Comparative evaluation of low cost greenhouse and its effect on the yield and quality of two varieties of tomato (Lycopersicon esculentum Mill.)
Ganesan, M. (2002) Comparative evaluation of low cost greenhouse and its effect on the yield and quality of two varieties of tomato (Lycopersicon esculentum Mill.). Indian Agriculturist, 46 (3 & 4). pp. 161-168.
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Studies were carried out to evaluate the performance of low cost naturally ventilated greenhouse in comparison to open field conditions and its effect on the yield and quality of fruits of two varieties of tomato (Vaishali and PKM1) in two seasons (Kharif and Rabi) during 1999 to 2000. The open field condition served as the ‘control’ (T5) for the four different types of low cost naturally ventilated greenhouses. They were T1 - fully covered with UV film sheet (both sides of the door kept open for ventilation during day time), T2- entire roof covered with UV film sheet and four sides covered with 25% shade net, T3 – four sides and triangular structured roof on both sides covered with 25% shade net and the parallelograms of the structured roof covered with UV film sheet and T4- entire roof and half the portion of four sides covered with UV film sheet from the top, the remaining half covered with 25% shade net. Yield and fruit quality were quantified and compared. Results of the study indicated that greenhouse with ventilation gaps in four side walls had significant effect on tomato (cv. Vaishali) (T2), whereas greenhouse with ventilation gaps in the triangular roof and four sidewalls (T3) was found to be more effective for PKM 1 variety of tomato. The leaf chlorophyll content was not affected by the treatment in both the varieties. But the fruit of vaishali variety had significantly higher total sugar and reducing sugar contents in T1 and T2 on 90th day after planting. Protein and nitrogen contents were increased in T3 and T4 on the 60th day compared to the open field condition (control). In the case of PKM 1 variety, total sugar, reducing sugar, protein and nitrogen contents in leaf were not significant by affected by the treatments. The lycopene content in the fruits of PKM1 and vaishali varieties were found to be significantly superior in T3 greenhouse model while other quality parameters viz., total sugar, reducing sugar, protein and nitrogen contents did not vary significantly due to greenhouse treatments.
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