Influence of nitrogen fertiliser and varieties on plant water relations in potatoes
| MSI99P0014 | |
| Wong Yen Cheong, K. | |
| University of Reading, Department of Agricultural Botany, Reading, GB | |
| Influence of nitrogen fertiliser and varieties on plant water relations in potatoes | |
| Thesis, M.Sc. | |
| Thesis | |
| 1988 | |
| 80 p.: 27 figs., 4 tbls., 2 appen | |
| En | |
| En | |
| The objective of this study was to investigate the possibility of using an Ohm's law analogue type model to study the influence of N application and varieties on crop water relations. Field measurements were found to be highly influenced by environmental conditions. The environmental factors influencing stomatal conductance were highly correlated. A function was produced to relate stomatal conductance to irradiance, saturation deficit and leaf water potential. The main effect of nitrogen was to increase the evaporative demand by increasing the size of the canopy. Higher rates of evaporation at high N levels did not increase leaf water stress because plants in high nitrogen had a larger root system. Varieties differed in their leaf water status. In similar environmental conditions, Cara had a higher leaf water potential than Wilja. As differences in transpiration rates between the two varieties were not evident, it was deduced that Cara had a lower plant resistance. The low plant resistance in Cara was highly correlated with a higher root length density. | |
| POTATOES PLANT NUTRITION NITROGEN PLANT WATER RELATIONS VARIETIES PHYSIOLOGY | |
| MAURITIUS | |
| Potatoes: physiology | |
| Plant water relations | |
| 633.491 7 | |
| 1991-10-07 | |
| En | |
| Mauritius Sugar Industry Research Institute | |
| LIB | |
| CAT | |
| 1 | |
| FC |