Sweet SorghuM PerforManCe affeCted by Soil CoMPaCtion and Sowing tiMe aS a SeCond CroP in the brazilian Cerrado
نویسنده
چکیده
increasing attention has recently been given to sweet sorghum as a renewable raw material for ethanol production, mainly because its cultivation can be fully mechanized. however, the intensive use of agricultural machinery causes soil structural degradation, especially when performed under inadequate conditions of soil moisture. the aims of this study were to evaluate the physical quality of a Latossolo Vermelho Distroférrico (oxisol) under compaction and its components on sweet sorghum yield forsecond cropsowing in the brazilian Cerrado (brazilian tropical savanna). the experiment was conducted in a randomized block design, in a split plot arrangement, with four replications. five levels of soil compaction were tested from the passing of a tractor at the following traffic intensities: 0 (absence of additional compaction), 1, 2, 7, and 15 passes over the same spot. the subplots consisted of three different sowing times of sweet sorghum during the off-season of 2013 (20/01, 17/02, and 16/03). Soil physical quality was measured through the least limiting water range (llwr) and soil water limitation; crop yield and technological parameters were also measured. Monitoring of soil water contents indicated a reduction in the frequency of water content in the soil within the limits of the LLWR (Fwithin) as agricultural traffic increased (t0 = t1 = t2>t7>t15), and crop yield is directly associated with soil water content. the crop Received for publication on February 24, 2015 and approved on July 13, 2015. DOI: 10.1590/01000683rbcs20150121
منابع مشابه
Influence of Sowing Times, Densities, and Soils to Biomass and Ethanol Yield of Sweet Sorghum
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