Abstract
Fifteen experiments were conducted between 1976 and 1978 to determine the response of grain sorghum to row spacing and population density over a range of soil types, planting dates and seasonal conditions. One experiment was at Kununurra, Western Australia, and the rest were in southern and central Queensland. The trials virtually covered the full range of growing conditions likely to be experienced in the sorghum growing area. Narrow and standard single rows (0.33 m to 1.07 m spacings) yielded as well as or better than more widely spaced (1.50 to 4.27 m) single or twin rows (0.33 or 0.36 m apart) at equivalent population densities over a wide range of yield levels. Only at yield levels below 900 kg ha-l was there a trend for 2.00 or 2.13 m twin rows to outyield the 0.33 or 0.36 m single row spacing. Significant yield reductions resulted in a number of trials, at yield levels above 1600 kg ha-l, from the use of wide row spacings. Where there was severe water stress, grain yields were also reduced by high population densities (>150,000 plants ha-l), particularly at the 0.33 or 0.36 m row spacing. There was no evidence that response to row spacing differed between cultivars. In the one experiment where it was studied, root pruning had no effect on grain yield under conditions of ample moisture supply, but yield was reduced by root pruning of wide row sorghum (1.8 m spacing) under conditions of moisture stress.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Narrow and standard single rows yielded as well as or better than more widely spaced rows at equivalent population density.
- Treatment
- Narrow and standard single rows (0.33 m to 1.07 m spacings)e0
- Outcome
- yielded as well as or bettere0
- Direction
- as well as or bettere0
- Qualifier
- at equivalent population densitiese0
- Comparator
- more widely spaced (1.50 to 4.27 m) single or twin rowse0
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Narrow and standard single rows (0.33 m to 1.07 m spacings) yielded as well as or better than more widely spaced (1.50 to 4.27 m) single or twin rows (0.33 or 0.36 m apart) at equivalent population densities over a wide range of yield levels”
t0“sorghum”
Claim · model-written summary
Below 900 kg ha-l yield, 2.00 or 2.13 m twin rows tended to outyield 0.33 or 0.36 m single rows.
- Treatment
- 2.00 or 2.13 m twin rowse0
- Outcome
- outyielde0
- Direction
- outyielde0
- Qualifier
- below 900 kg ha-le0
- Comparator
- 0.33 or 0.36 m single row spacinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only at yield levels below 900 kg ha-l was there a trend for 2.00 or 2.13 m twin rows to outyield the 0.33 or 0.36 m single row spacing”
t0“sorghum”
Claim · model-written summary
Wide row spacing significantly reduced yield in several trials above 1600 kg ha-l.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant yield reductions resulted in a number of trials, at yield levels above 1600 kg ha-l, from the use of wide row spacings”
t0“sorghum”
Claim · model-written summary
High population density reduced grain yield under severe water stress, especially with narrow spacing.
- Treatment
- high population densities (>150,000 plants ha-l)e0
- Outcome
- grain yieldse0
- Direction
- reducede0
- Qualifier
- severe water stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Where there was severe water stress, grain yields were also reduced by high population densities (>150,000 plants ha-l), particularly at the 0.33 or 0.36 m row spacing”
t0“sorghum”
Claim · model-written summary
Row-spacing response did not differ between cultivars.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no evidence that response to row spacing differed between cultivars”
t0“sorghum”
Claim · model-written summary
Root pruning had no effect on grain yield with ample moisture.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root pruning had no effect on grain yield under conditions of ample moisture supply”
t0“sorghum”
Claim · model-written summary
Root pruning reduced yield in wide-row sorghum under moisture stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield was reduced by root pruning of wide row sorghum (1.8 m spacing) under conditions of moisture stress”
The same questions in other papers
pruning · yield · SorghumPositive and negative results
12 papers in the same direction as this paper · 16 in the opposite direction
- positive
- positive
- positive
25 papers more in this group
See all 29 papers →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.