Biology studies and balloonvine (Cardiospermum halicacabum) management were carried out at Embrapa Soybean, Londrina, Paraná, Brazil. Four experiments were conducted under field and greenhouse conditions. The first experiment evaluated growth, development and nutrient demands of the balloonvine plants. The second was conducted under field conditions with balloonvine seeds sowed at several depths to evaluate the capacity of plant emergence. The two other experiments were carried out under greenhouse conditions to evalaute herbicide effectiveness in controlling this species. The highest dry matter accumulation was, in decreasing order, in the stem, leaf and root. Balloonvine presented the following decreasing sequence of nutrient recruitment: N, K, Ca, Mg, S and P. The emergence of balloonvine seedlings occurred from several depths of sowing, including seeds on soil surface up to 12 cm. The treatments 2,4-D (1005 g a.e. ha-1), paraquat (400 g a.i. ha-1), glufosinate-ammonium (300 g a.i. ha-1), lactofen (144 g a.i. ha-1), carfentrazone-ethyl (12 g a.i. ha¹), sulfentrazone (600 g a.i. ha-1) and glyphosate (960 g a.i. ha-1) were efficient in controlling balloonvine up to four leaves.
heartseed; weeds; growth analysis; emergence; chemical control
