Journal Article

Influence of narrow row/high population corn (Zea mays) on weed control and light transmittance

Teasdale, J.R. (USDA, ARS, Beltsville, MD.)

1995

Overview

Field experiments were conducted from 1989 to 1992 to determine whether no-tillage corn grown in 38-cm rows and a 2× population could improve weed control relative to 76-cm rows and 1× population under reduced-herbicide options. A standard treatment including 1.12 kg ai/ha of atrazine plus 2.24 kg ai/ha of metolachlor was compared with a treatment including the same herbicides applied at 25% of the standard rates. Both treatments included 0.56 kg ai/ha of paraquat which controlled annual weeds established at the time of application. Weed control was less in the 25%-herbicide treatment than in the standard treatment in two of four years when corn was grown in 76-cm rows with a 1× population. The 25%-herbicide treatment provided weed control and grain yields similar to the standard treatment in each year when corn was grown in 38-cm rows with a 2× population. Weed control was poor and yield was reduced when no herbicides were applied regardless of row spacing or population. The leaf canopy of corn in the 38-cm row/2×-population treatment reduced light transmittance 1 wk earlier than corn in the 76-cm row/1×-population treatment.

• Publisher: Weed Science Society of America
• Subject: ABSORBANCE / ABSORBANCIA / AGRICULTURA DE BAJO INSUMO / AGRICULTURE FAIBLE NIVEAU INTRANTS / application rate / APPLICATION RATES / ATRAZINA / ATRAZINE / Biological and medical sciences / CERO-LABRANZA / CHEMICAL CONTROL / COMPETICION VEGETAL / COMPETITION VEGETALE / CONTENIDO DE AGUA EN EL SUELO / CONTROL CULTURAL / CONTROL QUIMICO / CROP DENSITY / CROP YIELD / crop-weed competition / CULTURAL CONTROL / DENSIDAD DE LA POBLACION / DENSITE DE POPULATION / DESHERBAGE / DOSE D'APPLICATION / DOSIS DE APLICACION / EFFICACY / ESCARDA / ESPACEMENT / ESPACIAMIENTO / Fundamental and applied biological sciences. Psychology / GRAIN / grains / GRANOS / INTEGRATED CONTROL / LIGHT / LIGHT RELATIONS / LOW INPUT AGRICULTURE / LUCHA INTEGRADA / LUMIERE / LUTTE CHIMIQUE / LUTTE CULTURALE / LUTTE INTEGREE / LUZ / MALEZAS / MARYLAND / MAUVAISE HERBE / METOLACHLOR / METOLACHLORE / METOLACLORO / no-tillage / NON TRAVAIL DU SOL / Parasitic plants. Weeds / Phytopathology. Animal pests. Plant and forest protection / PLANT COMPETITION / plant density / POPULATION DENSITY / RENDEMENT DES CULTURES / RENDIMIENTO DE CULTIVOS / ROW SPACING / SOIL WATER CONTENT / SPACING / TENEUR EN EAU DU SOL / transmittance / WEED CONTROL / WEEDS / ZEA MAYS / ZERO TILLAGE