Abstract
Field experiments were conducted at the Plant Protection Institute to study the reproduction of cleavers (Galium aparine L.) under different densities and nitrogen fertilizer rates. The treatments consisted of five G. aparine L. densities (D11; D2 5; D3 10; D4 15; D5 20 plants m2) and three nitrogen rates (N1 0 ; N2 200; N3 300 kg N /ha-1). Measurement data on cleavers included: plant height, dry weight, number of seeds and seed weight per plant at maturity. The effect on G. aparine L. reproduction was established. An increase in weed density leads to a decrease in height, dry weight, seeds number and weight per plant. The rate of nitrogen application is an important factor in determining G. aparine L. seed production, but its influence varies as a function of weed density. Under all densities of cleavers the increase in nitrogen rates to 200 kg N/ha-1 and 300 kg N/ha-1 resulted in an increase in reproductive abilities of the weed due to its high biomass production. The relationship between G. aparine L. density and different nitrogen rates in terms of reproduction was largely dependent on weed density, nitrogen levels and intraspecific competition. The coefficients of determination (R2) were very high, ranging from 0.94 to 0.99. Regression analysis of the data showed that G. aparine L reproduction was linearly affected by cleaver densities and nitrogen rates. Regression models may have practical applications in predicting reproduction of G. aparine L. at different densities and nitrogen rates of application.
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Claims 8
Claim · model-written summary
Increasing cleavers density decreased plant height, dry weight and seed number.
Verbatim
e0“cleavers (Galium aparine L.)”
e1“An increase in weed density leads to a decrease in height, dry weight, seeds number and weight per plant”
Claim · model-written summary
Increasing cleavers density decreased seed weight per plant.
Verbatim
e0“cleavers (Galium aparine L.)”
e1“An increase in weed density leads to a decrease in height, dry weight, seeds number and weight per plant”
Claim · model-written summary
Nitrogen effects on seed production varied with weed density.
Not reportedDirection
Verbatim
e0“cleavers (Galium aparine L.)”
e1“rate of nitrogen application is an important factor in determining G. aparine L. seed production, but its influence varies as a function of weed density”
Claim · model-written summary
Nitrogen rates of 200 and 300 kg N/ha-1 increased cleavers reproductive ability at all densities.
- Taxon
- cleaverse0
- Treatment
- 200 kg N/ha-1 and 300 kg N/ha-1e1
- Outcome
- reproductive abilities of the weede1
- Direction
- increasee1
Not reportedComparator
Verbatim
e0“cleavers (Galium aparine L.)”
e1“Under all densities of cleavers the increase in nitrogen rates to 200 kg N/ha-1 and 300 kg N/ha-1 resulted in an increase in reproductive abilities of the weed due to its high biomass production”
Claim · model-written summary
High biomass production was asserted to explain enhanced reproduction under nitrogen.
Verbatim
e0“cleavers (Galium aparine L.)”
e1“increase in reproductive abilities of the weed due to its high biomass production”
Claim · model-written summary
Regression fits for cleavers reproduction had R2 values of 0.94 to 0.99.
Not reportedDirection
Verbatim
e0“cleavers (Galium aparine L.)”
e1“coefficients of determination (R2) were very high, ranging from 0.94 to 0.99”
Claim · model-written summary
Regression showed a linear relationship of reproduction to cleavers density and nitrogen rate.
Not reportedDirection
Verbatim
e0“cleavers (Galium aparine L.)”
e1“G. aparine L reproduction was linearly affected by cleaver densities and nitrogen rates”
Claim · model-written summary
Regression models may predict cleavers reproduction under different density and nitrogen rates.
Verbatim
e0“cleavers (Galium aparine L.)”
e1“Regression models may have practical applications in predicting reproduction of G. aparine L. at different densities and nitrogen rates of application”