Abstract
5 fertilizer trials were carried out in 1974-5 at 3 different high-alt. locations in Kenya. In 3 of the 5 trials the yield response of a grain-type sorghum cv. was compared with the response of a forage-type cv. to N and P. In the other 2 trials the yield response of a grain-type sorghum to N, P, K and Mg + Zn, B and Cu was studied. Rainfall during the field period of the crop varied from 225 mm to 811 mm. There was no interaction with yr, but the responses varied greatly with trial site. Although DM yields obtained from the grain type in the driest trials were considered good (4.9 t DM/ha on 255 mm and 7.2 t DM/ha on 294 mm), no response to N or P was observed. Under wetter conditions it appeared that N increased the total DM yield of the forage-type cv. and the grain yield of the grain-type cv.; the type was accentuated. P increased the grain yield and total DM yield of the grain-type cv. Both N and P increased the CP content of the forage sorghum, but with the grain sorghum only N increased CP content whereas P decreased it. K and trace elements had a positive influence on yield in 2 experiments, but more work is needed to evaluate this effect in detail. Yield and forage quality differences resulting from different fertilizer applications were small. One possible reason for this is N-fixation in the soil, but more research is needed to substantiate this. In the trials with the lowest rainfall, the earlier maturing grain type outyielded the forage type, but if rainfall was less limited the forage type had a clear advantage over the grain type. (Abstract retrieved from CAB Abstracts by CABI’s permission)
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 18
Claim · model-written summary
Yield responses varied greatly among trial sites, with no year interaction.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no interaction with yr, but the responses varied greatly with trial site”
t0“sorghums”
Claim · model-written summary
Grain type dry matter yield reached 4.9 t DM/ha at 255 mm rainfall.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DM yields obtained from the grain type in the driest trials were considered good (4.9 t DM/ha on 255 mm and 7.2 t DM/ha on 294 mm)”
t0“sorghums”
Claim · model-written summary
Grain type dry matter yield reached 7.2 t DM/ha at 294 mm rainfall.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DM yields obtained from the grain type in the driest trials were considered good (4.9 t DM/ha on 255 mm and 7.2 t DM/ha on 294 mm)”
t0“sorghums”
Claim · model-written summary
N produced no yield response in the driest trials.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the driest trials were considered good (4.9 t DM/ha on 255 mm and 7.2 t DM/ha on 294 mm), no response to N or P was observed”
t0“sorghums”
Claim · model-written summary
P produced no yield response in the driest trials.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the driest trials were considered good (4.9 t DM/ha on 255 mm and 7.2 t DM/ha on 294 mm), no response to N or P was observed”
t0“sorghums”
Claim · model-written summary
Under wetter conditions N appeared to increase forage type total dry matter yield.
- Material
- forage-type cv.e0
- Treatment
- Ne0
- Outcome
- total DM yielde0
- Direction
- increasede0
- Qualifier
- Under wetter conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under wetter conditions it appeared that N increased the total DM yield of the forage-type cv.”
t0“sorghums”
Claim · model-written summary
Under wetter conditions N appeared to increase grain type grain yield.
- Material
- grain-type cv.e0
- Treatment
- Ne0
- Outcome
- grain yielde0
- Direction
- increasede0
- Qualifier
- Under wetter conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under wetter conditions it appeared that N increased the total DM yield of the forage-type cv. and the grain yield of the grain-type cv.”
t0“sorghums”
Claim · model-written summary
P increased grain yield of the grain type cultivar.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P increased the grain yield and total DM yield of the grain-type cv.”
t0“sorghums”
Claim · model-written summary
P increased total dry matter yield of the grain type cultivar.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P increased the grain yield and total DM yield of the grain-type cv.”
t0“sorghums”
Claim · model-written summary
N increased crude protein content of forage sorghum.
Not reportedComparator
Verbatim
e0“Both N and P increased the CP content of the forage sorghum”
Claim · model-written summary
P increased crude protein content of forage sorghum.
Not reportedComparator
Verbatim
e0“Both N and P increased the CP content of the forage sorghum”
Claim · model-written summary
N increased crude protein content of grain sorghum.
- Taxon
- grain sorghum
Sorghum bicolore0 - Treatment
- Ne0
- Outcome
- CP contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with the grain sorghum only N increased CP content whereas P decreased it”
Claim · model-written summary
P decreased crude protein content of grain sorghum.
- Taxon
- grain sorghumSorghum bicolore0
- Treatment
- Pe0
- Outcome
- CP contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with the grain sorghum only N increased CP content whereas P decreased it”
Claim · model-written summary
K positively influenced yield in two experiments.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K and trace elements had a positive influence on yield in 2 experiments”
t0“sorghums”
Claim · model-written summary
Trace elements positively influenced yield in two experiments.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K and trace elements had a positive influence on yield in 2 experiments”
t0“sorghums”
Claim · model-written summary
Fertilizer applications yielded small differences in yield and forage quality.
- Treatment
- different fertilizer applicationse0
- Outcome
- Yield and forage quality differencese0
- Direction
- smalle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield and forage quality differences resulting from different fertilizer applications were small”
t0“sorghums”
Claim · model-written summary
In the lowest rainfall trials grain type sorghum outyielded forage type.
- Material
- grain typee0
- Outcome
- outyieldede0
- Direction
- outyieldede0
- Qualifier
- lowest rainfalle0
- Comparator
- forage typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the trials with the lowest rainfall, the earlier maturing grain type outyielded the forage type”
t0“sorghums”
Claim · model-written summary
With less limited rainfall forage type had a clear yield advantage over grain type.
- Material
- forage typee0
- Outcome
- clear advantagee0
- Direction
- clear advantagee0
- Qualifier
- rainfall was less limitede0
- Comparator
- grain typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“if rainfall was less limited the forage type had a clear advantage over the grain type”
t0“sorghums”
The same questions in other papers
potassium · yield · SorghumResults differ
23 papers in the same direction as this paper · 16 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- no effect
37 papers more in this group
See all 41 papers →phosphorus · yield · SorghumResults differ
91 papers in the same direction as this paper · 12 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- no effect
101 papers more in this group
See all 105 papers →phosphorus · molecular: metabolites · Sorghum bicolor (sorghum)Positive and negative results
1 in the opposite direction
- positive
phosphorus · molecular: metabolites · SorghumPositive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
4 papers more in this group
See all 8 papers →nitrogen · molecular: metabolites · SorghumPositive and negative results
16 papers in the same direction as this paper · 6 in the opposite direction
- no effect
- negative
- negative
19 papers more in this group
See all 23 papers →nitrogen · yield · SorghumPositive and negative results
263 papers in the same direction as this paper · 22 in the opposite direction · 4 reporting no difference from an alternative
- negative
- negative
- negative
286 papers more in this group
See all 290 papers →nitrogen · molecular: metabolites · Sorghum bicolor (sorghum)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.