春季少雨和多雨年份花前施肥对芒果开花和结果影响初报OA

To investigate the effect and suitable fertilization formula of fertilization before flow-ering on mango flowering,fruit setting and yield in spring of low-and high-rainfall years,a field ex-periment was conducted in spring of the low-rainfall year(2018)and the high-rainfall year(2019)to investigate the effects of 5 treatments of fertilization before flowering(F0:compound fertilizer 0.5 kg/plant;F1:compound fertilizer 0.25 kg/plant + chicken manure 2.5 kg/plant;F2:chicken ma-nure 2.5 kg/plant;F3:compound fertilizer 0.5 kg/plant + K2SO4 0.25 kg/plant+ urea 0.25 kg/plant;F4:compound fertilizer 0.5 kg/plant + K2SO4 0.25 kg/plant)on mango flowering,fruit setting and yield in fixed locations of the same orchard.Results showed that:in the spring of low-rainfall year(2018),the change of flowering rate was not significant and the highest flowering rate was found in F3 or F4;the highest fruit setting rate was found in F1 and the second highest in F4 but with just a little differ-ence between F4 and F3;yield of F3 and F4 were the top two and significantly different from other treatments.In spring of high-rainfall year(2019),the flowering rate differed greatly among the treat-ments,F4 had highest flowering rate and F3 the lowest;F4 had highest fruit setting rate and F3 had the third;F4 could significantly increase the yield,while F3 significantly decreased the yield.The effects of different formulas of fertilization before flowering on mango flowering,fruit setting and yield were significantly different in spring of low-and high-rainfall years.Therefore,the most recom-mended formula of fertilization before flowering is F3(compound fertilizer 0.5 kg/plant + K2SO4 0.25 kg/plant+ urea 0.25 kg/plant)in spring of low-rainfall years,which is adding urea when applying compound fertilizer+K2SO4;F4(compound fertilizer 0.5 kg/plant + K2SO4 0.25 kg/plant)in spring of high-rainfall years but F3(compound fertilizer 0.5 kg/plant + K2SO4 0.25 kg/plant+ urea 0.25 kg/plant)is the least recommended,which is just applying compound fertilizer+K2SO4 without urea.