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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.)

Silicon Amendment Enhances Agronomic Efficiency of Nitrogen Fertilization in Maize and Wheat Crops under Tropical Conditions

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Galindo, Fernando Shintate [1] ; Pagliari, Paulo Humberto [2] ; Rodrigues, Willian Lima [3] ; Fernandes, Guilherme Carlos [3] ; Boleta, Eduardo Henrique Marcandalli [3] ; Santini, Jose Mateus Kondo [3] ; Jalal, Arshad [3] ; Buzetti, Salatier [3] ; Lavres, Jose [3] ; Teixeira Filho, Marcelo Carvalho Minhoto [3]
Total Authors: 10
[1] Univ Sao Paulo, Ctr Nucl Energy CENA, BR-13416000 Piracicaba - Brazil
[2] Univ Minnesota UMN, Dept Soil Water & Climate, Southwest Res & Outreach SWROC, Lamberton, MN 56152 - USA
[3] Sao Paulo State Univ UNESP, Dept Plant Hlth Rural Engn & Soils DEFERS, BR-15345000 Ilha Solteira - Brazil
Total Affiliations: 3
Document type: Journal article
Source: PLANTS-BASEL; v. 10, n. 7 JUL 2021.
Web of Science Citations: 0

Sustainable management strategies are needed to improve agronomic efficiency and cereal yield production under harsh abiotic climatic conditions such as in tropical Savannah. Under these environments, field-grown crops are usually exposed to drought and high temperature conditions. Silicon (Si) application could be a useful and sustainable strategy to enhance agronomic N use efficiency, leading to better cereal development. This study was developed to explore the effect of Si application as a soil amendment source (Ca and Mg silicate) associated with N levels applied in a side-dressing (control, low, medium and high N levels) on maize and wheat development, N uptake, agronomic efficiency and grain yield. The field experiments were carried out during four cropping seasons, using two soil amendment sources (Ca and Mg silicate and dolomitic limestone) and four N levels (0, 50, 100 and 200 kg N ha(-1)). The following evaluations were performed in maize and wheat crops: the shoots and roots biomass, total N, N-NO3-, N-NH4+ and Si accumulation in the shoots, roots and grain tissue, leaf chlorophyll index, grain yield and agronomic efficiency. The silicon amendment application enhanced leaf chlorophyll index, agronomic efficiency and N-uptake in maize and wheat plants, benefiting shoots and roots development and leading to a higher grain yield (an increase of 5.2 and 7.6%, respectively). It would be possible to reduce N fertilization in maize from 185-180 to 100 kg N ha(-1) while maintaining similar grain yield with Si application. Additionally, Si application would reduce N fertilization in wheat from 195-200 to 100 kg N ha(-1). Silicon application could be a key technology for improving plant-soil N-management, especially in Si accumulator crops, leading to a more sustainable cereal production under tropical conditions. (AU)

FAPESP's process: 17/06002-6 - Inoculation with Azospirillum brasilense associated with the use of silicon and nitrogen doses in corn and wheat crops
Grantee:Fernando Shintate Galindo
Support type: Scholarships in Brazil - Doctorate