Efeito de diferentes fontes de água, herbicidas e manejos mecânicos na dessecação do nabo forrageiro e no desempenho produtivo do sorgo granífero

Abstract

This study evaluated the effect of different water sources associated with herbicides on the efficiency of forage radish (Raphanus sativus L.) desiccation and on the productivity of sorghum (Sorghum spp.) cultivated in succession. The experiment was carried out at the Experimental Farm of the Federal Technological University of Paraná (UTFPR), Dois Vizinhos campus, using a randomized block design with nine treatments and three replications. Reservoir water and well water were used in the herbicide spray solutions, associated with glyphosate, ammonium glufosinate and 2,4-D, in addition to mechanical management through mowing and rolling. The evaluations included forage radish green mass production, soil cover, weed infestation, sorghum plant height, panicle mass and grain productivity. The treatments significantly influenced weed emergence and the initial development of sorghum plants. Well water showed greater hardness, indicating a higher concentration of cations such as calcium and magnesium, factors that may reduce herbicide efficiency, especially systemic herbicides. Treatments that provided better soil cover and lower weed interference showed higher values for plant height, panicle mass and grain productivity. In addition, residue management directly influenced the persistence of soil cover and the suppression of weed species. Therefore, the results demonstrate that water quality and the management adopted for forage radish desiccation interfere with sorghum productive performance, providing relevant information for more efficient and sustainable agricultural systems.