Balanced and adequate nutrition of phosphorus and sulphur in pasture
| Autor: | J. D. Morton, J. D. Morrison, L. C. Smith, A. G. Sinclair, Ken G. Dodds |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | New Zealand Journal of Agricultural Research. 41:487-496 |
| ISSN: | 1175-8775 0028-8233 |
| DOI: | 10.1080/00288233.1998.9513332 |
| Popis: | Pasture production responses and nutrient concentrations from 5 rates of phosphorus (P) (0, 10,20,40, 80 kg ha−1) and sulphur (S) (0,5, 10,20,40 kg ha−1) applied three times in two years were measured on a direct‐drilled ryegrass/white clover pasture in a small plot mowing trial on a site with low fertility (initial soil Olsen P 5 μg ml−1, soil sulphate‐S 3 μg g−1, soil organic‐S 4 μg g−1) over two years. There were responses in total pasture and clover DM (dry matter) production to P and S in the second year. The response to S was much greater than to P. A bivariate Mitscherlich‐related equation accounted for 88–96% of the variation in measured values of clover DM production and ratios of P, S, and nitrogen (N) concentrations. The fitted equations were used to identify ratios of clover P, S, and N concentrations that resulted in balanced and adequate nutrition. Two nutrient elements are in balance when the yield response to one added on its own in relation to the maximum, equals the possible res... |
| Databáze: | OpenAIRE |
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