scholarly journals Heat transfer assessment of multi-tier chilling pipes for root zone cooling system under crop protection structure in the tropics

2021 ◽  
Vol 2 (2) ◽  
pp. 1-7
Keyword(s):  
Root Zone ◽  
Cooling System ◽  
Crop Protection ◽  
Growth Media ◽  
Root Zone Temperature ◽  
Environment Temperature ◽  
Significant Difference ◽  
Crop Root ◽  
Single Pipe ◽  
The Tropics

Root zone cooling technique has become an alternative cultivation method for temperate crops production in the tropics instead of cooling the aerial environment of the greenhouse. In this experiment, the root zone cooling system was incorporated with a multi-tier crop cultivation structure. This structure consisted of five tiers arranged in an A-shape design and was placed under an open rain shelter, thus, left it to undergo fluctuating environment temperature. There were five pillow polybags inserted with cocopeat and were placed on the structure. Each pillow polybag consisted of a single pipe that was buried inside the growth media located near the root zone area. This pipe that was connected to the chilled system acted as a cooling agent in controlling the growth media temperature. The objective of the study was to evaluate the Root Zone Cooling (RZC) system performance in distributing and controlling water-dissolved nutrient temperatures to meet crop-root requirement needs. From the experiment conducted, it was found that there was no significant difference between root zone temperature at different levels and lengths on multi-tier structure. The chilling pipes was able to distribute the temperatures to meet crop-root requirement needs along the multi-tier structure.

scholarly journals INFLUENCE OF ROOT ZONE TEMPERATURE ON GROWTH, YIELD, AND PHENOLOGY OF SWEETPOTATOES GROWN IN NFT

HortScience ◽  
1995 ◽  
Vol 30 (3) ◽  
pp. 429d-429
Author(s):  
Philip A. Loretan ◽  
Fred A. Avicki ◽  
Desmond G. Mortley ◽  
Wiletha Horton
Keyword(s):  
Nutrient Solution ◽  
Temperature Control ◽  
Ipomoea Batatas ◽  
Root Zone ◽  
Cooling System ◽  
Block Design ◽  
Growth Yield ◽  
Solution Temperature ◽  
Root Zone Temperature ◽  
Zone Temperature

A cooling system using the principles of heat transfer was designed to provide a temperature difference of 6C between root and shoot zones and to study the effect of this difference on growth, yield, and phenology of `TI-155' sweetpotato [Ipomoea batatas (L.) Lam.] grown using the nutrient film technique in a greenhouse. Treatments were temperature control (20C) and variable temperature (26C) in a randomized complete-block design with two replications. A modified half Hoagland's nutrient solution with a 1 N: 2.4 K ratio was used and was changed every 2 weeks. Nutrient solution pH was maintained between 5.5 and 6, and electrical conductivity, salinity, and solution temperature were monitored at regular intervals. Storage root fresh and dry weights (except for fibrous root dry weight) and foliage fresh and dry weights were not significantly influenced by root zone temperature. Leaf expansion rate and vine length were lower for root zone temperature control plants; stomatal conductance, transpiration, and leaf unfolding rates were similar for both treatments.

scholarly journals Root-zone Temperature Distribution in Hydroponic System for Chili Cultivation in the Tropics

2019 ◽  
Vol 07 (1) ◽  
pp. 25-32
Author(s):  
Wenny Amaliah ◽  
◽  
Herry Suhardiyanto ◽  
Muhamad Syukur ◽  
◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Root Zone ◽  
Root Zone Temperature ◽  
Hydroponic System ◽  
The Tropics ◽  
Zone Temperature
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