Hydroponically raised seedlings and transplanting techniques for paddy rice with long-mat in cold regions
2007
Osato, T.(Iwate-ken. Agricultural Research Center, Kitakami (Japan)) | Ito, K. | Takahashi, O. | Oikawa, A. | Takahashi, Y. | Maeyama, K. | Fujii, T. | Odanaka, A. | Tsuruta, M. | Goto, J.
The long-mat system developed by the National Agricultural Research Center as a stable and laborsaving technology for paddy rice production was systematized for cold regions. In cold areas like Iwate Prefecture, it is possible to raise seedlings in 15-17 days by warming the seedlings in the initial stages of development and then subsequently maintaining the daily water temperature 150 deg C and above. By adding additional fertilizer 3 days earlier than being rolled up, nitrogen concentration of the rice seedlings increases and rooting is promoted, stabilizing early growth stages. The rolled-up seedlings can be stored for approximately 7 days. A seedling press device was attached to a conventional rice transplanter to transplant the seedlings, which resulted in fewer number of missing hills and damaged seedlings and a working capacity of 2.3-3.0 hours per hectare. Therefore by combining these technologies, the nursery device can be used twice from mid-April through sowing and temperature control, and fertilizer management, making a 4.8 hectare-scale systematized technological operation possible. Additionally, labor productivity (per time income) is increased, as the raising and transplanting of seedlings require less effort and the total labor time is cut down.
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