Estimation of Nitrogen Fertilizer Recommendations for cucumber by Soil Incorporation of Rye Based on Soil Nitrate Nitrogen Content
2018
Lim, T.J., Rural Development Administration, Jeonju, Republic of Korea | Park, J.M., National Institute of Horticultural and Herbal Science, Wanju, Republic of Korea | Lee, S.E., National Institute of Horticultural and Herbal Science, Wanju, Republic of Korea
In this study, we estimated the appropriate nitrogen (N) recommendations of cucumber by evaluating the effects of soil incorporation of rye (Secale cereal L.) as a green manure crops on the growth and yield of cucumber under the greenhouse condition showing two different soil nitrate N levels. One, soil nitrate-N content before the experiment was 60 mg kg-¹, carried out in 2012 and the other showing a 227 mg kg-¹ level was conducted in 2013. Six different N treatments were used as follows: No N fertilizer, rye, rye with urea 0.5 N, 0.75 N, and 1.0 N, and urea 1.0 N. The amount of N supply from soil incorporation of rye was 146 kg ha-¹ in 2012 and 107 kg ha-¹ in 2013. When soil nitrate N content before the experiment was 60 mg kg-¹, the growth and yield of cucumber did not differ between the rye + urea 0.5 N and the urea 1.0 N, which can reduce 50% of N fertilizer recommendation. In case of soil nitrate N content before the experiment was 227 mg kg-1 or beyond, no N fertilization can be recommended because there were no significant differences in the growth and yield of cucumber among all treatments including the rye. Lastly, when soil nitrate N content before the experiment was within range of 227 - 60 mg kg-¹, N recommendations can be calculated through the equation Y = -3.34X + 227 (X: % of N recommendations, Y: soil nitrate N content). However, further studies on the relationship between soil nitrate N content and yield of cucumber are required.
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