Data/hora: 05/06/2024 15:59:40

Biblioteca(s): 	Embrapa Acre; Embrapa Agrobiologia; Embrapa Agropecuária Oeste; Embrapa Algodão; Embrapa Amapá; Embrapa Amazônia Ocidental; Embrapa Amazônia Oriental; Embrapa Arroz e Feijão; Embrapa Clima Temperado; Embrapa Gado de Leite; Embrapa Hortaliças; Embrapa Instrumentação; Embrapa Meio Ambiente; Embrapa Meio Norte / UEP-Parnaíba; Embrapa Meio-Norte; Embrapa Milho e Sorgo; Embrapa Pantanal; Embrapa Rondônia; Embrapa Roraima; Embrapa Semiárido; Embrapa Soja; Embrapa Solos; Embrapa Tabuleiros Costeiros; Embrapa Uva e Vinho.	
Data corrente: 	16/07/1992	
Data da última atualização: 	26/03/2015	
Autoria: 	RAIJ, B. van.	
Título: 	Gesso agricola na melhoria do ambiente radicular no subsolo.	
Ano de publicação: 	1988	
Fonte/Imprenta: 	São Paulo: Associação Nacional para Difusao de Adubos e Corretivos Agrícolas, 1988.	
Páginas: 	88 p.	
Idioma: 	Português	
Conteúdo: 	This is a review on the use of gypsum as a subsoil ameliorator. Gypsum is a byproduct of the phosphoric acid production that is being recommended as subsoil amendment, aiming to improve deep rooting of crops. However, there is still controversy about its use for this purpose. Large areas of brazilian soils have acid subsoils, with low calcium and high aluminum contents, conditions that constitute chemical bariers for root penetration. The harmful effect of aluminm on root development is well known. Furthermore, the presence of calcium in the root envrironment is essential since this element is not translocated from upper to other parts of the plants. Gypsum, or calcium sulfate, is a soluble salt that, unlike limestone, penetrtes into the subsoil. The most direct effect is an increase in calcium, which provides a decrease of aluminum saturation by a dilution effect. However, several papers report an effect of gypsum in reducing exchangeable aluminum. Possible rasons for this are discussed. Studies in soil solutions and nutrient solutions containing aluminum have shown that aluminum activities present negative relations with root development. On the other hand, gypsum reduces aluminum activity and as such improves root development. Field trials have shown the effect of surface applied gypsum in deepening the roots of cultivated plants in acid subsoils. In some cases this leads to water and nitrate uptake from deeper soil layers. There are also reports of gypsum improving physical properties of acid subsoils. Several experiments show positive effects of gypsum in the increase of yields. However, in some cases a possible effect of sulphur as a nutrient makes it impossible to isolate the effect of gypsum as a subsoil amendment. There are still no criteria available for when and how much gypsum to apply on acid soils. Care should be taken to avoid leaching losses of magnesium and potassium.	
Palavras-Chave: 	Adubacao mineral; Agrícola; Ambiente radicular; ANDA; Chemical; Chemistry propriety; Composição; Correcao; Correção de solos; Corretivos agrícolas; Fertilizantes; Fertilization; Gesso agricola; Improvement; Melhoria; Mineral fertilization; Plant; Propriedade quimica; Propriedades quimicas; Relacao; Relation; Root; Rooting amelioration; Soil physicochemical properties; Solos; Solos ácidos; Subsoils; Substrate; Uso; Uso na agricultura; Vegetal nutrition.	
Thesagro: 	Acidez; Adsorção; Adubação; Adubo; Agricultura; Gesso; Íon; Lixiviação; Melhoramento; Nitrogênio; Nutrição Vegetal; Pesquisa; Planta; Química; Raiz; Sistema Radicular; Solo; Subsolo.	
Thesaurus Nal: 	acidity; agriculture; gypsum; nutrition; soil.	
Categoria do assunto: 	--
P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Roraima (CPAF-RR)	
Exemplares: 	CNPDIA - (9464-1) - ADD - LV - -- - 631.81 - R149g - 2006.00054 - DIS
CPAMN-UEPP - (5473-1) - ADD - LV - PP - 631.81 - R149g - LV469/1988 - DIS
CPATSA - (19664-1) - ADD - LV - PP - 631.821 - R149g - 1988.00361 - DIS
CNPAF - (20673-1) - ADD - LV - -- - 631.821 - R149g - 1990.00082 - DIS
CPAO - (25679-1) - ADD - LV - -- - 631.821 - R149g - 88.00232 - DIS
CNPA - (4432-1) - ADD - LV - -- - 631.81 - R149g - 1993.5074 - DIS
CNPS - (1800-1) - ADD - LV - PP - 631.81 - R149g - 1994.01500 - DIS
CPAF-AP - (3046-1) - ADD - LV - PP - 631.81 - R149g - 1989.00005 - DIS
CPATC - (8800-1) - ADC - LV - PP - 631.81 - R149g - 1988.00246 - DIS
CPATU - (16350-1) - ADD - LV - -- - 631.821 - R149g - 1990.00012 - DIS
CNPSO - (5026-1) - ADD - LV - -- - 631.8 - R152g - 1989.00107 - DIS
CNPMS - (3410-1) - ADD - LV - PP - 631.81 - R149g - 1988.00285 - DIS
CPAF-AC - (1886-1) - ADD - LV - PP - 631.81 - R149g - 1999.01063 - DIS
CNPUV - (2140-1) - ADD - LV - -- - 631.81 - R149g - 1993.02709 - DIS
CNPGL - (7349-1) - ADD - LV - -- - 631.821 - R149g - 1990.00055 - DIS
CNPAB - (34047-1) - ADD - LV - -- - 1988.0057 -  - 1988.00057 - DIS
CPAA - (19074-1) - ADD - LV - -- - 631.81 - R149g - 2008.00029 - DIS
CPAF-RR - (3851-1) - EMB - LV - -- - 631.42 - R149g - 2000.00725 - DIS
CPAF-RO - (12183-1) - ADD - LV - -- - 631.81 - R149g - 226.88 - DIS
CPACT - (1259-1) - ADD - LV - -- - 631.81 - R274g - 1989.00837 - DIS
CNPH - (10731-1) - ADD - LV - -- - 631.821 - R149g - 1988.567 - DIS
CPAP - (45760-1) - ADD - LV - -- - 631.81 - R151g - 1988.00314 - DIS
CPAMN - (27650-1) - ADD - LV - PP - 631.4 - R149g - 1990.00366 - DIS
CNPMA - (11420-1) - ADD - LV - PP - 631.81 - R149g - 1990.00010 - DIS