cultivated plants and weeds in fields of the Penza Volga region in the middle ages
      
Geobotanical investigations demonstrated that the transformation of the species composition of herbs from weeds to predominantly meadow plants occurred in five-ten years after the soil was no more used for farming.
      
The algorithm separates the weed area from soil background according to the color eigenvalue, which is obtained by analyzing the color difference between the weeds and background in three color spaces RGB, rgb and HSI.
      
Effects of linuron and dimethenamid on antioxidant systems in weeds associated with soybean
      
During sexual segregation, males in bull groups used areas with greater per capita abundance of forage, higher proportion of weeds, and less nutritious grasses (as indicated by lower % fecal nitrogen) compared with females in cow or mixed groups.
      
Initial egg population densities were correlated negatively with leaf area index at 84 and 96 DAS in 1996 and 1997, respectively, with implications for growth of and competition from weeds.
      
trifoliophila reproduced on two of the eight dicotyledon weeds, spear thistle (Cirsium vulgare) and pigweed (Portulaca oleraceae).
      
Host status of six major weeds to Meloidogyne chitwoodi and Pratylenchus penetrans, including a preliminary field survey concern
      
A glasshouse experiment was carried out to investigate the host status of six important weeds in intensive agricultural cropping systems to Meloidogyne chitwoodi and Pratylenchus penetrans.
      
These results call attention to the possibility of weeds acting as carriers and point sources of possible high population densities of plant-parasitic nematodes.
      
Weeds represent a heterogeneous group of plants, usually defined by no commercial or aesthetic value.
      
Important allergenic weeds belong to the plant families Asteraceae, Amaranthaceae, Urticaceae, Euphorbiaceae, and Plantaginaceae.
      
Adults survived and oviposited on all tested weeds, suggesting that nymph survival was the limiting factor in host suitability.
      
Weeds may however, interact with the crop to alter leafhopper colonization, dispersal, and/or reproduction.
      
In addition, since some broadleaf weeds are suitable hosts, the leafhopper may have a secondary beneficial role for biological weed control.
      
A similar effect was likely cuased by the stubble and weeds, in no-tillage plots.
      
(Carabidae, Coleoptera) was compared between a strip-managed area (cereal area subdivided by strips of weeds and wild flowering herbs) and a conventionally treated cereal area.
      
Selected weeds were used to attract antagonists of apple aphids in an apple orchard near Berne, Switzerland.
      
 

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