Weed Management with Urochloa ruziziensis in Three Sowing Methods

Abstract

This research aimed at investigating which sowing method is more suitable for the deployment of Urochloa ruziziensis to suppress the weed community in no-tillage. The design was a randomized block ones, with a 3 x 2 factorial design, in which the first factor was composed of three sowing methods (broadcast, broadcast with incorporation or line sowing) and factor B consisted in the application and non-application of the herbicide 2,4-D. On day 30 and 60 after sowing (DAS), the relative importance of the present plant species was determined. On day 120 and 180 DAS, the accumulation of biomass and the plant cover percentage on the soil provided by the cover crop and weed species were determined. Moreover, on day 180 DAS, the density of the existing weeds was determined. The weed with the highest occurrence in the area was Conyza canadenses, and the lowest percentage of soil covering by signalgrass and the greates occurrence of weeds occurred with broadcast seeding. It is possible to conclude that the broadcast seeding with the incorporation of signalgrass seeds and line sowing methods provide enough plant cover to suppress weed species, avoiding the application of the herbicide 2,4-D in order to suppress the infesting community.

Management and development of fleabane plants in central Brazil

“…Experiment 4 was conducted to complement the study on the soybean crops grown after winter maize. The maize grain were harvested and left 10.9 to 18.6 Mg ha -1 of plant residues on the soil, which are satisfactory to inhibit germination or emergence of fleabane plants, based on their biological characteristics (Bajwa et al, 2016;Timossi et al, 2018;Vidal et al, 2007;Wu et al, 2007;Zinzolker et al, 1985). However, the fleabane plants in the area had been subjected to an ineffective chemical control in the maize crop, which only had their growth inhibited and their cycle delayed due to the maize canopy closure.…”

Clearfield upland rice intercropped with Urochloa ruziziensis for grain, increased revenue and environmental preservation

“…Moreover, this type of intercropping could generate other benefits, such as straw formation for the no‐tillage system (Andrade et al., 2020; Borges et al., 2016), weed suppression (Buffara et al., 2018; Timossi et al., 2018), soil protection and maintenance of its moisture (Buffara et al., 2018), besides soil carbon sequestration and greenhouse gases mitigation (Amadori et al., 2022; Bratti et al., 2022).…”

Investigation of the effectiveness of AC/DC electric current as a weed control method using NDVI technique

“…It is also important to know which method is more suitable for which weed control by comparing mechanical, physical and chemical weed control methods (Faleiro et al, 2022). Some of the electrical/mechanical, weed control methods are the electric arc (current) method, the microwave method, hot steam, infrared, a pneumatic system, freeze-drying, and the laser cutting method, three sowing methods (Timossi et al, 2018). The electric current method is known to increase the heat of weed seeds (Nelson, 1996) in a short period, causing fading of the plant stem and leaves, and then the plants are completely biologically inactive (Wayland et al, 1975).…”