氮密互作对园林菊花生长及养分吸收的影响OA

In view of the problem that high-efficiency and high-yield cultivation techniques cannot be achieved in the process of artificial cultivation of garden chrysanthemum,this paper aimed to study the effects of nitrogen concentration and planting density on the growth and nutrient absorption of garden chrysanthemum,in order to provide theoretical basis for high-efficiency and high-yield cultivation of garden chrysanthemum.In this study,the nutrient solution was irrigated once every 15 days after transplanting,and the nutrient solution was irrigated five times in total.Three levels of nitrogen application rates of single plant were 200,500 and 800 mg/L(N1,N2,N3)and two levels of planting density(plont spacing×row spacing)were 40 cm×40 cm and 30 cm×40 cm(M1、M2),respectively.The main effects and interaction effects of nitrogen application rate and planting density on the growth and nutrient absorption of garden chrysanthemum were studied by measuring the growth indexes,flower quality,nitrogen absorption and change of garden chrysanthemum at different growth stages.The results showed that nitrogen application rate and planting density had significant effects on the growth and nutrient absorption of garden chrysanthemum,and there was an interaction effect between them.At 90 d after planting,the interaction of nitrogen application rate and planting density significantly regulated the plant height,stem diameter,leaf fresh weight,stem fresh weight,flower fresh weight and flower dry weight of garden chrysanthemum plants,and the growth indexes and flower quality of garden chrysanthemum plants under N3M1 treatment were significantly better than other treatments.Throughout the growth and development process of garden chrysanthemum,the effect of nitrogen application rate on the growth index of chrysanthemum was greater than that of planting density.Under the same planting density,chrysanthemum growth index,flower quality and nitrogen uptake were significantly positively correlated with nitrogen application rate.Considering the growth index,flower quality and nitrogen absorption of garden chrysanthemum,the nitrogen concentration of 800 mg/L and the planting density of 40 cm×40 cm(N3M1)could be used as the recommended nitrogen concentration and planting density in the artificial cultivation of garden chrysanthemum in the future.