Reproduction of cleavers (Galium aparine L.) under different densities and nitrogen rates
2008
Nakova, R., Plant Protection Institute, Kostinbrod (Bulgaria)
The experiments were conducted to study the reproduction of cleavers (Galium aparine L.) under different densities and nitrogen fertilizer rates. Measurement data on cleavers included: plant height, dry weight, number of seeds and seed weight per plant at maturity. The effect on Galium 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 Galium 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 and 300 kg N/ha resulted in an increase in reproductive abilities of the weed due to its high biomass production. The relationship between Galium aparine L. density and different nitrigen rates in terms of reproduction was largely dependent on weed density, nitrogen levels and intraspecific competition. The coefficients of determination were very high, ranging from 0.94 to 0.99. Regression analysis of the data showed that Galium aparine L. reproduction was linearly affected by cleaver densities and nitrogen rates. Regression models may have practical application in predicting reproduction of Galium aparine L. at different densities and nitrogen rates of application.
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