Title:	Soil spatial variability and the estimation of the irrigation water depth.
Authors:	REICHARDT, K. SILVA, J. C. de A. BASSOI, L. H. TIMM, L. C. OLIVEIRA, J. C. M. de BACCHI, O. O. S. PILLOTTO, J. E.
Affiliation:	KLAUS HEICHARDT, UNIVERSIDADE DE SÃO PAULO JOSÉ CARLOS DE ARAÚJO SILVA, EMPRESA MARANHENSE DE PESQUISA AGROPECUÁRIA LUIS HENRIQUE BASSOI, CPATSA LUÍS CARLOS TIMM, UNIVERSIDADE DE SÃO PAULO JULIO CESAR MARTINS DE OLIVEIRA, ESCOLA DE ENGENHARIA DE PIRACICABA OSNY OLIVEIRA SANTOS BACCHI, UNIVERSIDADE DE SÃO PAULO JOÃO EDUARDO PILOTTO, UNIVERSIDADE DE SÃO PAULO.
Date Issued:	2001
Citation:	Scientia Agricola, v. 58, n. 3, p. 549-553, jul./set. 2001.
Description:	The effects of soil water spatial variability previous to irrigation and of the field capacity on the estimation of irrigation water depth are evaluated. The experiment consisted of a common bean (Phaseolus vulgaris L.) crop established on a Kandiudalfic Eutrudox of Piracicaba, SP, Brazil, irrigated by central pivot, in which soil water contents were evaluated with a depth neutron gauge, in a grid of 20x4 points with lag of 0.5 m. In a given situation, the 80 calculated irrigation water depths presented a coefficient of variation of 29.3%, with an average water value of 18 mm, maximum of 41 mm and minimum of 9 mm. It is concluded that the only practical way of irrigation is the use of an average water depth, due to the inherent variability of the soil, and that the search for better field capacity values does not imply in better water depth estimates.
Thesagro:	Água Irrigação Profundidade Umidade do Solo
NAL Thesaurus:	field capacity
Keywords:	Capacidade de campo Espaco Variabilidade Irrigation water depth Soil moisture Spatial variability
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPATSA)