| Hemerocallis citrina Baroni is one of the key industries that vigorously developed in Yanchi County,Ningxia,but the area has little drought and little rainfall,large evaporation,and blindness in irrigation and fertilization by farmers,which seriously restricts the development of the local Hemerocallis citrina Baroni industry.Therefore,the optimization of the irrigation system in this area is an inevitable choice for the development of Hemerocallis citrina Baroni’s production.In this experiment,taking the Gansu Dawuzui as the research variety,through field experiments,the effects of different water and fertilizer treatments on the growth,yield and net income of 3a and 4a raw Hemerocallis citrina Baroni were studied,and the optimal water and fertilizer applicable amount of 3a and 4a raw Hemerocallis citrina Baroni was determined,in order to provide theoretical basis and technical support for the Hemerocallis citrina Baroni industry in Yanchi County,Ningxia.1.Aiming at the problem of the optimal water and fertilizer requirements of 3a raw Hemerocallis citrina Baroni,this experiment showed that the soluble sugar content and yield of 3a raw Hemerocallis citrina Baroni increased first and then decreased with the increase of irrigation quota and fertilization amount,and the protein content increased first and then decreased with the increase of irrigation quota,but increased all the time with the increase of fertilization amount.The regression analysis showed that when the maximum fresh weight yield was 16064.6kg/hm2,the required water and fertilizer were 3313.5m3/hm2 and 707.8kg/hm2,respectively;when the maximum soluble sugar content was 50.7%,the required water and fertilizer were 2937.8m3/hm2 and 702.7kg/hm2,respectively.However,the fresh weight yield and soluble sugar content of 3a raw Hemerocallis citrina Baroni were difficult to reach the maximum at the same time,and they had different dimensions.Therefore,based on the yield and quality indexes of 3a raw Hemerocallis citrina Baroni,the optimal water and fertilizer combinations of 2752.6 m3/hm2 and 656.0 kg/hm2 were obtained by normalizing and the likelihood function combination method.2.Aiming at the problem of suitable irrigation quota and water demand law of 4a raw Hemerocallis citrina Baroni,this experiment showed that under the condition of flat water year,the irrigation system of the W3 treatment group of 4a raw Hemerocallis citrina Baroni was more reasonable,and when the single irrigation water was 300m3/hm2,it was more conducive to the growth of Hemerocallis citrina Baroni;and the plant height,leaf width,stem diameter,the number of pumps in the 5m cell,flower length,flower diameter and fresh weight of single flower all increased first and then decreased with the increase of irrigation quota,but the number of leaves kept increasing with the increase of irrigation amount.When the irrigation quota is 3450m3/hm2,Hemerocallis citrina Baroni grows better,with the highest yield,fertilizer partial productivity and net income.Through regression analysis,when the maximum fresh weight yield of Hemerocallis citrina Baroni was 19587.0kg/hm2,the required irrigation quota was 3470.0m3/hm2;when the maximum net income was 78914.0 yuan/hm2,the required irrigation quota was 3346.0m3/hm2.3.Through the correlation analysis of growth indexes,appearance indicators and yield,it was found that there was a great correlation between the number of pumps in the 5m cell and the fresh weight yield of Hemerocallis citrina Baroni,the plant height had a great correlation with the stem diameter and leaf width,the leaf width had a greater correlation with the stem diameter,and the flower diameter had a greater correlation with the fresh weight of the single flower;the correlation analysis results showed that the number of pumps was an important indicator affecting the yield of fresh weight yield.4.Aiming at the problem of suitable fertilizer demand for 4a raw Hemerocallis citrina Baroni,this experiment showed that under the condition of flat water year,different fertilization amount had a significant effect on the growth index of 4a raw Hemerocallis citrina Baroni,and the plant height,leaf width,stem diameter,the number of pumps in the 5m cell,flower length and fresh weight of single flower of 4a raw Hemerocallis citrina Baroni all increased first and then decreased with the increase of fertilization,but the number of leaves increased with the increase of fertilization amount.When the fertilization amount is 675 kg/hm2,Hemerocallis citrina Baroni grows better,with the highest yield,fertilizer partial productivity and net income.Through regression analysis,when the maximum fresh weight yield of Hemerocallis citrina Baroni was 20033.0kg/hm2,the fertilization amount was 683.5kg/hm2;when the maximum net income was 65455.0yuan/hm2,the fertilization amount was 674.0kg/hm2. |
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