Artículos de revistas
Sowing depth and light intensity on the emergence and development of weeds
Profundidade de semeadura e intensidade luminosa na emergência e desenvolvimento de espécies de plantas daninhas
Fecha
2022-01-01Registro en:
Revista Ciencia Agronomica, v. 53.
1806-6690
0045-6888
10.5935/1806-6690.20220008
2-s2.0-85120962419
Autor
Universidade Estadual Paulista (UNESP)
Faculdade de Tecnologia de Capão Bonito
Universidade Federal de Mato Grosso/UFMT
Institución
Resumen
Weeds are one of the ecological factors that directly affect agricultural costs. Thus, understanding the emergence and development of these species is essential for the decision-making on weed control strategies. This study aims to evaluate the effect of different sowing depths and luminous intensities under field conditions on the emergence and development of the Acanthospermum australe (Loefl.) Kuntze and Ipomoea grandifolia (Dammer) O’Donell. Each species constituted one experiment, and the completely randomized design with four repetitions was adopted. The treatments were arranged in a 6 x 4 factorial scheme, with six sowing depths (0.5; 1.0; 2.0; 4.0; 8.0; and 12.0 cm) associated with four luminous intensities (100%, 70%, 50%, and 30% sunlight) obtained using shade cloths. The emergence of seedlings was evaluated daily to obtain the emergence and the emergence speed index. Plant height(length), the period until flower induction, and the dry matter of plants during flowering were also analyzed. A. australe and I. grandifolia emerge under the luminous intensities of 100, 70, 50, and 30% of solar radiation and in sowings depths up to 12.0 cm. Nevertheless, A. australe is the only one affected by luminous intensity, sowing depth, and the interaction between both factors in all the analyzes conducted. Luminous intensity reduction leads to lower development of I. grandifolia.