Recommendation of the Amount of Nitrogen Top Dressing based on Soil Nitrate Nitrogen Content for Leaf Perilla (Perilla frutescens) under the Plastic Film House
2011
Kang, S.S., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Lee, J.Y., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Sung, J.K., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Gong, H.Y., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Jung, H.J., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Park, C.H., National Institute of Crop Science, RDA, Miryang, Republic of Korea | Yun, Y.U., Chungcheongnamdo Agricultural Research and Extension Services, Yesan, Republic of Korea | Kim, M.S., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Kim, Y.H., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea
This study was conducted to recommend nitrogen (N) top dressing based on soil nitrate content for leaf perilla under forcing culture in Gumsan-gun and Milyang-si. Experimental design was the randomized complete block design for five N fertilization levels and conventional fertilization. Dry weight, nitrogen uptake, and the node number of leaf perilla were measured and soil nitrate contents were analyzed monthly. The amount of nitrogen uptake for growth of a node with two leaves was 2.2 kg 10a-¹ for Gumsan site and 3.5 kg 10a-¹ for Milyang site. Lower level of soil nitrate N concentration for standard N fertilization was determined as 10 mg kg-¹ for both sites. Soil depth, bulk density, utilization rate of soil nitrate N, and the amount of N uptake for growth of a node with two leaves were considered for calculation of upper level of soil nitrate N concentration. The upper levels of soil nitrate N concentration for no N fertilization were determined as 30 mg kg-¹ for Gumsan site and as 40 mg kg-¹ for Milyang site. Consequently the recommendation equations for the N top dressing were Y=-0.157X+4.71 for Gumsan site and Y=-0.1667X+6.6667 for Milyang site.
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