Abstract
The K is important for sugar concentration in sugarcane, but the salt effect on K fertilizer may reduce the productivity. The objective of this study was to evaluate productivity of sugarcane, to establish soil and plant K critical levels, and to determine a saline limit of the soil with maximum agronomic efficiency. The sugarcane variety RB992506 was cultivated in the field in Oxisol (Kandic) dystrophic with very sandy and low K content, mainly in subsurface. Six doses of K2O were used: 0; 25; 50; 100; 200; 250 kg ha-1. We evaluated soil and leaf K content, electrical conductivity of the saturated soil paste, productivity and technological quality of the sugarcane. The application of K promoted increase in soil and leaf K levels, increasing also both productivity and the sugar concentration. The dose of maximum agronomic efficiency was 150 kg ha-1 of K2O and production of 116 Mg ha-1. High doses of K (> 200 kg ha-1 of K2O) decreased the productivity due to elevated soil salinity by the application of K fertilizer. The critical levels of K were 0.18 cmolc dm-3 in the soil and 9.53 g kg-1 in the plant and were associated with low doses of K (< 25 kg ha-1 of K2O). The salinity limits that reduced productivity were 1.38 dS m-1 in the surface layer and 1.19 dS m-1 in the subsurface, suggesting that these critical levels and limits can be used to evaluate the fertility of sandy soils cultivated with sugarcane in tropical regions.
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Claims 10
Claim · model-written summary
K application increased soil and leaf K levels.
Not reportedComparator
Verbatim
e0“The application of K promoted increase in soil and leaf K levels”
t0“sugarcane”
Claim · model-written summary
K application increased productivity.
Not reportedComparator
Verbatim
e0“The application of K promoted increase in soil and leaf K levels, increasing also both productivity and the sugar concentration.”
t0“sugarcane”
Claim · model-written summary
K application increased sugar concentration.
Not reportedComparator
Verbatim
e0“The application of K promoted increase in soil and leaf K levels, increasing also both productivity and the sugar concentration.”
t0“sugarcane”
Claim · model-written summary
Maximum agronomic efficiency occurred at 150 kg ha-1 K2O and 116 Mg ha-1 production.
Verbatim
e0“The dose of maximum agronomic efficiency was 150 kg ha-1 of K2O and production of 116 Mg ha-1.”
t0“sugarcane”
Claim · model-written summary
K doses above 200 kg ha-1 decreased productivity through soil salinity.
- Taxon
- sugarcanet0
- Treatment
- High doses of K (> 200 kg ha-1 of K2O)e0
- Outcome
- productivitye0
- Direction
- decreasede0
- Qualifier
- elevated soil salinitye0
Not reportedComparator
Verbatim
e0“High doses of K (> 200 kg ha-1 of K2O) decreased the productivity due to elevated soil salinity by the application of K fertilizer.”
t0“sugarcane”
Claim · model-written summary
The soil K critical level was 0.18 cmolc dm-3.
Verbatim
e0“The critical levels of K were 0.18 cmolc dm-3 in the soil and 9.53 g kg-1 in the plant and were associated with low doses of K (< 25 kg ha-1 of K2O).”
t0“sugarcane”
Claim · model-written summary
The plant K critical level was 9.53 g kg-1.
Verbatim
e0“The critical levels of K were 0.18 cmolc dm-3 in the soil and 9.53 g kg-1 in the plant and were associated with low doses of K (< 25 kg ha-1 of K2O).”
t0“sugarcane”
Claim · model-written summary
Surface salinity at 1.38 dS m-1 reduced productivity.
Verbatim
e0“The salinity limits that reduced productivity were 1.38 dS m-1 in the surface layer and 1.19 dS m-1 in the subsurface”
t0“sugarcane”
Claim · model-written summary
Subsurface salinity at 1.19 dS m-1 reduced productivity.
Verbatim
e0“The salinity limits that reduced productivity were 1.38 dS m-1 in the surface layer and 1.19 dS m-1 in the subsurface”
t0“sugarcane”
Claim · model-written summary
The authors suggest the critical levels and salinity limits for assessing sandy soil fertility.
Verbatim
e0“suggesting that these critical levels and limits can be used to evaluate the fertility of sandy soils cultivated with sugarcane in tropical regions.”
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