Root-zone Cooling Effect of Different Water-cooled Seedling Bed and Its Effect on the Growth of Tomato Plug Seedlings

doi:10.3969/j.issn.1000-6362.2016.01.003

Abstract

Abstract:

In order to alleviate high root-zone temperature injury on intensive seedling production during hot summer. A water-cooled seedling bed was designed, in which underground water was used as the natural coolant. Two different water-cooled seedling beds were exploited in this experiment. Metal stainless steel tube(M-type cooled-bed) and plastic tube(P-type cooled-bed) were used as cooling tube respectively. The seedling bed without root cooling system was used as control(CK).The cooling effect of two different water-cooled seedling bed and its effect on the growth of tomato seedling were investigated. The results showed as follows: the cumulative temperature, mean daily temperature and mean daily maximum temperature of the root-zone both in M and P-type cooled-bed were lowered significantly compared with those of non-cooled seedling bed(CK). The mean daily temperature of M and P-type cooled-bed were 23.2℃ and 26.0℃. The mean high temperature duration of M and P-type cooled-bed above 25℃ was 8.3h and 11.6h per day, which were shortened by 7.5h and 4.2h respectively compared with control’s seedling-bed. The growth rate and dry mass accumulation of tomato seedling both in M seedling-bed and P seedling-bed were enhanced significantly, and sap flow velocity, root respiration rate and net photosynthetic rate were also improved. Dry mass of per plant of tomato seedling in two cooled-bed were 4.52mg(M) and 3.90mg(P), which were increased by 58.6% and 36.8% respectively compared with control. Tomato seedling healthy index and the ratio of root to shoot both in two cooled-beds were apparently higher than control. Water-cooled seedling bed was an effective way to lower the root-zone temperature and it could improve tomato seedling growth during hot summer. The M-type cooled-bed was more beneficial to enhance the growth of tomato seedlings.

Key words: Tomato, Root-zone cooling, Plug seedlings, High temperature duration, Healthy index

LI Sheng-li, NIU Xu-xu, SUN Zhi-qiang. Root-zone Cooling Effect of Different Water-cooled Seedling Bed and Its Effect on the Growth of Tomato Plug Seedlings[J]. Chinese Journal of Agrometeorology, 2016, 37(01): 19-25.

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