Effects of different top-dressing treatments on soil fertility,quality and yield of Binglang taro

CHEN Yaoyao; YAN Liangwen; CHEN Min; YU Jie; LIU Zhicheng; LUO Hao

doi:10.16861/j.cnki.zggc.2025.0450

Abstract：Taking the Changting white bud taro(a local cultivar of Colocasia esculenta L.)as the experimental material,a field experiment was conducted to investigate the effects of different top-dressing regimes on soil fertility and on the quality and yield of the mother corm.Four top-dressing treatments(CK,T1,T2 and T3)were designed and applied in two splits in June and July.For every treatment,the conventional compound fertiliser rate per application was reduced from 50 kg·667 m-2(CK)to 35 kg·667 m-2,on this basis,T1,T2 and T3 were supplemented with high-efficiency water-soluble fertiliser,specialty bio-functional fertilisers(microbial inoculants,amino acids or chitosan)and micronutrients,respectively.Compared with CK,T1,T2 and T3 all increased the content of soil available nutrients and organic matter and enhanced soil enzyme activity to varying degrees.All three modified regimes improved the quality indices of the mother corm,with T1 giving the most pronounced enhancement,for the 13 quality parameters determined,T1 showed significant increases compared to CK.Correlation analysis revealed that alkali-hydrolysable N content was significantly positively correlated with four functional indices(vitamin C,amino acid,flavonoid and total phenol content),while both amylose and amylo-pectin content were significantly positively correlated with available P,available K,alkali-hydrolysable N,organic-matter content and soil pH.Compared to CK,T1,T2 and T3 markedly raised the taro yield and economic benefit.Under the same basal-fertiliser input,comprehensive evaluation of soil fertility,corm quality and yield indicated that the optimum top-dressing strategy for the seedling-strengthening and corm-enlargement stages of taro production in western Fujian is T1 treatment:30%reduction of compound fertiliser,supplemented at the first top-dressing with 2.5 kg·667 m-2 Zhixin high-K water-soluble fertiliser,500 mL·667 m-2 Woyiduo microbial inoculant,100 g·667m-2 micro-granular boron and 500 mL·667 m-² Wojiafu,and at the second top-dressing with 2.5 kg·667 m-2 Zhixin high-K water-soluble fertiliser,500 mL·667 m-2 Woyiduo microbial inoculant,1 kg·667 m-2 chitosan and 100 g·667 m-2 micro-granular boron.