Fertiliser practice and yield losses in process potato crops grown in Canterbury, New Zealand
| Autor: | E. D. Meenken, A Roberts, B.P. Searle, A.J. Michel, Hamish E. Brown, Sarah M. Sinton, Jeffrey S. Reid, M Manning |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Phosphorus Potassium fungi Yield gap food and beverages chemistry.chemical_element 04 agricultural and veterinary sciences Horticulture Solanum tuberosum 01 natural sciences Nitrogen Nutrient chemistry Agronomy Yield (wine) 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Agronomy and Crop Science Plant nutrition 010606 plant biology & botany Mathematics |
| Zdroj: | New Zealand Journal of Crop and Horticultural Science. 44:41-57 |
| ISSN: | 1175-8783 0114-0671 |
| Popis: | In Canterbury, New Zealand, potato (Solanum tuberosum L.) growers are concerned that current fertiliser inputs limit yields. We tested if increasing these inputs would enable the crops to achieve their potential yield (Ypot). In four crops, nitrogen (N), phosphorus (P) and potassium (K) fertilisers were applied at or double the growers’ current rates. We also included two rates of calcium (Ca). Tuber yields were compared using ANOVA and by simulation using PARJIB, a nutrient response model. None of the crops achieved Ypot. Yield was unaffected by changes in K or Ca rate. Doubling N and P applications increased yield at one site only (where Ypot was largest but soil P and mineral N concentrations were least). Up to 21% of Ypot was lost because of factors not included in the PARJIB model. Except at the least fertile sites, increasing fertiliser rates is unlikely to improve yield until the non-nutritional causes of yield gaps are identified and remedied. |
| Databáze: | OpenAIRE |
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