Effects of Different Irrigation and Fertilization Rates on the Growth,Yield and Quality of Fennel

QI Tiancheng; LI Yinghai; LI Yangyang

doi:10.15933/j.cnki.1004-3268.2025.01.007

Abstract：In order to explore the effects of different irrigation and fertilization rates on the growth and development,yield composition and quality of fennel,three irrigation quotas(1 800,3 000,4 200 m3/ha),three irrigation times(2,3,4 times)and three fertilization levels(270,450,630 kg/ha)were set.Orthogonal experiment was used to design 9 treatments to determine the growth,production and commodity indexes of fennel.The influences of the three factors on fennel growth,yield and quality were studied by range and variance analysis.The principal component analysis was used to select representative principal components and the membership function method was used to comprehensively evaluate the 9 treatments.The results showed that there were significant differences in the growth characters,yield composition and quality of fennel under different treatments.The influencing order of the three factors was irrigation quota＞irrigation times＞fertilization amount.There was a certain correlation between different indexes,and the correlation coefficient between the number of flowers and the yield per plant was 0.99.The top three treatments from high to low according to the comprehensive evaluation values were treatment 9(4 200 m3/ha,4 times,450 kg/ha),treatment 3(1 800m3/ha,4 times,630 kg/ha)and treatment 6(3 000 m3/ha,4 times,270 kg/ha).The yield of treatment 9 was 3 728.25 kg/ha,53.98％significantly higher than that of treatment 1(1 800 m3/ha,2 times,270 kg/ha),and the comprehensive evaluation value reached 0.837.The content of essential oil in treatment 3 was the highest,being 43.70 g/kg;The plant height of treatment 6 was the highest,being 131.53 cm.In conclusion,the optimal irrigation and fertilization mode for fennel in Ningxia is irrigation quota of 4 200 m3/ha,irrigation time of 4 times(once in growth period,twice in flowering period and once in fruit setting period),fertilizer application amount of 450 kg/ha(once in growth period and once in flowering period).