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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Sugarcane straw preservation results in limited immobilization and improves crop N-fertilizer recovery

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Quassi de Castro, Saulo Augusto [1] ; Otto, Rafael [1] ; Bohorquez Sanchez, Camilo Ernesto [1] ; Tenelli, Sarah [1, 2] ; Sermarini, Renata Alcarde [1] ; Ocheuze Trivelin, Paulo Cesar [3]
Total Authors: 6
[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil
[2] Brazilian Ctr Energy & Mat Res CNPEM, Brazilian Biorenewables Natl Lab LNBR, Av Giuseppe Maximo Scolfaro 10000, BR-13083100 Campinas, SP - Brazil
[3] Univ Sao Paulo, Ctr Nucl Energy Agr, Av Centenario 303, BR-13416000 Piracicaba, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: BIOMASS & BIOENERGY; v. 144, JAN 2021.
Web of Science Citations: 0

Current knowledge indicates that sugarcane straw is a short-term sink of fertilizer nitrogen (N) due to N immobilization during the decomposition process. This study aimed to determine whether sugarcane straw removal from the field benefits the N-fertilizer recovery by plant (NRP), and if legume cultivation will further improve NRP. Half of a field was planted with sunn hemp (Crotalaria spectabilis) and half was left fallow. In the second ratoon, treatments with 0, 50, and 100% of sugarcane straw maintenance levels were installed, receiving 120 kg ha(-1) N over straw. A microplot of ammonium nitrate labeled with 1.99% atoms N-15 was included. NRP was quantified at 92, 164, and 264 days after fertilization (DAF). At harvest (264 DAF), soil samples and straw ( 4 mm and 4 mm fractions) were collected to determine N-fertilizer recovery in the soil (NRS) and in the straw (NRSt). Maintaining 50 and 100% of straw improved NRP over the sugarcane cycle. NRP was not improved by crop rotation cultivation and NRS averaged 50% in the entire soil profile. NRSt at harvest averaged 1-3% in the 50% and 100% straw levels. Contrary to the current view, N-fertilizer immobilization in the straw was negligible and keeping straw could improve NRP. The findings indicate that increasing N rates in green cane trash blanket system to compensate for the N-fertilizer immobilization is not necessary, and that straw removal for bioenergy production will change the short-term demand for N-fertilizer. (AU)

FAPESP's process: 15/25151-7 - Nitrogen fertilizer in sugarcane due to crop rotation, straw removal and nitrogen rates
Grantee:Saulo Augusto Quassi de Castro
Support type: Scholarships in Brazil - Master
FAPESP's process: 14/05591-0 - Effect of Crotalaria rotation and trash removal in soil N transformations and sugarcane response to N fertilization
Grantee:Rafael Otto
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants