A whole-canopy gas exchange system and field managements effects on strawberry whole-canopy photosynthesis
Date Issued
2012
Date
2012
Author(s)
He, Meng-Hsun
Abstract
Investigation of plant physiology performances in fields could assist researchers to evaluate the effects of environment condition and cultural practices on crop growth and yield. To measure whole canopy gas exchange of strawberry (Fragaria ×ananassa Duch.) plants, we designed a portable whole canopy gas exchange system with clear canopy chambers. The clear canopy chambers allow sun light penetration with 17% decrease of light intensity. Air flow was adjusted to maintain a good retention time for gas exchange while minimizing heat accumulation in the chamber. Good correlations among plant size, CO2, and H2O exchange were obtained. We also investigated strawberry growth and whole plant photosynthesis under the plastic tunnel system which is popular in Northern Taiwan. The plastic tunnel system caused 30% declination of light intensity and resulted in 30% reduction of whole canopy photosynthesis in ‘Toyonoka’ strawberries. Consequently, plants under plastic tunnels had 35% less total leaf area and 60% less dry weight then the control. In the third part of this research, we assessed the effects of miticide fenpyroximate on growth and leaf gas exchange in strawberries. 5% fenpyroximate at the concentrations 0, 1, or 2 ml‧l-1 were applied to ‘Toyonoka’ strawberry leaves. The leaf net photosynthesis would increase temporarily one day after fenpyroximate application, but there was no significant influence of fenpyroximate on leaf and flower growth. These results showed that insufficient of light intensity may cause strawberry yield loss, but fenpyroximate is still a good method in non-organic production systems for strawberries protection in the proper application rate which did not injury crops permanently.
Subjects
plastic tunnel system
miticide
transpiration
canopy chamber
leaf area
Type
thesis
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