RESIDUE EFFECT YOUNG OAT PLANTS AS SOIL COVER ON INITIAL GROWTH OF MAIZE
Abstract
In order to evaluate the effect of nitrogen supply in black oat (Avena strigosa) and the quantity of oat straw as a soil cover on initial growth of maize plants, a trial was conducted in greenhouse conditions, in Porto Alegre/Rio Grande do Sul, Brazil. Treatments consisted of three nitrogen level (0, 15 and 40 kg/ha) applied at the beginning of the tillering stage of oat and two amounts of oat straw as soil cover ( 3 and 6 t/ha). One treatment without oat straw was included. Nitrogen fertilization in oat increased dry matter yield and nitrogen uptake by plant and decreased carbon/nitrogen ratio of oat straw. The increase of the nitrogen level applied on oat and the oat straw quantity used as soil cover increased height, dry matter production and nitrogen uptake by com plants. The variables analysed in com plants were higher in the treatments with soil cover than in the check without soil cover.
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