Abstract
ABSTRACT: Weeding is expensive and laborious, and some weeds may re-establish themselves afterwards. Arboreal leguminous plants can control weeds, and fertilization with nitrogen can increases the competitive ability of the maize. The aim of this work was to evaluate the effects of weed-removal and intercropping with sabiá (Mimosa caesalpiniifolia) on control of weed plants and maize productivity. A randomized complete block design in a split-plot arrangement was used with five replications. Cultivar AG 105, fertilized with nitrogen (30 and 120 kg/ha of N applied to the plots) was subjected to the following treatments (subplots): A) no weeding; B) intercropping with sabiá (30 viable seeds/m2, broadcast between the rows of maize); C) hoeing {20 and 40 days after sowing (DAS)} with no removal of weeds (nROW); D) two hoeings at 20 and 40 DAS with ROW at 20 DAS; E) two hoeings at 20 and 40 DAS with ROW at 40 DAS; F) and two hoeings at 20 and 40 DAS with ROW after each hoeing. Increasing the dose of nitrogen reduced the growth of the sabiá (30%) and weeds (32%) and increased the corn green ear yield (115%) and grain yield (40%) of maize. Sabiá did not reduce the growth of weeds, but it was beneficial to corn because increased the number of green ears. Carrying out two hoeings, with or without the removal of weeds, reduced weed growth (92%) and provided the highest yields of green ears (5.6 t/ha) and grains (6.0 t/ha).
Highlights
As capinas são caras e trabalhosas e algumas plantas daninhas podem se “reestabelecer” após as capinas
These results have encouraged studies of maize intercropping with Gliricidia (Silva et al, 2009a, 2009b), a perennial leguminous plant native to Mexico (Drumond & Carvalho Filho, 2005)
With the application of 120 kg/ha of N, weed control had no effect on the growth and yield of green ears, indicating that nitrogen improves the competitive capacity of the maize (Silva et al, 2010a)
Summary
As capinas são caras e trabalhosas e algumas plantas daninhas podem se “reestabelecer” após as capinas. The soil covering with branches of Gliricidia (Gliricidia sepium) had no allelopathic effect on the maize, but did reduce the weed population (Kamara et al, 2000) These results have encouraged studies of maize intercropping with Gliricidia (Silva et al, 2009a, 2009b), a perennial leguminous plant native to Mexico (Drumond & Carvalho Filho, 2005). With the application of 120 kg/ha of N, weed control had no effect on the growth and yield of green ears, indicating that nitrogen improves the competitive capacity of the maize (Silva et al, 2010a). The objective of this work was to evaluate the effects of removing weeds (using a rake) from the field after hoeing and of intercropping with sabiá on weed control and the yield of the maize cultivar AG 1051 when subjected to the application of nitrogen
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