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| Titel: |
Alfalfa cultivar responses to phosphorus and potassium deficiency: Biomass |
| Auteur: |
James, D. W. Tindall, T. A. Hurst, C. J. Hussein, A. N. |
| Verschenen in: |
Journal of plant nutrition |
| Paginering: | Jaargang 18 (1995) nr. 11 pagina's 2431-2445 |
| Jaar: |
1995-11 |
| Inhoud: |
Soil phosphorus (P) fertility needs for alfalfa (Medicago sativa L.) in the intermountain western United States have been a concern since the inception of irrigation during the late 19th century. Soil potassium (K) fertility needs have received much less attention because K deficiencies, related to long term use of high quality, low-K irrigation water, have developed only in recent years. The objectives of this research were to compare the responses of five commercial alfalfa cultivars (CVs) to phosphorus (P) and K deficiency and to examine the interactions between CVs and P and K soil fertility. An experiment was established on a highly calcareous Redfield silt loam soil (Fine-silty carbonatic, mesic Xeric Torrifluvents) that was low in both P and K. The CVs, planted in 1988, were studied through 1993. A 3x3 complete factorial combination of P and K fertilizer rates was established in a split plot design where CV was the whole plot. There was a significant CV x year interaction in biomass production that was not related to diseases or insects. There was also a significant CV x P interaction within and among years. Response to K fertility, though significant, was not prominent in this trial. Alfalfa CV performance trials should segregate CVs best adapted to short term (2-3 year) rotations from those best adapted to long term (4-5 year) rotations. Fertilizer effects on low-K calcareous soils are short lived; moderate rates of K fertilizer should be applied each spring. Soil P requirements of alfalfa can be met by applying small rates annually or by applying enough for a 4- to 5-year rotation. Phosphorus-use efficiency by alfalfa may be improved by plant breeding and selection for this trait. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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