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Agricultura Técnica

versión impresa ISSN 0365-2807

Resumen

HETZ H, Edmundo; DE LA CERDA A, Janette  y  LOPEZ R, Marco. Straw Availability in the Wheat Stubbles of Three Provinces of Chile. Agric. Téc. [online]. 2006, vol.66, n.4, pp.393-401. ISSN 0365-2807.  http://dx.doi.org/10.4067/S0365-28072006000400008.

The straw left in the wheat (Triticum aestivum L.) stubbles after harvest presents great difficulties to the following tillage or direct seeding operations. The objectives of this work were to determine the quantities of straw available in the wheat stubbles and to assess the quantities of straw that could be collected by balers from the swath left by the combine harvester. Measurements were taken during January and February of 2005 in 15 farms located in the provinces of Linares, Ñuble and Malleco. The main data collected included quantities of straw left by the harvester in the swath, the straw left standing, the harvester´s cutting width and height, wheat height, and straw moisture content. The results showed straw densities in the swath between 0.552 and 2.686 kg m-1, directly related to the harvester cutting width, which gave a range of 1.5 to 4.5 t ha-1, with a mean near 2.5 t ha-1, for a country total near one million tonnes. The quantities of straw left standing fluctuated between 1.6 and 5.1 t ha-1. The average total straw left in the field reached 6.4 t ha-1, for a country total of 2.7 million tonnes. Direct significant correlations were found between cutting width and straw in the swath, between cutting height and straw left standing, between wheat height and total straw, and between this total and wheat yield

Palabras clave : straw; stubble; swath.

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