Abstract
The use of sewage sludge in Brazilian agriculture was regulated by the resolution no. 375 Conama, in 2006. However, there is a lack of research to adequate the mineral N and P fertilizer doses to be applied in agricultural fields treated with this residue. In a field experiment, the effects of application rates of sewage sludge and mineral N and P fertilizers on the productivity and technical characteristics of the cane-plant and first ratoon (residual effect) crops were evaluated. Four doses of sewage sludge (0, 3.6, 7.2 and 10.8 t ha-1, dry base), of N (0, 30, 60 and 90 kg ha-1) and of P2O5 (0, 60, 120 and 180 kg ha-1) were combined in a factorial and laid out on randomized block design, a with two replications. To evaluate the residual effect of the sludge, 120 kg ha-1 N and 140 kg ha-1 of K2O were applied in all plots. Sludge application at cane planting, with or without N and/or P fertilizer increased the stalk yield from 84 up to 118 t ha-1, with no alteration in the sugarcane quality, compared with the application of NPK fertilizer alone, resulting in a stalk yield of 91 t ha-1. The study of the response surface for stalk yield on lowfertility soil was the basis for a recommendation of mineral N and P fertilizer doses for sugarcane implantation as related to sewage sludge application rates. It was also concluded that a sludge application of 10.8 t ha-1, which is the sludge dose established based on the N criterion according to the resolution Conama nº 375, could a) reduce the use of mineral N by 100 % and of P2O5 by 30 %, with increments of 22 % in stalk yield, as a direct effect of sludge application to cane plant crop, and b) increase the stalk yield in the second harvest (first ratoon) by up to 12 % and sugar yield by up to 11 %, by the residual effect of sludge application to sugar cane.
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Claims 7
Claim · model-written summary
Sewage sludge application at planting increased sugarcane stalk yield from 84 to 118 t ha-1 compared with NPK fertilizer alone at 91 t ha-1.
Verbatim
e0“Sludge application at cane planting, with or without N and/or P fertilizer increased the stalk yield from 84 up to 118 t ha-1, with no alteration in the sugarcane quality, compared with the application of NPK fertilizer alone, resulting in a stalk yield of 91 t ha-1”
t0“sugarcane quality”
Claim · model-written summary
Sewage sludge application at planting did not alter sugarcane quality compared with NPK fertilizer alone.
Verbatim
e0“Sludge application at cane planting, with or without N and/or P fertilizer increased the stalk yield from 84 up to 118 t ha-1, with no alteration in the sugarcane quality, compared with the application of NPK fertilizer alone”
t0“sugarcane quality”
Claim · model-written summary
A 10.8 t ha-1 sewage sludge application could reduce mineral nitrogen use by 100%.
- Taxon
- sugarcanet0
- Treatment
- sludge application of 10.8 t ha-1e0
- Outcome
- use of mineral Ne0
- Direction
- reducee0
- Value
- 100 %e0
Not reportedComparator
Verbatim
e0“a sludge application of 10.8 t ha-1, which is the sludge dose established based on the N criterion according to the resolution Conama nº 375, could a) reduce the use of mineral N by 100 %”
t0“sugarcane quality”
Claim · model-written summary
A 10.8 t ha-1 sewage sludge application could reduce P2O5 use by 30%.
- Taxon
- sugarcanet0
- Treatment
- sludge application of 10.8 t ha-1e0
- Outcome
- P2O5e0
- Direction
- reducee0
- Value
- 30 %e0
Not reportedComparator
Verbatim
e0“a sludge application of 10.8 t ha-1, which is the sludge dose established based on the N criterion according to the resolution Conama nº 375, could a) reduce the use of mineral N by 100 % and of P2O5 by 30 %”
t0“sugarcane quality”
Claim · model-written summary
A 10.8 t ha-1 sewage sludge application increased cane-plant stalk yield by 22%.
- Taxon
- sugarcanet0
- Organ / stage
- cane plant crope0
- Treatment
- sludge application of 10.8 t ha-1e0
- Outcome
- stalk yielde0
- Direction
- incrementse0
- Value
- 22 %e0
Not reportedComparator
Verbatim
e0“a sludge application of 10.8 t ha-1, which is the sludge dose established based on the N criterion according to the resolution Conama nº 375, could a) reduce the use of mineral N by 100 % and of P2O5 by 30 %, with increments of 22 % in stalk yield, as a direct effect of sludge application to cane plant crop”
t0“sugarcane quality”
Claim · model-written summary
Residual effects of sewage sludge increased first ratoon stalk yield by up to 12%.
- Taxon
- sugar canee0
- Organ / stage
- first ratoone0
- Treatment
- residual effect of sludge applicatione0
- Outcome
- stalk yielde0
- Direction
- increasee0
- Value
- up to 12 %e0
Not reportedComparator
Verbatim
e0“increase the stalk yield in the second harvest (first ratoon) by up to 12 % and sugar yield by up to 11 %, by the residual effect of sludge application to sugar cane”
Claim · model-written summary
Residual effects of sewage sludge increased first ratoon sugar yield by up to 11%.
- Taxon
- sugar canee0
- Organ / stage
- first ratoone0
- Treatment
- residual effect of sludge applicatione0
- Outcome
- sugar yielde0
- Direction
- increasee0
- Value
- up to 11 %e0
Not reportedComparator
Verbatim
e0“increase the stalk yield in the second harvest (first ratoon) by up to 12 % and sugar yield by up to 11 %, by the residual effect of sludge application to sugar cane”
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