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| Effects of Pinching Position and Frequency on Growth and Yield of Tomato under Long-season Cultivation in Solar Greenhouse |
| LI Nan1，LIU Xigang1，LI Jing1，2，3，JI Tuo1，2，3，WEI Min1，3，YANG Fengjuan1，2，3* |
| 1College of Horticulture Science and Engineering，Shandong Agricultural University，Tai’an 271018，Shandong，China；2Key Laboratory of Biology and Genetic Improvement of Horticultural Crops（Huanghuai Region），Ministry of Agriculture and Rural Affairs，Tai’an 271018，Shandong，China；3Shandong Province Collaborative Innovation Center of Fruit and Vegetable，Tai’an 271018，Shandong，China |
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Abstract Aiming to address the issues of premature senescence，yield decline，and reduced quality caused by inadequate plant management under long-season cultivation of tomato in solar greenhouse，this study examined the effects of different pinching positions and frequencies on growth，flowering and fruit setting time，and yield，using tomato cultivar ‘Shengluolan 3689’and no pinching as control（CK）．Three treatments involving pinching every 4 clusters（T1），6 clusters（T2）and 8 clusters（T3）were set．The results indicate that as the growth period extended，the plant height and stem diameter of tomato increased under all treatments．Additionally，the photosynthetic pigment content and the net photosynthetic rate of lateral branch leaves initially increased，followed by a decrease．Compared to CK，the stem length and yield of the T1，T2 and T3 treatments increased，and the tomato harvest period was extended．The plant height，stem diameter，and yield increased by 8.7%，3.8% and 7.1%，respectively，under the T1 treatment at 240 days after planting．Under T1 treatment，the ripening times for the first 4 clusters of fruits were 9，22，29，10 days earlier，and the harvest times were 12，28，15，9 days earlier．Additionally，the harvesting period for the 14th cluster of fruit was extended by 19 days．The economic benefit of T1 treatment was superior．In summary，pinching every 4 clusters is beneficial for the growth and yield formation of tomato under longseason cultivation，which can also partially alleviate the shortage of tomato products during the Spring Festival and Summer vacation time，and can be used as a method to regulate plant growth for the long-season，highquality，and high-yield cultivation of tomato．
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Received: 13 July 2023
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