| Effects of different water nitrogen couplings on dry matter accumulation, nitrogen uptake and yield of summer soybean |
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| DOI：10.7606/j.issn.1000-7601.2016.05.12 |
| Key Words: water nitrogen coupling drip irrigation summer soybean dry matter nitrogen use efficiency yield |
| Author Name | Affiliation | | LI Ya-jie | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | XU Wen-xiu | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHANG Na | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | SU Li-li | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHANG Yong-qiang | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | TANG Jiang-hua | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | HAO Wei-wei | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| In order to study the effects of different water-nitrogen couplings on dry matter accumulation, nitrogen uptake and yield of summer soybean, a field experiment was conducted based on a two factors split plot experiment in Yining County from the July to October. For the split plot design, the irrigation factor was assigned to the main plot with 4 irrigation levels as 3 000 m3·hm-2 (W1), 3 600 m3·hm-2 (W2), 4 200 m3·hm-2 (W3) and 4 800 m3·hm-2 (W4), and the nitrogen factor to the subplot with 3 nitrogen levels as 0 kg·hm-2 (N0), 150 kg·hm-2 (N1) and 300 kg·hm-2 (N2). The results showed that with the increase of irrigation quantity, the average increase rate of dry matter (Va), the continued days of dry matter accumulation (T) and nitrogen uptake were all presented a trend of being increased first then becoming decreased, reaching the maximum by W3. Under the condition of the nitrogen input increased at low water (W1), the dry matter accumulation, nitrogen uptake and yield were also increased while the nitrogen use efficiency became reduced. Under sufficient soil water condition, increasing the application of nitrogen elevated dry matter accumulation, nitrogen uptake and nitrogen use efficiency, and excessive nitrogen was not favorable to root absorption of nitrogen, which adversely decreased the nitrogen use efficiency. In a word, the treatment of W3N1 had the highest dry matter accumulation, nitrogen uptake and yield (3 741.23 kg·hm-2), 54.30% and 17.02% in yield higher than those of W1N0 and W4N2, respectively. |
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