Sowing depth and light intensity in the emergence and development of monocotyledonous weeds
Open Access
- 23 September 2022
- journal article
- research article
- Published by EDUFU - Editora da Universidade Federal de Uberlandia in Bioscience Journal
- Vol. 38, e38083
- https://doi.org/10.14393/bj-v38n0a2022-60820
Abstract
This study aimed to evaluate the effects of different sowing depths and light intensities on the emergence and development of the monocot weed species, Urochloa decumbens and Cenchrus echinatus, under field conditions. Each species constituted an experiment, and the experimental design was completely randomized with four replicates. 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 solar radiation intensities (100%, 70%, 50%, and 30%) obtained through the use of shading screens. Seedling emergence capacity was evaluated daily to obtain the emergence percentage and speed index. Plant height, floral induction time, and plant dry matter at flowering were measured. Even when subjected to different solar radiation intensities, U. decumbens and C. echinatus seedlings emerged at all the sowing depths. Sowing between 2.0- and 4.0-cm depths favored the emergence of seedlings of U. decumbens and C. echinatus. However, sowing at 12-cm depth reduced the emergence of both species regardless of the solar radiation intensity. Urichloa decumbens plants grown under conditions of greater shading showed the lowest values of height and dry matter accumulation during flowering. High levels of shading facilitated only the etiolation of C. echinatus plants. Increased shading flowering time in both species compared to full sunlight.Keywords
This publication has 9 references indexed in Scilit:
- Straw interference in the emergence of talquezal seeds from different originsAdvances in Weed Science, 2020
- Growth of Tree Species in Coexistence with Palisade Grass Urochloa brizantha (Hochst. ex A. Rich.) Stapf CV. MaranduAdvances in Weed Science, 2019
- Emergence of Razor Grass on the Basis of Origin and Seed Depth in the Soil ProfileAdvances in Weed Science, 2019
- Germination of Stigmaphyllon blanchetii Seeds in Different Temperatures and LuminosityAdvances in Weed Science, 2019
- Light exposure time and light quality on seed germination of Vellozia species (Velloziaceae) from Brazilian campo rupestreFlora, 2018
- Interference of weeds on seedlings of four neotropical tree speciesActa Scientiarum. Agronomy, 2015
- Germinação de sementes de Emilia coccinea (Sims) G. DON em função da luminosidade, temperatura, armazenamento e profundidade de semeaduraSemina: Ciências Agrárias, 2013
- Profundidade de semeadura, pH, textura e manejo da cobertura do solo na emergência de plântulas de Rottboellia exaltataSemina: Ciências Agrárias, 2012
- Densidades de palha e condições de luminosidade na germinação de sementes de Euhphorbia heterophyllaSemina: Ciências Agrárias, 2012