Spatial and temporal distribution of weeds in no-tillage system

Revista Brasileira de Engenharia Agricola e Ambiental

Pegoraro, Camilo¹  Oliveira Neto, Antonio M. de²  Guerra, Naiara³  Bottega, Eduardo L.⁴  Queiroz, Daniel M. de⁵ 

[1] Grupo Horita, Luiz Eduardo Magalhães, Brazil;Instituto Federal Catarinense, Rio do Sul, Brazil;Universidade Federal de Santa Catarina, Curitibanos, Brazil;Universidade Federal de Santa Maria, Cachoeira do Sul, Brazil;Universidade Federal de Viçosa, Viçosa, Brazil

关键词: precision agriculture;    spatial variability;    Sonchus oleraceus;    Conyza spp.;    Senecio brasiliensis.;   

DOI  :  10.1590/1807-1929/agriambi.v20n12p1107-1111

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

Brazil is one of the largest grain producers in the world, due to its extensive arable land and favorable climate for the cultivation of any species. The production could be higher, but problems such as competition between crops and weeds reduces crop yields. This study aimed to analyze the spatial distribution of weeds, especially milkweed (Sonchus oleraceus), horse weed (Conyza spp.) and ‘maria-mole’ (Senecio brasiliensis) in an area under no-tillage system for two harvests. The work was carried out during the 2013/14 and 2014/15 crop years in an area of 22.5 ha, where soybean is grown in the summer and oat in the winter. The weeds were mapped using a sampling grid of 85 points. The number of plants present in 0.25 m2 was recorded at each sampling point. The data collected in the field composed the information bank and were used for geostatistical analysis and production of maps. Using geostatistical analysis, it was possible to map the horseweed infestation in the studied area for the 2013/14 season. The species ‘maria-mole’ and milkweed did not show spatial dependence. During the 2014/2015 season, because of the management carried out in the off season, none of the studied species showed spatial dependence.

【 授权许可】

CC BY