| Quinoa is affected by many factors during the growth period,and moisture and nitrogen fertilizer played a vital role.The nutrient uptake and water and nitrogen use efficiency in the growth of quinoa were studied with pot experiment in greenhouse,and the appropriate coupling input of water and nitrogen will be provided.The results are as follows:1.Different water-nitrogen coupling significantly affected the development of Quinoa.Under the same irrigation condition,the growth of Quinoa without N0 were the worst,plant height,stem diameter,SPAD and dry matter accumulation were lower than those of N3 and N4.Under the same nitrogen application condition,the average of all treatments under W2 irrigation condition was higher than that under W1 and W3irrigation condition,the maximum accumulation amounts of plant height,stem diameter,SPAD and dry matter of Quinoa were W2N4,W2N3,W2N4 and W2N3,respectively.W2N1～W2N4 compared with W2N0 all those items increased by 197.93%,67.75%,51.26%,619.79%at maturity.2.Different water-nitrogen coupling significantly affected the yield of quinoa.During the growth period of quinoa,under the same irrigation,the grain weight per plant of quinoa increased first and then decreased with the increasing of nitrogen fertilizer.The grain weight of per plant was the largest in N3 treatment in this experiment.N1～N4 were75.41%,73.08%,72.02%higher than that of N0 treatment.,respectively.Under the same nitrogen application level,the grain weight per plant was W2>W3>W1.Above all,the grain weight of per plant was the highest at W2N3 treatment.3.The water-nitrogen coupling significantly affected the physiological characteristics of quinoa.Under the same irrigation conditions,the soluble protein and nitrate reductase of leaves treated with N1～N4 were higher than that of N0,and the maximum value was achieved at N3 or N4 treatment.The content of SOD and POD in leaves of N1～N4 quinoa were lower than that of N0,and the minimum value was reached at N3.At maturity,the content of soluble protein and NR in leaves were W2>W3>W1,SOD and POD in quinoa leaves were W2<W3<W1.The physiological characteristics of W2N3 treatment were the best under the interaction of irrigation conditions and N application.4.The water-nitrogen coupling significantly affected the accumulation of nutrients（N,P,K）in quinoa.The accumulation of N,P and K increased within the growth period.Under the same level of nitrogen application,the overall accumulation of nitrogen,phosphorus,and potassium showed that the W2 irrigation treatment was greater than those of W1,W3,Under the condition of W2 irrigation at maturity period,the accumulation of N,P,K in quinoa reached the maximum level was N3.Under the interaction of irrigation condition and nitrogen application rate,the accumulation of N,P,K in Quinoa increasing 13.27 times,5.53times and 5.29 times than that of N0 at W2N3.The accumulation of N,P and K at W2N3 treatment was the highest under the interaction of irrigation condition and N application rate.5.The water-nitrogen coupling significantly affected the water and nitrogen utilization of quinoa.The nitrogen use efficiency was the highest were N1,N3 and N3,which were35.13%,37.04%and 34.60%,respectively.the water consumption and water use efficiency of N1～N4treatment were higher than N0.With the increasing of nitrogen fertilizer,The water use efficiency increased at first and then decreased with the increase of application rate,and the nitrogen application level reached the highest value at N3.N3 increased by 64.79%,70.42%and 66.10%,respectively.Under the same nitrogen application level,the overall performance of W2 is greater than those of W1 and W3.The nitrogen utilization rate and water utilization rate of W2N3 treatment were the highest under the interaction of irrigation conditions and nitrogen application.Above all,the suitable irrigation condition for quinoa growth was W2N3 in this research(W2=60%field water holding capacity,N3=112.5kg·hm-2). |
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