Yield and water use of temperate pastures in summer dry environments
| العنوان: | Yield and water use of temperate pastures in summer dry environments |
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| المؤلفون: | Moot, Derrick, Brown, H, Pollock, K, Mills, A |
| المصدر: | Proceedings of the New Zealand Grassland Association |
| بيانات النشر: | New Zealand Grassland Association. |
| سنة النشر: | 2008 |
| المجموعة: | Lincoln University (New Zealand): Lincoln U Research Archive |
| مصطلحات موضوعية: | water use efficiency, temperate pasture species, Cichorium intybus, Dactylis glomerata, T. subterraneum, Lolium perenne, Medicago sativa, Trifolium ambiguum, T. michelianum, T. pratense, T. repens |
| جغرافية الموضوع: | Blenheim |
| Time: | Marlborough Convention Centre, Blenheim |
| الوصف: | The water use efficiencies (WUE) of a range of temperate pasture species were calculated from measurements on several different dryland and irrigated pastures in Canterbury. The annual WUE ranged from 6.7 kg DM/ ha/mm for a dryland cocksfoot pasture to 40 kg DM/ha/ mm for a dryland lucerne crop grown on a Wakanui silt loam soil. The lucerne crop extracted 328 mm of water to at least 2.3 m depth. Its deep root enabled high recovery of rainfall stored in the soil profile. By comparison a perennial ryegrass pasture only extracted 243 mm of water to 1.5 m depth on the same soil type and it had an annual WUE of 18 kg DM/ha/mm. Where practical, species with deep roots should be sown on deep free draining soils to extract all available soil water. On a stony Lismore soil, perennial ryegrass extracted 129 mm of water to a depth of 1.5 m. On a more stony, shallower soil, at the same location, lucerne extracted 131 mm to a depth of 2.3 m. Both pastures had similar annual DM yields and an annual WUE of 16 kg DM/ha/mm. Within the year WUE of the ryegrass pasture ranged from 3 to 22 kg DM/ha/mm. This seasonal variability reflected how soil moisture deficit, soil evaporation and drainage affected pasture growth. During spring, when moisture was non-limiting, clover monocultures and binary mixtures had higher WUEs than pure grass swards due to higher herbage nitrogen (N). Furthermore, a cocksfoot monoculture had an annual WUE of 38 kg DM/ha/mm when fertilised with N but it was only 17 kg DM/ha/mm when unfertilised. These results suggest WUE can be maximised annually and seasonally by growing monocultures of legumes, such as lucerne, adopting grazing management to enhance clover production or strategic application of N fertiliser to maximize growth when soil moisture is available. ; Financial assistance for PhD scholarships was provided for H.E. Brown by FoRST Bright Futures and for A. Mills by Meat & Wool NZ, AGMARDT, the Cocksfoot Growers Association and Sinclair Cummings Trust. |
| نوع الوثيقة: | other/unknown material |
| وصف الملف: | pp.51-57 |
| اللغة: | English |
| تدمد: | 0369-3902 1179-4577 |
| Relation: | The original publication is available from New Zealand Grassland Association. - https://doi.org/10.33584/jnzg.2008.70.2724 - http://dx.doi.org/10.33584/jnzg.2008.70.2724; https://doi.org/10.33584/jnzg.2008.70.2724; Proceedings of the New Zealand Grassland Association; https://researcharchive.lincoln.ac.nz/bitstream/10182/4475/4/Moot_Brown_Pollock_%26_Mills_2008.pdf.jpg; Moot, D.J., Brown, H.E., Pollock, K. & Mills, A. (2008). Yield and water use of temperate pastures in summer dry environments. Proceedings of the New Zealand Grassland Association, 70, 51-57.; https://hdl.handle.net/10182/4475 |
| DOI: | 10.33584/jnzg.2008.70.2724 |
| الاتاحة: | https://hdl.handle.net/10182/4475 https://doi.org/10.33584/jnzg.2008.70.2724 |
| Rights: | Copyright © The Authors and New Zealand Grassland Association. |
| رقم الانضمام: | edsbas.B3520D6F |
| قاعدة البيانات: | BASE |
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| تدمد: | 03693902 11794577 |
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| DOI: | 10.33584/jnzg.2008.70.2724 |