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ISHS Acta Horticulturae 1253: XXX International Horticultural Congress IHC2018: International Symposium on Water and Nutrient Relations and Management of Horticultural Crops

Effects of super-absorbent polymers with different granularities on the physicochemical properties of substrate and the growth of lettuce seedlings

Authors:   Pei-xuan Xin, Yu Han, Ying-yan Han, Jing-hong Hao, Chao-jie Liu, Shuang-xi Fan
Keywords:   lettuce, super-absorbent polymers, seedling, growth
DOI:   10.17660/ActaHortic.2019.1253.51
The suitable granularities of super-absorbent polymers (SAP) in substrate for the growth of lettuce seedlings was studied. An experiment was conducted on two different granularities 40 mesh (T1) and 20 mesh (T2) SAP in substrate and substrate without SAP as control. The effects of different granularities SAP on the physicochemical properties of the substrate, morphological indexes and the physiological indexes of lettuce seedlings were investigated. The results showed that the electrical conductivity (EC) value of T1 and T2 respectively increased by 5.53 and 4.63% compared with the control, and the pH of T1 and T2 respectively increased by 13.23 and 11.76% compared with the control. The saturated water absorption of T2 increased by 9.62% compared with the control; the saturated water absorption capacity of T1 and T2 increased significantly by 6.95 and 5.85%. The fresh weight, dry weight, root shoot ratio, and seedling index of T1 and T2 were increased significantly. The biomass of T1 was significant increased. The chlorophyll a, chlorophyll b and total chlorophyll content of T1 were significantly increased. The net photosynthetic rate and transpiration rate of the lettuce seedlings were significantly increased in T1 and T2. The net photosynthetic rate of T1 was increased by 14.82% compared to T2. The results showed that 40 mesh and 20 mesh SAP in substrate can significantly promote the growth of lettuce seedlings, with 40 mesh SAP in substrate for lettuce seedling recommended.

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