Data/hora: 22/06/2024 08:46:58

Biblioteca(s): 	Embrapa Arroz e Feijão.	
Data corrente: 	25/02/2008	
Data da última atualização: 	02/06/2022	
Autoria: 	FAGERIA, N. K.; SANTOS, A. B. dos.	
Afiliação: 	NAND KUMAR FAGERIA, CNPAF; ALBERTO BAETA DOS SANTOS, CNPAF.	
Título: 	Lowland rice response to thermophosphate fertilization.	
Ano de publicação: 	2008	
Fonte/Imprenta: 	Communications in Soil Science and Plant Analysis, v. 39, n. 5/6, p. 873-889, Mar. 2008.	
DOI: 	https://doi.org/10.1080/00103620701881071	
Idioma: 	Inglês	
Conteúdo: 	The objective of this study was to evaluate response of lowland rice to added thermophosphate and to calibrate P soil testing for making P fertilizer recommendations. A field experiment was conducted for two consecutive years in central Brazil on a Haplaquept Inceptisol. The broadcast P rates used were 0, 131, 262, 393, 524, and 655 kg P ha-1, applied as thermophosphate Yoorin. Rice yield and yield components were significantly increased with the application of P fertilizer. Average maximum grain yield was obtained with the application of 509 kg P ha-1. Uptake of macro- and micronutrients had significant quadratic responses with increasing P rates. Application of thermophosphate significantly decreased soil acidity and created favorable macro- and micronutrient environment for lowland rice growth. Across 2 years, soil-test levels of Mehlich 1-extractable P were categorized, based on relative grain yield, as very low (0-17 mg P kg-1 soil), low (17-32 mg P kg-1 soil), medium (32-45 mg P kg-1 soil), or high (>45 mg P kg-1 soil). Similarly, soil-test levels of Bray 1-extractable P across 2 years were very low (0-17 mg P kg-1 soil), low (17-28 mg P kg-1 soil), medium (28-35 mg P kg-1 soil), or high (>35 mg P kg-1 soil). Soil P availability indices for Mehlich 1 extractant were slightly higher at higher P rates. However, both the extracting solutions had highly significant association with grain yield.	
Palavras-Chave: 	Fertilização; Soil acidity.	
Thesagro: 	Acidez do Solo; Arroz; Fósforo; Nutriente; Oryza Sativa.	
Thesaurus Nal: 	rice.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CNPAF - (26516-1) - UPC - AP - DD - 2008 -  - 2008 - DIS