Abstract
ABSTRACT 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 aLatossolo 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 sown in January had higher industrial quality; however, there was stalk yield reduction when bulk density was greater than 1.26 Mg m-3, with a maximum yield of 50 Mg ha-1 in this sowing time. Cultivation of sweet sorghum as a second crop is a promising alternative, but care should be taken in cultivation under conditions of pronounced climatic risks, due to low stalk yield.
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Claims 6
Claim · model-written summary
Sweet sorghum sown in January had higher industrial quality.
Not reportedComparator
Verbatim
t0“SWEET SORGHUM PERFORMANCE AFFECTED BY SOIL COMPACTION”
e0“The crop sown in January had higher industrial quality”
Claim · model-written summary
Stalk yield was reduced when bulk density was greater than 1.26 Mg m-3.
Verbatim
t0“SWEET SORGHUM PERFORMANCE AFFECTED BY SOIL COMPACTION”
e1“there was stalk yield reduction when bulk density was greater than 1.26 Mg m-3”
Claim · model-written summary
Sweet sorghum reached a maximum yield of 50 Mg ha-1 in the January sowing time.
Verbatim
t0“SWEET SORGHUM PERFORMANCE AFFECTED BY SOIL COMPACTION”
e2“with a maximum yield of 50 Mg ha-1 in this sowing time”
Claim · model-written summary
Crop yield was directly associated with soil water content.
Verbatim
t0“SWEET SORGHUM PERFORMANCE AFFECTED BY SOIL COMPACTION”
e3“crop yield is directly associated with soil water content”
Claim · model-written summary
Frequency of soil water content within the LLWR decreased as agricultural traffic increased.
Verbatim
t0“SWEET SORGHUM PERFORMANCE AFFECTED BY SOIL COMPACTION”
e4“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)”
Claim · model-written summary
Cultivation of sweet sorghum as a second crop is a promising alternative, with care under pronounced climatic risks.
Verbatim
t0“SWEET SORGHUM PERFORMANCE AFFECTED BY SOIL COMPACTION”
e5“Cultivation of sweet sorghum as a second crop is a promising alternative”
The same questions in other papers
sowing time · quality: general · SorghumPositive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.