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Deficit irrigation at different growth stages of the common bean (Phaseolus vulgaris L., cv. Imbabello) 63
Calvache,M.; Reichardt,K; Bacchi,O.O.S.; Dourado-Neto,D..
To identify specific growth stages of the common bean crop at which the plant is less sensitive to water stress, in which irrigation could be omitted without significant decrease hi final yield, two field experiments were conducted at "La Tola" University Experimental Station, Tumbaco, Pichincha, Ecuador, on a sandy loam soil (Typic Haplustoll). The climate is tempered and dry (mean air temperature 16°C and mean relative humidity 74%, during the cropping season) 123 and 109 mm of rainfall were recorded during the experimental cropping periods (July to October), of 1992 and 1994, respectively. The treatments consisted of combinations of 7 irrigation regimes including normal watering; full stress; (traditional management practice); single stress at...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Common bean; Irrigation; Water stress; Water use efficiency.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300002
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Neutron probe calibration correction by temporal stability parameters of soil water content probability distribution 63
Reichardt,K.; Portezan,O.; Bacchi,O.O.S.; Oliveira,J.C.M; Dourado-Neto,D.; Pilotto,J.E.; Calvache,M..
A neutron probe calibration correction is proposed in order to reduce soil water content variability, assumed to be a consequence of improper calibrations relations. The time stability of spatially measured soil water content data is used to correct the intercepts of linear calibration relations. This procedure reduced the coefficients of variation of soil water content data from 4 to less than 2% in a Rhodic Kanhapludalf.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil water content; Neutron probe; Calibration; Time stability; Spatial variability.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300003
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