Autumn-winter cover crop
effects on yield and corn N accumulation in Southwestern Buenos Aires
Cover crops
(CC) have an effect on nitrogen (N) accumulation and on successive crop yields.
The aim of this study was to evaluate yields, yield components and N
accumulation of maize using as previous crops different CC and evaluating the response
to N fertilization. Five experiments were conductedd on a Typic Argiudioll
(USDA Soil Taxonomy) of Coronel Suárez. The species used as CC were: Oats
(Avena sativa), Hairy vetch (Vicia sativa) and control (chemical fallow). The
experimental design consisted of split-plots in three randomized complete
blocks, with main plots corresponding to the cover crops treatment and subplots
to the fertilizer treatment (N applied at the V4-V6 corn stage). The treatments
in the main plots were the
CC. The effects of CC varied according to the corn yield component.. Hairy
vetch and N fertilization at different rates increased the N absorption
efficiency. A greater N absorption was not always related to increases in corn
yields, probably due to the climatic variability among years. There was a
tendency for greater corn yields with hairy vetch as a preceding cover crop. N
application reduced hairy vetch N recovery during the second year and increased
N recovery during the first and third year. Fertilizer application effects
varied among previous crops with a low response to N when the previous crop was
hairy vetch, a variable response when in fallow and a significant response when
the previous crop was oats.
Cover crops, corn, hairy vetch, clover, oats, yield, nitrogen.
Sá Pereira E. de, J.A. Galantini,
A. Quiroga, M.R. Landriscini. 2014. Efecto de los cultivos de cobertura otoño
invernales, sobre el rendimiento y acumulación de N en maíz en el sudoeste
bonaerense. Ciencia del Suelo 32 (2) 219-231.
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