Effect of temperature gradient generated by fan-pad cooling system on yield of cabbage grown using fertigation technique under side netted rain shelter

Rezuwan Kamaruddin, . and Mahamud Shahid, . and Fadhilah Annaim Huda Hashim, . and Yaseer Suhaimi Muhammad, . and Mohamad Abdul Manas, . and Azman Jalaludin, . Effect of temperature gradient generated by fan-pad cooling system on yield of cabbage grown using fertigation technique under side netted rain shelter. pp. 1-9. ISSN 1394-9829

A field experiment was carried out to determine the effect of temperature gradient generated by fan-pad cooling system on yield of KY Cross cabbage grown using fertigation technique under 30 m long x 10 m wide x 4.5 m high rain shelter with side netting. The fan-pad cooling system provides evaporative cooling inside the shelter and lowers the air temperature significantly below ambient. The temperature in the structure was 3“5 C lower than the outside temperature. With 70 efficiency the system was able to reduce from 42C of the outside air to 33.6 C when exiting the cooling pad. However the temperature in the shelter increased as the air moved from cooling pad towards the exhaust fans producing a temperature gradient across the length of the shelter (up to 4.5C). The temperature gradient caused a negative correlation between the cooling pad distance and the canopy diameter as well as yield of cabbage. The average canopy diameter (77.34 cm) and cabbage head weight (2.62 kg) after 75 days were significantly higher towards the cooling pad. The further the distance between the plants and the cooling pad the smaller the canopy diameter (48.85cm) and cabbage head weight (0.65 kg). Grade 1 cabbage heads were produced from the first 12.35 m from the cooling pad (average weight 2.5 kg). At 15.35“21.35 m the cabbage heads fall into grade 2 with an average weight of 1.33 kg while grade 3 cabbage heads were produced between 24.35“27.35 m from the cooling pad.

Full text available from: Official URL: http://jtafs.mardi.gov.my/jtafs/39-1/Temperature%2...

Abstract

A field experiment was carried out to determine the effect of temperature gradient generated by fan-pad cooling system on yield of KY Cross cabbage grown using fertigation technique under 30 m long x 10 m wide x 4.5 m high rain shelter with side netting. The fan-pad cooling system provides evaporative cooling inside the shelter and lowers the air temperature significantly below ambient. The temperature in the structure was 3“5 C lower than the outside temperature. With 70 efficiency the system was able to reduce from 42C of the outside air to 33.6 C when exiting the cooling pad. However the temperature in the shelter increased as the air moved from cooling pad towards the exhaust fans producing a temperature gradient across the length of the shelter (up to 4.5C). The temperature gradient caused a negative correlation between the cooling pad distance and the canopy diameter as well as yield of cabbage. The average canopy diameter (77.34 cm) and cabbage head weight (2.62 kg) after 75 days were significantly higher towards the cooling pad. The further the distance between the plants and the cooling pad the smaller the canopy diameter (48.85cm) and cabbage head weight (0.65 kg). Grade 1 cabbage heads were produced from the first 12.35 m from the cooling pad (average weight 2.5 kg). At 15.35“21.35 m the cabbage heads fall into grade 2 with an average weight of 1.33 kg while grade 3 cabbage heads were produced between 24.35“27.35 m from the cooling pad.

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Item Type:	Article
AGROVOC Term:	Cabbages
AGROVOC Term:	Fertigation
AGROVOC Term:	Cooling systems
AGROVOC Term:	Yields
AGROVOC Term:	Fertigation
AGROVOC Term:	Temperature
AGROVOC Term:	Field experiments
AGROVOC Term:	Evaporative cooling
AGROVOC Term:	Canopy
AGROVOC Term:	Cultivation
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:29
URI:	http://webagris.upm.edu.my/id/eprint/24510

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