Effect Of Seedling Age And Area Of Nutrition And Chemical Regulation On Seedling Quality Of Broccoli

In the northern areas,because of the increasing use of plastic greenhouses and solar greenhouses,the demand for seedlings has also increased,while some prominent problems have emerged.For the cost of breeding and environmental reasons,common seedling broccoli difficult phenomenon,when the continuous overcast and rainy and high temperature and high humidity weather conditions,broccoli hypocotyl seedling growth may occur due to the phenomenon;relevance,age and nutritive area of seedling age,nutrition area of nutrient deficiency,resulting in decreased quality of seedling.Chemical regulation reasonable and suitable nutrition area is to solve the problem of leggy seedlings.Based on the "Olympic Green No.two" as the test material,aims to study the application of plant growth regulator control and provide a theoretical basis for the growth of young seedling of broccoli seedling.1.broccoli seedling leaf area and seedling age on the growth and development.This study shows that the "green Olympic two as tested material,three kinds of specifications of tray with 72,105,128 holes,large,medium and small set(25 days,30 days,35 days)three seedling age stage,effects of different treatments on growth of broccoli seedlings of this experiment is to,selected suitable for seedling tray specifications.Experiments show that the number of holes represents a constant area,providing nutrient supply for their growth and development.The effect of leaf area and seedling age on the growth and development of broccoli seedling,performance with increasing nutrient area,strengthen the inhibiting effect on plant nutrition area.Therefore,we should consider the demand of plant nutrient area,and consider the market demand in order to achieve the balance between economic efficiency and quality.The experiment showed that the broccoli seedling period,using 128 hole tray in the small seedling stage,using 105 hole tray in the seedling period,the seedlings period using 72 hole plate.2.broccoli seedling chemical regulation technology.With the concentration change of bottom water irrigated with different concentrations of chlormequat and mepiquat,in terms of agronomic traits,plant height was decreased,the stem diameter,stem fresh weight and leaf area,G value,root shoot ratio,seedling index etc.are increased.That began to inhibit the growth of aboveground part of the irrigation in early,promote root growth,in the late growth stage of seedling,root nutrient accumulation begins on the part of transport,in under the action of hormones,promote stem lateral growth.Gather more photosynthetic products on physiological and biochemical characteristics,root activity enhanced,enhanced enzyme activity,which play a role in seedling.The results show that in a certain concentration range,with the changes of growth inhibitor concentration,when the CCC concentration reached 400mg/L,DPC 75mg/L,seedling index of broccoli seedling is the best treatment effect,yield,compared with the control,the yield increased.