| Effects of nitrogen deficiency stage and nitrogen application period on dry matter and nitrogen accumulation of oil flax |
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| DOI：10.7606/j.issn.1000-7601.2021.05.05 |
| Key Words: nitrogen deficiency stage nitrogen application period oil flax dry matter accumulation nitrogen accumulation yield |
| Author Name | Affiliation | | GUO Lizhuo | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Lab of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | YANG Bo | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Longnan Agricultural Technology Extension Station, Wudu, Gansu 746000, China | | GAO Yuhong | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Lab of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | NIU Junyi | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Lab of Arid Land Crop Science, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Sand culture pot experiment and soil culture pot experiment were conducted to study the effects of nitrogen (N) deficiency stage and N fertilizer application period on dry matter accumulation, N accumulation and yield of oil flax. Six N supply or deficiency stage treatments and six N ratio treatments of base fertilizer to top dressing were set up in sand culture and soil culture, respectively. The results showed that, compared with normal N supply during the whole growth period (CK), the inhibition of dry matter accumulation caused by N deficiency in sowing\|fir shape stage (T1) gradually decreased with the continuous N resupplying after fir shape stage, and the dry weight of stems and leaves eventually produced equal compensation at maturity, while N deficiency in stage of fir shape~budding (T2), budding~blooming (T3), blooming~mature (T4), and budding~mature (T5) decreased the dry matter accumulation of all organs. When compared with CK, the grain yield of T1, T2, T3, T4, and T5 reduced by 18.02%, 26.54%, 35.06%, 38.83%, and 48.00%, respectively. Ensuring N nutrient supply in reproductive growth stage avoided about 35%~50% yield loss. Under the same N fertilizer dosage of 0.2 g·kg-1 soil, more than 2/3 amount of basal fertilizer was not conducive to improving N nutrition and plant growth. Applying basal fertilizer less than 1/2, with the remaining fertilizer top dressed once or twice in fir\|shaped or budding stage increased total N and dry matter accumulation of flax plant by 10.71%~37.50% and 9.34%~22.02%, respectively. The 1/6 basal fertilizer + 1/3 top dressing in fir shape stage + 1/2 top dressing in budding increased N and dry matter accumulation, grain yield by 7.17%~37.50%, 7.89%~22.02%, and 9.59%~26.71%, respectively, compared with other fertilizing methods (i.e. 100% basal fertilizer, 2/3 basal fertilizer + 1/3 top dressing in budding, 1/2 basal fertilizer + 1/2 top dressing in budding, 1/6 basal fertilizer + 5/6 top dressing in fir shape stage). In summary, N deficiency in blooming to maturity stage was the most sensitive to dry matter accumulation inhibition and yield decrease, and top dressing before and after budding had a significant compensation effect. Applying basal fertilizer less than 1/3, with the remaining fertilizer top dressed twice in fir shape stage (or branching stage) and budding stage, and making more than 1/2 top dressing in budding was a more reasonable N applying method for oil flax. |
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