Phosphorus and potassium effects on taproot C and N reserve pools and long-term persistence of alfalfa (Medicago sativa L.)
| Autor: | S. M. Cunningham, William Kess Berg, Sylvie M. Brouder, Jeffrey J. Volenec, Sofia Lissbrant |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Starch Nitrogen Potassium Carbohydrates chemistry.chemical_element Taproot Plant Science Biology 01 natural sciences Plant Roots Persistence (computer science) chemistry.chemical_compound Human fertilization Genetics Medicago sativa Sugar Plant Proteins Phosphorus fungi food and beverages 04 agricultural and veterinary sciences General Medicine Carbon Horticulture chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | Plant science : an international journal of experimental plant biology. 272 |
| ISSN: | 1873-2259 |
| Popis: | Improved P and K nutrition can enhance yield and persistence of alfalfa (Medicago sativa L.) grown on low fertility soils, but it is unknown if the improved agronomic performance is associated with greater taproot N and C reserves. Our objective was to use cluster analysis to determine how alfalfa plant persistence is altered by P and K fertilization, and determine if changes in specific taproot C and/or N reserves were associated with alfalfa plant death. Taproots were dug and plants counted in May and December of each year and taproots analyzed for P, K, starch, sugar, amino-N, and soluble protein. K-means clustering was used to create six clusters that were subsequently compared using two-sample t-tests. Low K in herbage and taproots was associated with low yield and poor persistence of the Low and Very Low clusters and taproots of these plants generally had low starch, protein, and amino-N concentrations. Plants died primarily between May and December. Plant persistence of the low yielding, P-deficient Medium cluster was high and associated with high starch concentrations. Low amino-N concentrations in taproots may provide an early indication of potential plant death because these were evident in poor-persisting Low and Very Low clusters early in the study. |
| Databáze: | OpenAIRE |
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