| Effect of combined application of ammonium and nitrate on nutrient utilization and yield of mini Chinese cabbage |
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| DOI：10.7606/j.issn.1000-7601.2017.04.08 |
| Key Words: mini Chinese cabbage ammonium nitrate ratio root bleeding dry matter accumulation nutrient uptake |
| Author Name | Affiliation | | SU Jin-chang | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | HE Zhi-qiang | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Jie | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LU Jian | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YU Ji-hua | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Guo-bing | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| A field experiment was carried out to investigate the effect of combined application of ammonium and nitrate on the growth, nutrient utilization and yield of mini Chinese cabbage (Brassica pekinensis vs Jinchengxiahuang). Results showed that combined application of ammonium and nitrate fertilizer could increase the accumulation of dry matter in all parts of the mini Chinese cabbage in the heading stage compared with single nitrogen fertilizer. The combined application also significantly increased yield, total nitrogen, total phosphorus, total potassium content in each part of the plant treatment, nutrient use efficiency, the root bleeding intensity during every growth period. Additionally, when ratio of the ammonium and nitrate fertilizer was 7∶3, the root dry matter accumulation, NPK uptake and root bleeding intensity of the mini Chinese cabbage were significantly higher than that in single nitrogen fertilizer. The root dry matter accumulation was 2.16 g·plant-1, and NPK uptake was 5.92 g·kg-1, 4.44 g·kg-1, 6.05 g·kg-1 in the harvesting stage. The root bleeding intensity were 8.09 g·h-1 in the heading stage. When the ratio was 5∶5, yield and nitrogen use efficiency significantly increased, and the transfer of nutrients from different organs of to leaf ball was promoted. In the harvesting stage the dry matter weight, nitrogen use efficiency, economic output were 34.50 g, 6.89%, 114.16 t·hm-2. We concluded that the optimal ratio of the ammonium and nitrate fertilizer was 5∶5 to promote the mini Chinese cabbage production. |
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