ABSTRACT Providing nutrients in optimum quantities is essential for increasing the productivity of timber species. Despite this, we know little about the actual potassium (K) requirements of native Amazonian Forest species. This study aimed to determine the critical level of K deficiency and toxicity for the initial cultivation of cedar. We grew Cedrela fissilis seedlings in a nutrient solution under the effect of five concentrations of K (0, 1, 2, 5, and 8 mmol L -1 ) in a completely randomized design with five replications. After 30 days, we evaluated the relative growth rate, dry mass production, proline content, symptomatology, macro and micronutrient content and accumulation, and K absorption and utilization efficiencies. Concentrations of K positively influence the growth, accumulation, and content of nutrients in the dry mass of the aerial part of young cedar plants. Providing varying amounts of potassium significantly affects the nutritional and growth parameters of Cedrela fissilis seedlings. Potassium doses of 3.5 - 4.00 mmol L -1 in the growing substrate led to better nutritional status (26.08 - 27.28 g kg -1 of K) and plant growth.

Nonato Junior Ribeiro dos Santos

José Zilton Lopes Santos

Sulianne Idalior Paião Rosado

Tainah Manuela Benlolo Brabosa

Mylena Rêgo Panza

Marcelo Tavares Nunes

Josinaldo Lopes Araújo Rocha

Revista Brasileira de Ciência do Solo

REVISTA BRASILEIRA DE CIÊNCIA DO SOLO 是一份科学期刊，由成立于 1947 年的巴西土壤科学学会 (SBCS) 出版，负责传播与土壤科学相关的原创和未经编辑的技术科学工作。投稿之前不得发表或提交给其他期刊，唯一的例外是在专业会议上以摘要形式提出的文章。经编辑委员会要求，接受文献评论。

The Revista Brasileira de Ciencia do Solo is a scientific journal published by the Brazilian Society of Soil Science (SBCS), which was established in 1947. The journal aims to disseminate original and unedited technical scientific work related to soil science. Submissions must not have been published or submitted to other journals, with the only exception being articles presented in abstract form at professional meetings. Literature reviews are accepted upon the request of the editorial board.

《Revista Brasileira de Ciencia do Solo》是一本科学期刊，由成立于1947年的巴西土壤科学学会（SBCS）出版，旨在传播与土壤科学相关的原创和未经编辑的技术科学研究成果。投稿的作品必须是未曾发表或提交给其他期刊的，唯一的例外是以摘要形式在专业会议上提出的文章。经编辑委员会的要求，文献评论也会被接受。

Category	Quartile
农林科学	4
农林科学, 土壤科学	4

Critical potassium concentrations for the initial cultivation of Cedrela fissilis Vell

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Journal Info

Category	Quartile
SOIL SCIENCE	3