| In this experiment,Hemerocallis citrina Baroni "dawuzui" was used as the experimental material.Through the field drip irrigation experiment of water and fertilizer integration,the farmer’s own drip irrigation and fertilization method was used as the control CK(3150m3/hm2,750kg/hm2).In order to find out the most suitable amount of drip irrigation and fertilizer,three gradually increasing irrigation quotas(2500m3/hm2,3000m3/hm2)were set.The results showed that there were three increasing fertilization quotas(450kg/hm2,675kg/hm2,900kg/hm2).The soil water content and physiological growth(plant height,leaf number,Number of stalks,etc.)of Hemerocallis citrina Baroni in the experimental area were measured regularly.Finally,the most suitable drip irrigation system of Hemerocallis citrina Baroni in the Middle Arid Zone of Ningxia was determined by yield.The growth indexes closely related to yield were analyzed by correlation,principal component and grey correlation method.The main conclusions are as follows:1.Under different planting density,the survival rate,leaf number,flower bolt number and yield of daylily were significantly different.With the increase of planting density,the survival rate and the number of flower stems of day lily first increased and then decreased,the number of leaves gradually decreased,and the yield of day lily first increased and then decreased;the rate of bud dropping gradually increased;too high planting density would inhibit the increase of leaves,flower stems and yield.2.Compared with CK,under different irrigation quota treatments,the change trend of soil moisture content is basically the same:the moisture content before irrigation is low,and the moisture content gradually increases after irrigation and gradually decreases to a lower level within a few days after irrigation.As the irrigation quota increases,the soil moisture content of each layer increases.Under different irrigation quota treatments,the soil moisture content showed a trend of first increasing,then decreasing,and then increasing from the surface layer to the deep layer.3.Under the condition of drip irrigation with different water and fertilizer combinations,daylily stem thickness,number of leaves,leaf chlorophyll content,number of stalks,flower length,single flower weight,and yield are significantly different.Too high and too low water and fertilizer combinations are not conducive to Plant growth and development and yield formation.Compared with the control(CK),except for W1F1(low water and low fertilizer)and W1F2(low water fertilizer),the other treatments all achieved the effect of increasing yield to a certain extent Among them,the W2F2 treatment(irrigation quota is 3000m2/hm2,fertilization quota is 750kg/hm2)flower bud yield increased by 27.95%,and the yield increase effect was the most significant.4.Correlation analysis indicated that there was a obviously positive relationship between the amount of flower stems and yield;principal component analysis showed that principal component 1 mainly included the number of flower stems,flower diameter,single flower weight and other growth indicators,which accounted for 62.56%of the yield,and principal component 2 was stem diameter,which accounted for 22.66%of the yield.The cumulative contribution rate of the above two principal components reached 85.22%,which could represent the main growth factors affecting the yield.Grey correlation analysis showed that the fresh weight of flower bud was most closely related to the number of flower stems,stem diameter and flower length,and the order of correlation degree was:number of flower stems>length of flower>stem diameter. |
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