Application of Pot-In-Pot System and Spectral Reflectance Method on Nursery Production
Date Issued
2008
Date
2008
Author(s)
Chang, Min-Yi
Abstract
Pot-in-pot system (PIP) can be divided into above-ground pot-in-pot (AGPIP) and in-ground pot-in-pot (IGPIP). IGPIP has been expanding rapidly during the past decade because of many advantages. In a below ground pot-in-pot system, a holder or socket pot is permanently positioned in ground and a container plant is then placed inside the socket pot. In our researches, the substrate temperature of IGPIP is lower（4-7.5 ℃） than above-ground conventional production method (AGC) in spring and summer. In winter, the substrate temperatures of IGPIP and AGC have no significant difference. Furthermore, AGPIP can’t lower the substrate temperature that it shows slight variations with AGC. Height, canopy diameter, shoot dry weight, and root dry weight of Begonia (Begonia semperflorens-cultorum ‘Super Olympia Red’)、celosia (Celosia argentea var. plumosa)、mexican violet (Exacum affine) produced IGPIP are greater, respectively, than plants grown AGC in summer. Besides, the flower condition (such as the first day of visible bud or anthesis, flower number, flower size, and inflorescence dry weight) of plants grown IGPIP are still better than plants produced AGC. For begonia grown IGPIP, net photosynthetic rate, stomatal conductance, transpiration rate are greater than plants grown AGC and AGPIP. In water deficient condition, begonia grown IGPIP have greater CMR and Fv/Fm values but lower leaf temperature. To examine the effects of AGC, IGPIP, and in-field production method (IF) on growth and recovery rate after transplanting of britton''s wild petunia (Ruellia brittoniana) and golden dewdrop (Duranta repens L.). Compared with AGC, plants grown IGPIP have greater biomass and Fv/Fm value (in drought condition). Compared with IF, plants grown IGPIP have fast recovery rate. eaf spectral reflectance is sensitive to stress such as nutrient deficiency and drought. Begonias are treated with different production methods (AGC、AGPIP、IGPIP), fertilization rates (0、0.5、1.0、2.0、4.0 g•L-1) and drought (frequency of irrigations are 5 days, 10 days, 20 days, 35 days, respectively). Reflectance ratio in red edge position(720-690 nm), red lights and green lights (660-500 nm) of plant grown AGC are higher than plants grown AGPIP and IGPIP; in the near-infrared potions, plant grown IGPIP have the greatest reflectance ratio, especially 860nm, 840 nm, and 780 nm. The wavelengths of green lights, red lights, and red edge positions are apparently affected by fertilization rates (negative linear correlation). However, the near-infrared potions are affected by different drought treatments (plant water content is positive linear correlation with reflectance ratio in the near-infrared potions). lant grown IGPIP has higher PRI, NDVI, SR, CHL values than plant grown AGC. Vegetation indices of NDVI, SR, CHL, NIR/G and G/R could successfully assess chlorophyll content. Under drought treatments, NDVI and PRI are positive linearly related to plant water content (PWC).n the research, we prove that IGPIP and spectral reflectance methods have great potential can be used in nursery production in Taiwan.
Subjects
Pot-In-Pot(PIP)
Spectral Reflectance
Vegetation index
Type
thesis
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