Theme 04: Soil Fertility and Plant Nutrition
Archived
This content is available here strictly for research, reference, and/or recordkeeping and as such it may not be fully accessible. If you work or study at University of Kentucky and would like to request an accessible version, please use the SensusAccess Document Converter.
Publication Date
2001
Location
Brazil
Description
The interactions between rates of nitrogen (N) and rates of phosphorus (P), potassium (K) or sulphur (S) on yield of ryegrass dominant swards were measured with no return of mown clippings in Southland, New Zealand. In the second year of the trial, the yield response to 176 kg N ha-1 compared with no N increased only slightly with increasing soil Olsen P from 8 to 91 µg g-1 soil. At 352 and 704 kg N ha-1 there was a large increase in the yield response (from 5 to 9.4 and 11 t DM ha-1 respectively) up to an Olsen P of 55 µg g-1 soil. At 176 kg N ha-1, there was a linear yield response (from 3.5 to 6.5 t DM ha-1) as ammonium acetate extracted soil K increased from 80 to 120 µg g-1 soil. A larger yield response to K (from 3.5 to 13.5 t DM ha-1) was measured up to but not above 240 µg K g-1 soil at 352 and 704 kg N ha-1. The yield response to 352 and 704 kg N ha-1 increased with soil S status (from 8.2 to 11.8 t DM ha-1) up to 15 µg calcium phosphate extractable S g-1 soil. These results demonstrated that yield responses to increasing rates of N do not increase above a threshold level of other soil nutrients.
Citation
Morton, J. D. and Smith, L. C., "Interactions Between the Effects of Nitrogen, and Phosphorus, Potassium and Sulphur on Grass Production" (2001). IGC Proceedings (1985-2023). 18.
(URL: https://uknowledge.uky.edu/igc/19/4/18)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Interactions Between the Effects of Nitrogen, and Phosphorus, Potassium and Sulphur on Grass Production
Brazil
The interactions between rates of nitrogen (N) and rates of phosphorus (P), potassium (K) or sulphur (S) on yield of ryegrass dominant swards were measured with no return of mown clippings in Southland, New Zealand. In the second year of the trial, the yield response to 176 kg N ha-1 compared with no N increased only slightly with increasing soil Olsen P from 8 to 91 µg g-1 soil. At 352 and 704 kg N ha-1 there was a large increase in the yield response (from 5 to 9.4 and 11 t DM ha-1 respectively) up to an Olsen P of 55 µg g-1 soil. At 176 kg N ha-1, there was a linear yield response (from 3.5 to 6.5 t DM ha-1) as ammonium acetate extracted soil K increased from 80 to 120 µg g-1 soil. A larger yield response to K (from 3.5 to 13.5 t DM ha-1) was measured up to but not above 240 µg K g-1 soil at 352 and 704 kg N ha-1. The yield response to 352 and 704 kg N ha-1 increased with soil S status (from 8.2 to 11.8 t DM ha-1) up to 15 µg calcium phosphate extractable S g-1 soil. These results demonstrated that yield responses to increasing rates of N do not increase above a threshold level of other soil nutrients.
