| The study of water and nitrogen coupling of oil flax, and the request for reasonable level of water and nitrogen input as well as the improvement of low rate status have important significance to improve the economic and ecological benefits of agricultural production and the current situation of agricultural production in the region. This field experiment in April 2015 to August in Gansu Province Lanzhou Yuzhong County was conducted to study the effect of different water and nitrogen treatment on the growth, dry matter accumulation and distribution, grain yield and quality as well as water use efficiency in order to obtain the optimal water and nitrogen coupling scheme and achieve water and nitrogen effective use. The main conclusions of the study are as follows:1.The different water and nitrogen coupling has a significant impact on the growth dynamics of flax. LAI showed a parabola trend from fir shaped stage to the green stage. The Full flowering stage had the strongest photosynthesis while reached the peak of accumulation and assimilation. Besides, the leaf area index was increased to a certain extent under the different irrigation and fertilization treatments, and decreased when the irrigation and nitrogen amount were exceeded 2100 m3/hm2 and 112.5 kg/hm2. The plant height was showed "s" type of trend, and the rapid growth period were fir shaped stage to squaring stage and squaring stage to flowering flax plants. The overall growth trend of plant height was not changed with different irrigation amount and nitrogen application rate, the treatment with irrigation amount of 2100 m3/hm2 and nitrogen application rate of 112.5 kg/hm2 was better able to promote the growth of plant height of flax and was processing the fastest growing.2.The dry matter accumulation rate was reached the peak at the flowering stage to the green stage, and the treatment of irrigation amount of 2100 m3/hm2 and nitrogen application rate of 112.5 kg/hm2 was best(209.76 mg) and increased by 9.55%~31.37% than other treatments. In the mature stage, the treatment with irrigation amount of 2100m3/hm2 and N application rate of 112.5 kg/hm2 in irrigation was the highest, which was higher than other treatments in 1.3%~6.09% treatment. It is indicated that the irrigation amount, 2100m3/hm2 application amount of nitrogen application rate of 112.5kg/hm2 was treatment can improve and improve flax dry matter accumulation and distribution, to lay a good foundation for the formation of high yield.3.Squaring to full flowering was the biggest stage of oil flax,Showing that the phase was one of the biggest oil flax water demanding period.The treatment of irrigation amount of 2100 m3/hm2 was the biggest,Adding water amount, oil flax soil storage water consumption reduce instead. the variation trend of water use efficiency was the highest and increased by 6.75%~18.67%(P<0.05)compared with other treatments. the treatment with irrigation amount of 2100 m3/hm2 and nitrogen application rate of 112.5kg/hm2 was the best treatment for water and nitrogen coupling of oil flax.4.Water and nitrogen coupling has played a great role in grain quality enhancement and production formation. The treatment of irrigation amount of 2100 m3/hm2 and nitrogen application rate of 112.5kg/hm was the highest production formation, increased by 16.05%~28.97%(P<0.05) compared with other treatments. Adding water amount, the W2 content of sub-oleic increased was significantly increased by 3.25% and 1.21% than W3 and W1, indicating moderated amount of irrigation can promote oil flax content of sub-oleic. For sub-oleic, W2N2 treatment increased by 0.41%~1.42%(P<0.05) compared with other treatments. So, the treatment with irrigation amount of 2100 m3/hm2 and nitrogen application rate of 112.5kg/hm2 can improve grain quality enhancement and production formation. |
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