Diurnal changes in net photosynthetic rate in potato in two environments |
| |
Authors: | Joginder Singh Manhas N P Sukumaran |
| |
Institution: | (1) Central Potatc Research Institute, 171 001 Simla, India |
| |
Abstract: | Summary Diurnal changes in net photosynthetic rate were measured in a furrow-irrigated potato crop and in a riverbed crop where the
water table was always maintained at 20–28 cm from the soil surface. In the irrigated crop, the photosynthetic rate during
mid-afternoon was about half the peak rate observed at noon. This reduction was accompanied by a near tripling of stomatal
resistance, a 45% reduction in transpiration, and a 5-fold increase in the difference between leaf and air temperatures. No
such changes were observed in the riverbed crop where the photosynthetic rate remained nearly constant at about 0.9 mg m−2 s−1 between 9 a.m. and 4 p.m. Tuber yield in the riverbed crop was about 30% higher than in the irrigated crop. |
| |
Keywords: | gas exchange stomatal resistance mid-afternoon closure |
本文献已被 SpringerLink 等数据库收录! |