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Xiaotao Ding, Liyao Yu, Yuping Jiang, Shaojun Yang, Lizhong He, Qiang Zhou, Jizhu Yu, and Danfeng Huang

Changes in leaf length, width, area, weight, chlorophyll and carotenoids contents, and photosynthetic variables with different leaf positions were investigated in fruit cucumber. Plants were grown on rockwool slabs in an environmentally controlled greenhouse and irrigated by drip fertigation. Leaf measurements were conducted from the first to the 15th leaf (the oldest to the youngest). The results showed that fresh weight per unit leaf area decreased from the second to the 15th leaf. Changes in cucumber leaf length, width, and area followed quadratic models from the first to the 15th leaf. The quadratic models of leaf length, width, and area fit the measurements well, with R 2 values of 0.925, 0.951, and 0.955, respectively. The leaf chlorophyll a and b and carotenoid contents increased from the oldest leaf (first leaf) to the youngest leaf and decreased after reaching the highest values. Changes in the net photosynthetic rate (Pn) also followed the quadratic model from the first to the 15th leaf, with R 2 values of 0.975. The leaf transpiration rate (Tr) increased from the first to the 14th leaf. Our results revealed patterns in leaf growth and photosynthetic changes at different leaf positions in fruit cucumber and improved our understanding of the growth and development of fruit cucumber in the greenhouse production system.

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Christopher J. Currey and Roberto G. Lopez

confidence in their greenhouse plant production skills. Methodology The TCM activities were integrated into two different courses with greenhouse production emphases and experiences, one at PU (West Lafayette, IN) in 2011 and 2013 and one at ISU (Ames, IA) in

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Daniel E. Wells, Jeffrey S. Beasley, Lewis A. Gaston, Edward W. Bush, and Maureen E. Thiessen

Soilless substrates common to nursery and greenhouse production are often characterized as having high percolation rates ( Zhu et al., 2007 ) and low P-sorption capacities ( Bilderback, 2001 ; Yeager and Barrett, 1984 ). Many growers compensate for

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Jonathan M. Frantz, Bryon Hand, Lee Buckingham, and Somik Ghose

this reason, energy costs are second only to labor costs as the most expensive factor in indirect costs of greenhouse production. While oil and natural gas prices fluctuated by 100% or more in the last 3 years, generally, fuel prices have risen by 50

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Guihong Bi, Williams B. Evans, and Glenn B. Fain

alternative substrate component for greenhouse production. Materials and Methods Substrate treatments, plant material, and sampling. Studies were conducted in a greenhouse at the Mississippi State University Truck Crops Branch Experiment Station in Crystal

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Robin G. Brumfield, Laura B. Kenny, Alyssa J. DeVincentis, Andrew K. Koeser, Sven Verlinden, A.J. Both, Guihong Bi, Sarah T. Lovell, and J. Ryan Stewart

As a high-input industry, greenhouse production relies on many nonrenewable and petroleum-based products. Pesticides, fertilizers, heating, irrigation, and plastic packaging rank among such inputs, which are associated with undesirable environmental

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Andrew K. Koeser, Sarah T. Lovell, Aaron C. Petri, Robin G. Brumfield, and J. Ryan Stewart

burned and are likely reclaimed at rates much lower than the overall average ( Garthe and Kowal, 1994 ). Beyond end-of-life considerations, container selection can have a number of impacts on the overall sustainability of greenhouse production

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Tonghua Pan, Juanjuan Ding, Gege Qin, Yunlong Wang, Linjie Xi, Junwei Yang, Jianming Li, Jing Zhang, and Zhirong Zou

During the autumn/spring “off” season, yield and quality of tomatoes are often affected by insufficient CO2 and low light in greenhouse production. Although tomato is one of the most widely cultivated vegetables, few studies have investigated the interactive effects of supplementary light and CO2 enrichment on its growth, photosynthesis, yield, and fruit quality in greenhouse production. This study investigates the effects of supplementary light (200 ± 20 μmol·m–2·s–1) and CO2 enrichment (increases to about 800 μmol·mol–1), independently and in combination, on these parameters in autumn through spring tomato production. Compared with tomatoes grown under ambient CO2 concentrations and no supplementary light (CaLn), supplementary light (CaLs) and supplementary light and CO2 enrichment (CeLs) significantly promoted growth and dry weight accumulation. Meanwhile, CO2 enrichment (CeLn) and CaLs significantly improved photosynthetic pigment contents and net photosynthetic (Pn) rates, whereas CeLs further improved these and also increased water use efficiency (WUE). CeLn, CaLs, and CeLs significantly increased single fruit weight by 16.2%, 28.9%, and 36.6%, and yield per plant by 19.0%, 35.6%, and 60.8%, respectively. The effect of supplementary light on these parameters was superior to that of CO2 enrichment. In addition, CaLs and CeLs improved nutritional quality significantly. Taken together, CeLs promoted the greatest yield, WUE, and fruit quality, suggesting it may be a worthwhile practice for off-season tomato cultivation.

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Qinglu Ying, Yun Kong, and Youbin Zheng

; Xiao et al., 2012 ). In some regions that have long and cold winters, like Canada, winter production of microgreens in local greenhouses has become an option. The profits of greenhouse production of fruits and vegetables such as tomato and cucumber are

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Pauline H. Andrews and P. Allen Hammer

Three cultivars each of zonal geranium (Pelargonium ×hortorum `Candy Lavender', `Fireball', and `Patriot Red') and ivy geraniums (Pelargonium pelatum `Global Deep Lilac', `Global Salmon Rose', and `Global Soft Pink') were grown in root media with pHs varying from 4.3 to 7.8. In Expt. 1, a mixture of sphagnum peat, fine perlite, and fine pine bark was modified with limestone and hydrated lime at the following rates: 0, 1.2, 3.0, 4.7, and 11.9 kg·m–3 limestone; 11.9 limestone plus 5.9 hydrated lime; 11.9 limestone plus 8.3 hydrated lime; and 11.9 kg·m–3 limestone plus 10.7 kg·m–3 hydrated lime to give the various root medium pH treatments. Plants were grown for 11 weeks in glass greenhouses. In Expt. 2, plants were grown in two commercial soilless mixes with one being modified with the addition of 0 kg·m–3 limestone, 6.0 kg·m–3 limestone plus 0.6 kg·m–3 hydrated lime, and 6.0 kg·m–3 limestone plus 2.4 kg·m–3 hydrated lime. In both experiments, greatest dry weight was recorded in zonal and ivy geraniums plants grown at root medium pHs above 6.4. This study showed a root medium pH of 6.4 to 6.5 should be recommended for the greenhouse production of both zonal and ivy geraniums.