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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Co-addition of humic substances and humic acids with urea enhances foliar nitrogen use efficiency in sugarcane (Saccharum officinarum L.)

Texto completo
Autor(es):
Leite, Jose M. [1, 2] ; Arachchige, Pavithra S. Pitumpe [2] ; Ciampitti, Ignacio A. [2] ; Hettiarachchi, Ganga M. [2] ; Maurmann, Leila [3] ; Trivelin, Paulo C. O. [4] ; Prasad, P. V. Vara [2] ; Sunoj, S. V. John [2, 5, 6]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Dept Soil Sci, Piracicaba - Brazil
[2] Kansas State Univ, Dept Agron, Manhattan, KS 66506 - USA
[3] Kansas State Univ, Dept Chem, Manhattan, KS 66506 - USA
[4] Univ Sao Paulo, Lab Stable Isotopes, Piracicaba - Brazil
[5] Guangxi Univ, State Key Lab Conservat & Utilizat Subtrop Agrobi, Nanning, Guangxi - Peoples R China
[6] Guangxi Univ, Guangxi Key Lab Forest Ecol & Conservat, Nanning, Guangxi - Peoples R China
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Fonte: HELIYON; v. 6, n. 10 OCT 2020.
Citações Web of Science: 0
Resumo

Humic substances (HS) and humic acids (HA) are proven to enhance nutrient uptake and growth in plants. Foliar application of urea combined with HS and HA offers an alternative strategy to increase nitrogen use efficiency (NUE). The objective of this study was to understand the effects of foliar application of HA and HS along with urea on NUE and response of different biometric, biochemical and physiological traits of sugarcane with respect to cultivar, mode of foliar application, geographic location and intervals of foliar application. To study this, two different independent Experiments were conducted in green house facilities at two different agro-climatic zones (USA and Brazil) using two different predominant varieties, modes and intervals of foliar applications. The three different foliar applications used in this study were (1) urea (U), (2) mixture of urea and HS (U+HS) and (3) HA(U+HS). In both Experiments, N-15 (nitrogen isotope) recovery or NUE was higher in U+HS followed by U+HS. However, magnitude of NUE changed according to the differences in two Experiments. Results showed that foliar application of U+HS and U+HS was rapidly absorbed and stored in the form of protein and starch. Also induced changes in photosynthesis, intrinsic water use efficiency, protein, total soluble sugars and starch signifying a synergistic effect of U+HS and U+HS on carbon and nitrogen metabolism. These results showed promising use of HS and HA with urea to improve NUE in sugarcane compared to using the urea alone. Simultaneously, mode,quantity, and interval of foliar application should be standardized based on the geographic locations and varieties to optimize the NUE. (AU)

Processo FAPESP: 11/21532-5 - Eficiência agronômica da adubação nitrogenada associada à aplicação de ácido húmico em cana-de-açúcar
Beneficiário:José Marcos Leite
Linha de fomento: Bolsas no Brasil - Doutorado