Studies on applicability of Amaranthus paniculatas Rajgeeraa starch for custard preparation. The 21 day planting resulted in weed and crop coexisting with neither becoming dominant. The amaranth seedling emergence was very sparse in the fall experiment until two to three weeks after the crop was planted. However, relative yield analysis suggested that the competitive ability of lettuce was improved by increased P fertility. In these studies with lettuce and spiny amaranth, however, essentially only the growth of lettuce was found to be influenced by P fertility. Each of these methods is useful for answering a unique set of questions Cousens,

This suggests that interference for light between plants may have been a factor involved in the biomass responses to density. You are commenting using your Twitter account. Lettuce is particularly sensitive to phosphorus supply during early growth. Log transformation was made after adding 1 to data values. Instead of being applied to the entire study area, fertilizer P was applied as an experimental treatment. The source of the interaction, however, was not detected.

Environmental concerns, among others, call for reduced fertilizer application due to its potential adverse effect on wetland ecosystems which are closely linked to agricultural lands.

Literature review on amaranthus hybridus

Phosphorus concentration data for these leaf samples are given in Table 3. Aldrich cites that environmental conditions would preclude competition for CO2 and In situations where water and nutrients are adequate, light is the factor that will ultimately determine plant growth Gardner et al. The crop responds to each of P and K amendment in a predictable manner on these soils Sanchez and Burdine, For the latest planting the crop replaced the weed.

Environmental factors or factors related to weed presence may influence the time required to reach the density independent stage, which in turn influences the length of time over which the maximum biomass production rate occurs. The influence of ground cover species on apple Malus pumila Miller seedlings was studied by Shribbs et al. Biomass of amaranth removed from lettuce at 21 days after plot establishment was greater where P was applied banded or broadcast than where no P applied.


Thus, P concentration in spiny amaranth does not appear to have been a limiting factor to growth of the plant, as reflected by biomass, in these studies. In response to a proposal that weed competition for nutrients could be compensated for by increased fertilization, Alkamper reviewed literature on the influence that fertilization has on crops and weeds and the control of weed infestations.

A replacement study design at a series of densities was used for these studies. With the earliest barley planting, the crop progressively suppressed the weed.

literature review on amaranthus hybridus

This may have been due to revidw at the soil surface being inadequate for weed seed germination to occur. Redroot pigweed has been found to respond to P more so than several other warm season weeds Hoveland et al.

Deionized water was applied to the surface as needed in order to keep the vermiculite moist until seedling emergence was complete. Reveiw was found to increase as often as it decreased, leading Wilson to conclude that there is “no case for using the concept of reduced competition effects at higher resource levels in the interpretation of ecological processes or experimental results”.

Phosphorus concentrations in the fall study were influenced by duration of weed interference but not the other experimental factors Table 3. Spiny amaranth biomass, on the other hand, was only marginally influenced by P fertilization. Literature review on amaranthus hybridus 19 feet 2 inch amaranth hybridus. Plants were thinned to 1 every 30 cm at the times indicated in Table 3.

Since little detailed information on the effect of weeds on lettuce is available, studies were designed to assess both the effect of weed density and duration of weed presence on the crop under several fertilizer P application regimes.


With added K, however, desmodium growth was only marginally suppressed by setaria. In the fall experiment no interactions were found between the main effects Table 3.

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By including varied fertility as a factor, the results give an indication of how component plants of the mixture fare in extracting the nutrient in the presence of the other species.

Consequently, competition for mobile resources could begin sooner than for teview mobile ones. Lettuce yields were also influenced by fertilization such that application by either method resulted in yield increases of approximately percent.

literature review on amaranthus hybridus

The interactions between the experimental factors for K concentration did not appear to be meaningful. Three of the interaction types, competition, amensualism allelopathyy and parasitism are of a negative nature.

Otherwise cylinders were constructed of hexagonal wire mesh with 2. These studies showed that equivalent yields can be obtained with two thirds lower fertilizer P rates if the nutrient is applied in a band rather than broadcast.

These series can be established at each of several levels for the set density component of a series Vleeshouwers et al. It is boiled, then served with olive oil and lemon juice like hybrieus salad, sometimes alongside fried fish.

These are also of particular importance to crop production.

In the experiment no differences were found between the band and broadcast application methods for untrimmed lettuce. This was because reivew P in the root 83 microenvironment was not altered by P uptake for a distance greater than 1 mm away from the root.