Water-Soluble Carbohydrate Recovery in Pastures of Perennial Ryegrass (Lolium perenne L.) and Pasture Brome (Bromus valdivianus Phil.) Under Two Defoliation Frequencies Determined by Thermal Time
| Autor: | Máximo Alonso, Juan Pablo Keim, Oscar Balocchi, Ignacio F. López, Iván Calvache |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Water soluble carbohydrate Perennial plant accumulate growing degree days Plant Science 01 natural sciences Lolium perenne Pasture blades Grazing Phyllochron lcsh:Agriculture (General) geography geography.geographical_feature_category biology Bromus 04 agricultural and veterinary sciences Growing degree-day leaf sheaths biology.organism_classification lcsh:S1-972 Agronomy phyllochron 040103 agronomy & agriculture 0401 agriculture forestry and fisheries grass regrowth Agronomy and Crop Science 010606 plant biology & botany Food Science |
| Zdroj: | Agriculture, Vol 10, Iss 563, p 563 (2020) Agriculture Volume 10 Issue 11 |
| ISSN: | 2077-0472 |
| Popis: | The objectives of the experiment were to (i) examine the dynamics of WSC use and the recovery of leaf sheaths and blades of Bromus valdivianus Phil. and Lolium perenne L. subjected to two defoliation frequencies (DFs) determined by thermal time (TT) (ii) evaluate how DF influenced regrowth and accumulated herbage mass (AHM) during fall. Defoliation was carried out at frequencies of 135 and 270 accumulated growing degree days (AGDDs) for both species. Twelve plots were arranged in a three-block design. All plots had a conditioning period to establish the assigned DF prior to sampling. From the start of the experiment, &ldquo cores&rdquo were collected from each plot every three days until the DF was reached. Every core was separated into leaf and sheath material before measuring the WSC concentration. Lolium perenne had concentrated more WSCs than B. valdivianus. Both species adapted their WSC recovery according to the DF. The recovery of WSC was faster under a DF of 135 AGDDs than that of 270 AGDDs. Leaf sheaths contained more WSCs than leaf blades and were identified as WSC storage organs. This period can be used as the optimal defoliation interval in B. valdivianus and L. perenne grazing systems. |
| Databáze: | OpenAIRE |
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