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  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Seed yields and water use of cowpeas (Vigna unguiculata [L.] walp.) subjected to planned-water-deficit irrigation (1983)
    Springer
    Irrigation science 3 (1983), S. 237-245 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Cowpeas (Vigna unguiculata [L.] Walp.) were subjected to six irrigation treatments and two levels of soil nitrogen during two seasons under field conditions. Withholding irrigation during the vegetative stage in a rain-free environment following pre-irrigation resulted in lower water use (−11 to −20%) but negligible effects on seed yields (−2 to +3%) providing the irrigation interval during flowering and pod filling was not too great. Lengthening the irrigation interval resulted in less vine elongation and less shoot biomass production. Significant reductions in seed yield were observed only with the longest irrigation interval. The higher level of soil nitrogen resulted in small or negligible increases in shoot biomass production and seed yield. It is proposed that water use of cowpeas can be reduced while maintaining seed yields by planned-water-deficit irrigation. Major increases in water use efficiency may be achieved by withholding irrigation from plant emergence to the first appearance of macroscopic floral buds, providing a moderate supply of water is present in the soil profile and no precipitation occurs. Seed yields will be maintained if cowpeas are irrigated during flowering and podfilling so that there is only a mild to moderate check on plant growth. Maximum shoot biomass and hay production would require frequent irrigation after the appearance of macroscopic floral buds. Methods for guiding planned-water-deficit irrigation are discussed in the following paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272839
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Soil and plant measurements for determining when to irrigate cowpeas (Vigna unguiculata [L.] Walp.) grown under planned-water-deficits (1983)
    Springer
    Irrigation science 3 (1983), S. 247-257 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In a concurrent study we reported that cowpea (Vigna unguiculata [L.] Walp.) had the ability to maintain seed yields when subjected to drought during the vegetative stage provided the subsequent irrigation interval was not too great. A 4 day irrigation interval produced maximum vegetative and seed yields, while an 8 day interval following a vegetative stage drought produced maximum seed yields and water-use-efficiency. Soil and plant measurements were made during flowering and podfilling to develop general methods for scheduling irrigation. Tensiometers provided adequate resolution for maintaining either shoot biomass production or seed yield. Predawn estimates of leaf water potential provided adequate resolution for maintaining seed yield but not biomass production. Measurements of percent actual depletion of available soil water or afternoon values for temperature differences between canopy and air divided by the vapor pressure difference gave adequate resolution for maintaining biomass production. However, nominal depletion of available soil water based upon predicted evapotranspiration appears to be the most practical procedure for scheduling irrigation of cowpeas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272840
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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