化肥减量配施腐殖酸对烤烟生长、产量和品质的影响OA

To investigate the effects of the combined application of chemical fertilizer and humic acid on the yield and quality of flue-cured tobacco,we used K326 as the experimental material in this study,and a field experiment was conducted in the tobacco-planting region in Chuxiong,Yunnan Province.The effects of five levels of chemical fertilizer(G0:conventional chemical fertilizer application rate;G1:reduced application rate of G0 by 15%;G2:reduced application rate of G0 by 30%;G3:reduced application rate of G0 by 45%;G4:no fertilizer application)and two levels of humic acid(H1:humic acid mainly applied as foliar fertilizer;H0:equal amount of water without humic acid)on plant phenotypic traits,tobacco chemical indexes,tobacco yield and its production value were analyzed.The results showed that the amount of conventional fertilizer applied to tobacco in Chuxiong exceeded the nutrient demand of the plants,as reducing the amount of conventional fertilizer by 15%-30%had no significant effect on the yield and production value of tobacco leaves.Compared with the treatment of water,applying humic acid(H1)increased the maximum leaf length,maximum leaf width and number of leaves;increased the nicotine content but decreased the total sugar content of the leaves.Furthermore,the yield,average price and production value of tobacco grown under H1 were increased by 6.60%,5.26%and 11.68%,respectively,compared with those grown under H0.Overall,there were no significant interactions between the effects of chemical fertilizer application rate and humic acid on the phenotypic characters,yield and production value of tobacco leaves.Therefore,reducing 15%-30%of the conventional chemical fertilization rate and applying extra humic acid could increase the yield and production value of tobacco leaves if tobacco is planted in the Chuxiong tobacco-growing area of Yunnan Province.