Abstract
Reliable fertilizer recommendations should account for factors influencing nutrient supply, including non-exchangeable potassium (K) reserves and fixation capacity, to ensure optimum crop yields. The combined effects of non-exchangeable K reserves and fixation capacity of soils on crop response to K application has not been evaluated. This study evaluated the response of sugarcane yields to K application on two soils with contrasting combinations of non-exchangeable K reserves and fixation capacity. Potassium was applied at 0, 120, and 240 kg K ha−1 at the commencement of the field trials and after each harvest on an umbric Acrisol, which had low non-exchangeable K reserves and medium K fixation capacity, and a cutanic Acrisol, which had ‘very high’ non-exchangeable K reserves and fixation capacity. Sugarcane stalk and sucrose yield, leaf, and exchangeable K were measured for each season. In the umbric Acrisol, a lower sucrose yield was measured in the 240 kg K ha−1 treatment compared to the control for the plant crop, but this application rate had higher yields for the second ratoon. In contrast, there was no yield response to K application in cutanic Acrisol. This study indicated the importance of non-exchangeable K reserves and fixation capacity when calculating K requirements and conducting field calibration studies.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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 4
Claim · model-written summary
In the umbric Acrisol, 240 kg K ha−1 lowered sucrose yield relative to the control in the plant crop.
Verbatim
e1“response of sugarcane yields to K application”
e2“a lower sucrose yield was measured in the 240 kg K ha−1 treatment compared to the control for the plant crop”
e3“on an umbric Acrisol”
Claim · model-written summary
In the umbric Acrisol, 240 kg K ha−1 gave higher yields in the second ratoon.
- Taxon
- sugarcanee1
- Treatment
- this application ratee2
- Outcome
- yieldse2
- Direction
- highere2
- Qualifier
- second ratoone2
- Setting
- umbric Acrisole3
Not reportedComparator
Verbatim
e1“response of sugarcane yields to K application”
e2“but this application rate had higher yields for the second ratoon”
e3“on an umbric Acrisol”
Claim · model-written summary
In the cutanic Acrisol, K application had no effect on sugarcane yield.
- Taxon
- sugarcanee1
- Treatment
- K applicatione4
- Outcome
- yielde4
- Direction
- no_changeinferrede4
- Setting
- cutanic Acrisole4
Not reportedComparator
Verbatim
e1“response of sugarcane yields to K application”
e4“there was no yield response to K application in cutanic Acrisol”
Claim · model-written summary
The study indicates that non-exchangeable K reserves and fixation capacity matter when calculating K requirements for sugarcane.
Verbatim
e1“response of sugarcane yields to K application”
e5“non-exchangeable K reserves and fixation capacity when calculating K requirements”
The same questions in other papers
potassium · yield · Saccharum officinarum (sugarcane)Results differ
6 papers in the same direction as this paper · 50 in the opposite direction
- positive
- positive
- positive
53 papers more in this group
See all 57 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.