Abstract
Sugarcane is regarded as a luxury accumulator of potassium (K). Soil testing at plough-out of older ratoons prior to establishing grain-legume crops (soybean and peanuts) sometimes highlights low soil reserves of the element. Agronomists have been seeking guidance on fertilization strategies to maximize break-crop grain yields in sugarcane soils that have depleted K levels. A replicated field trial was established to determine the effect of a range of K fertilizer additions on the productivity of a soybean and then a peanut crop in a long fallow from sugarcane. The residual value of the K supplied in the legume phase was also assessed in the subsequent sugarcane crop. Despite the additions of K from 0 to 250 kg K/ha in 50 kg increments there was no productivity response in either legume crop. The subsequent plant-cane crop (Q208A) also demonstrated no productivity response to K fertilizer that was applied to the soil prior to the establishment of the soybean crop. Analysis of plant-cane K concentrations showed no difference in K returned to the site as trash. However, there were significant differences in the quantities of K exported off-farm in millable stalk. The lack of fertilizer K responses, despite low soil-test K concentrations at the end of the sugarcane crop cycle, suggest considerable uncertainty in the interpretation of current soil-testing strategies remains. However, it is unsustainable to mine soil nutrients. Growers have two options; either to supply enough K to meet expected legume crop removal or alternatively recognize that if K is over-supplied to the legume phase, then there is the opportunity to ‘discount’ that in the plant-cane fertilization strategy. © 2019 Australian Society of Sugar Cane Technologists. All rights reserved.
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Claims 7
Claim · model-written summary
Potassium fertilizer additions from 0 to 250 kg K/ha had no productivity response in soybean.
- Taxon
- soybean
Glycine maxe0 - Treatment
- additions of K from 0 to 250 kg K/ha in 50 kg incrementse1
- Outcome
- productivitye1
- Direction
- no productivity responsee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effect of a range of K fertilizer additions on the productivity of a soybean and then a peanut crop”
e1“Despite the additions of K from 0 to 250 kg K/ha in 50 kg increments there was no productivity response in either legume crop”
Claim · model-written summary
Potassium fertilizer additions from 0 to 250 kg K/ha had no productivity response in peanut.
- Taxon
- peanut
Arachis hypogaeae0 - Treatment
- additions of K from 0 to 250 kg K/ha in 50 kg incrementse1
- Outcome
- productivitye1
- Direction
- no productivity responsee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effect of a range of K fertilizer additions on the productivity of a soybean and then a peanut crop”
e1“Despite the additions of K from 0 to 250 kg K/ha in 50 kg increments there was no productivity response in either legume crop”
Claim · model-written summary
K fertilizer applied before the soybean crop gave no productivity response in the subsequent plant-cane sugarcane crop (Q208A).
- Taxon
- Sugarcanee3
- Material
- Q208Ae2
- Treatment
- K fertilizer that was applied to the soil prior to the establishment of the soybean crope2
- Outcome
- productivitye2
- Direction
- no productivity responsee2
Not reportedComparator
Verbatim
e2“The subsequent plant-cane crop (Q208A) also demonstrated no productivity response to K fertilizer that was applied to the soil prior to the establishment of the soybean crop”
e3“Sugarcane is regarded as a luxury accumulator of potassium (K)”
Claim · model-written summary
Plant-cane K concentrations showed no difference in K returned to the site as trash.
Verbatim
e3“Sugarcane is regarded as a luxury accumulator of potassium (K)”
e4“Analysis of plant-cane K concentrations showed no difference in K returned to the site as trash”
Claim · model-written summary
There were significant differences in quantities of K exported off-farm in millable stalk of sugarcane.
Verbatim
e3“Sugarcane is regarded as a luxury accumulator of potassium (K)”
e5“there were significant differences in the quantities of K exported off-farm in millable stalk”
Claim · model-written summary
Growers could supply enough K to meet expected legume crop removal.
Verbatim
e3“Sugarcane is regarded as a luxury accumulator of potassium (K)”
e6“Growers have two options; either to supply enough K to meet expected legume crop removal or alternatively recognize that if K is over-supplied to the legume phase, then there is the opportunity to ‘discount’ that in the plant-cane fertilization strategy”
Claim · model-written summary
Growers could discount K over-supplied to the legume phase in the plant-cane fertilization strategy.
Verbatim
e3“Sugarcane is regarded as a luxury accumulator of potassium (K)”
e6“Growers have two options; either to supply enough K to meet expected legume crop removal or alternatively recognize that if K is over-supplied to the legume phase, then there is the opportunity to ‘discount’ that in the plant-cane fertilization strategy”
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