Data/hora: 23/06/2024 18:01:30

Biblioteca(s): 	Embrapa Trigo.	
Data corrente: 	10/01/2010	
Data da última atualização: 	16/08/2011	
Autoria: 	ELLIS, F. B.; HOWSE, K. R.	
Afiliação: 	ARC Letcombe Lab., Wantage, Oxon OX12 9JT, UK.	
Título: 	Effects of cultivation on the distribution of nutrients in the soil and the uptake of nitrogen and phosphorus by spring barley and winter wheat on there soil types.	
Ano de publicação: 	1981	
Fonte/Imprenta: 	Soil & Tillage Research, Amsterdam, v. 1, n. 1, p. 35-46, 1981.	
Idioma: 	Inglês	
Conteúdo: 	The effects of cultivation, ploughing (20-25 cm), tine cultivation (7.5-10 or 15-20 cm) and direct drilling on the distribution of extractable soil P and K were compared on a sandy loam, a calcareous silt loam overlying chalk and a calcareous clay. Effects on the uptake of N and P by spring barley and winter wheat crops were also investigated. Direct drilling and the 2 depths of tine cultivation gave closely similar results and there was an increased conc. of extractable P and K close to the soil surface compared with the more uniform distribution through the tilled layer caused by the inversion of the soil by ploughing. In general, during the season P conc. in the shoot DM and P content/unit area in the crops were not affected by the differences in nutrient distribution. Thus no effects were detected in samples collected at the beginning of stem elongation. However, at anthesis in both crops P content was greater after direct drilling than after ploughing. Ploughing resulted in significantly greater conc. of N in the DM than did the other cultivation treatments. Averaging over both crops at the 3 sites, neither the yields of DM nor the total content of N differed significantly between cultivation treatments. The results give further confidence that simplified cultivation techniques including direct drilling are unlikely, at least in the short term, to affect adversely the uptake of nutrients by cereals. Emphasis is made to the closely similar results in the distribution of nutrients in the soil when it was disturbed to varying depths but without inversion.ADDITIONAL ABSTRACT:The effects of cultivation, ploughing (20-25 cm), tine cultivation (7.5-10 or 15-20 cm) and direct drilling on the distribution of extractable soil phosphate and potassium in 3 soils and on the uptake of nitrogen and phosphate by spring barley and winter wheat were investigated. Direct drilling and the 2 depths of tine cultivation gave similar results and there was an increased concentration of extractable P and K close to the soil surface compared with the more uniform distribution through the tilled layer caused by the inversion of the soil by ploughing. During the season phosphate concentration in the shoot dry matter and in the crops were not affected by the differences in nutrient distribution, but at anthesis in both crops phosphate content was greater after direct drilling than after ploughing. Ploughing resulted in significantly greater concentrations of nitrogen in the dry matter. Averaging over both crops, neither the yields of dry matter nor the total content of nitrogen differed significantly between cultivation treatments.	
Palavras-Chave: 	Fertilização; Trigo (Inverno).	
Thesagro: 	Cevada; Nitrogênio; Solo.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Trigo (CNPT)	
Exemplares: 	CNPT - (21039-1) - ADD - SP - -- - 07120 -  - 07120 - DIS