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¿¬±¸º¸¹® : Åä¾çȯ°æ ; Áú¼Ò °üºñ·® Àý°¨ÀÌ Å丶Åä »ýÀ° ¹× ¼ö·®¿¡ ¹ÌÄ¡´Â È¿°ú
Original Research Articles : Soil Environment ; Effect of Reduced Nitrogen Fertigation Rates on Growth and Yield of Tomato |
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ÀÌÀκ¹ ( In Bog Lee ) , ÀÓÀçÇö ( Jae Hyun Lim ) , ¹ÚÁø¸é ( Jin Myeon Park ) |
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To investigate the effect of N fertigation on the growth, yield, and water and nitrogen use efficiencies during tomato cultivation, seedlings were transplanted in a sandy loam soil under plastic film house condition. 0, 88, 132, 176, 220 kg ha-1 N rates, which correspond to 0 (NF0), 40 (NF40), 60 (NF60), 80 (NF80), 100% (NF100) N level of soil test-based N fertilization, were injected weekly through drip irrigation system for 15 weeks in N fertigation system, and the control (conventional N treatment) was installed for comparison. Herein, nitrogen was applied by top-dressing with 60% as a basal and 40% as additional fertilizer. There was little different in stem diameter growth among N fertigation treatments, but plant height and dry matter increased with increasing N fertigation rates as well as in N conventional treatment. Tomato yield was increased with increasing the number of marketable fruits in N fertigation treatments, and the fruit yield was maximized in NF 80 treatment (176 kg ha-1 N supply or 96.6 mg L-1 N injection). Dry matter productivity and nitrogen uptake amount were significantly increased with increasing N fertigation rates. The ratio of fruits to the dry weight of whole plant was decreased with increasing N fertigation rates, but this ratio was 2.6~5.3% higher in N fertigation treatments than in the control. In addition, the ratios of nitrogen distributed toward fruits in N fertigation treatments were 3.7~21.7% higher than that of control. The apparent N recovery percentages showed significantly higher values as 71.8~102.3% in N fertigation treatments, compared to 45% in N conventional treatment. Water use efficiency was significantly increased by fertigation system with the maximum 361 kg/ha cm-1 in NF 80, which is comparable to 324 kg/ha cm-1 of the conventional treatment. Conclusively, N fertigation system was effective on increasing tomato productivity and nutrient efficiency as well as 20% reduction of N fertilization level.
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