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| Titel: |
Growth and composition of alfalfa fertilized in greenhouse trials with deproteinized juice from low and high saponin alfalfa and from oat herbage |
| Auteur: |
Welch, David A. Smith, Dale Soberalske, R. M. Ream, H. W. |
| Verschenen in: |
Journal of plant nutrition |
| Paginering: | Jaargang 1 (1979) nr. 2 pagina's 151-170 |
| Jaar: |
1979 |
| Inhoud: |
Alfalfa (Medicago sativa L.) must be fertilized adequately to maintain high herbage yields. The deproteinized alfalfa juice (DAJ) remaining after the protein is extracted from green alfalfa has been used to fertilize alfalfa and other crops, but plant damage has occurred at application depths greater than 1.25 cm. The objective of the current greenhouse studies was to determine the response of alfalfa to fertilization with low and high saponin DAJ, and fertilization with DAJ compared with deproteinized oat (Avena sativa L.) juice (DOJ). The deproteinized plant juices were applied to alfalfa stubble after herbage harvest, and the alfalfa herbage was cut three times each time it reached first flower stage. Alfalfa plants were grown in Piano silt loam (Typic Argiudoll) or in Dodge silt loam (Typic Hapludalf) soil. Yields of alfalfa herbage were not significantly different when low and high saponin DAJ was applied in a single application at the same rate (0.625 cm to 3.75 cm). This also was the case when DAJ was compared with DOJ applied in a single application (1.25 to 3.75 cm), with one exception. At the 2.50 cm rate, alfalfa herbage yields were significantly lower for DAJ than for DOJ. Regardless of the source of depToteinized juice, alfalfa herbage yields were increased over the control with a 1.25 cm application, but were reduced at rates applied in a single application above 2.50 cm., with one exception. At the 2.50 cm rate of DOJ, herbage yields were similar to those of the control. However, yields were increased over the control when 2.50 cm of DAJ or DOJ were applied in a split application. Concentrations of K, Cl, and Mn in first-harvest alfalfa herbage were increased over the control when the juices were applied, while other elemental concentrations were reduced. It was concluded that source of the deproteinized juice was not the major factor in alfalfa plant damage, but that rate of application was a major factor. Saponins did not appear to be a damaging agent. Plant damage at increased rates may be due to the accumulation of Cl, to a lack of oxygen in the soil, or to unknown phytotoxins contained in the juices or produced from microfloral breakdown products. Further work is needed to confirm which of these is the principal damaging factor. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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