Abstract
ABSTRACT The presence of weeds as a consequence of pasture degradation is one of the main problems facing livestock worldwide. Thus, knowing the interference aspects and the appropriate time for weed management is essential for applying a particular control measure. This research aimed to study the weed interference on the morphostructural and nutritional quality of the Marandu palisade grass in conditions of renewal or maintenance of pasture. The experiments were conducted in a randomized block design, with four replicates and treatments consisted of eight growth periods of coexistence between Marandu palisade grass and weeds (0, 15, 30, 45, 60, 75, 90, and 120 days). Forage grass was characterized at the end of the experimental period, corresponding to 120 days of coexistence, and the main morphostructural and nutritional components were determined. Under the renewal or maintenance process, the weeds interfere in the morphostructural and nutritional quality of pasture areas with Marandu palisade grass. In vitro organic matter digestibility of Marandu palisade grass is negatively influenced by weeds, suggesting that control measures for renewal or maintenance areas should be adopted within 24 and 18 days of coexistence, respectively.
Highlights
Material and MethodsThe increase in the world population and, in demand for food will require intense changes in the agricultural sector, including greater diversification and production efficiency (Röös et al, 2017)
As far as green leaf dry matter (GLDM) is concerned, there was a significant difference on the 15th day of coexistence with weeds, with reductions of approximately 65% between the period of 0 to 120 days, in both areas of conduction of this experiment
This study showed that, in addition to decreased total dry matter production resulting from weed competition, there was a change in the photoassimilate partition, being most of the photoassimilates produced by the forage grass were used for stalk production, which has lower nutritional quality (Bottega et al, 2017)
Summary
The increase in the world population and, in demand for food will require intense changes in the agricultural sector, including greater diversification and production efficiency (Röös et al, 2017). It is performed by mowers attached to tractors This method has the advantage of recovering pasture structure by renovating the tiller population (Marchi et al, 2020), the maintenance process is considered to be nonselective for forage grasses. It favors the germination of weed propagules present in the soil seed bank (Victória Filho et al, 2014). The sprays were applied with a CO2-pressurized backpack sprayer containing a spray bar fitted with four XR 11002 fan tips and calibrated to provide a spray volume equivalent to 150 L ha-1 Both areas were enclosed with the help of a smooth wire fence to prevent access by animals and the possible grazing of the forage grass. According to the F-test, the regression model was selected based on the highest value of the coefficient of determination (R2) at p ≤ 0.05 while respecting the biological response
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