The Study On Growth Regularity Of Above-ground Organs Of Confection Sunflower

This experiment selected edible sunflower LD-500、RH-6009、RH-118variety as materials, each variety selected five as observed samples. To the observation of the sunflower growing season’s leaf、stem diameter、plant high、form of faceplate and grain filling process and regular data measurement,the results indicate:According to the leaf function period, edible sunflower whole beads leaf can divided into three groups:less of50day9base leaf in the leaf function period classified as first group, leaf area per day increment:34.09cm2; Above50day the10～22th leaf in the leaf function period classified as second group, leaf area greater than400cm2,per day increment:162.61cm2, account the total leaf area70%; Less of50day the23th leaf function period classified as third group, per day increment:53.84cm2.The whole bead leaves need66day from the first leaves leaf to the last leaf forming until stop to growing,every leaves leaf to forming until stop to growing need about average15～27days; The critical period of growth is the39～57th day after the emergence, the speed growth is faster, per day increment can reach333.72cm2,the growth account total leaf area about59%in this period. Plant high growth period:from the emergence to plant high forming until stop to growing need about63days, the critical period of growth is the30～45th day after the leaves leaf, per day increment can reach5.2cm,growth account total plant high42%in this moment, growth dynamic in accordance with Logistic model. The rough growing period:from emergence to rough forming until stop to growing need60days, the critical period of rough growing is the21～42th day after emergence, per day growth can reach0.07cm,growth account total stem diameter about83%,growth dynamic in accordance with logarithmic function curve. The faceplate growing period:from squaring to disc diameter forming until stop to growing need48days, the critical period of growth:the63～81th day after emergence, per day increment can reach0.5cm,account the total disc diameter about53%,growth dynamic in accordance with cubic curve functions. Grain filling stage is emergence to mature need45days, the growth of fresh and dry weight in accordance with cubic curve functions.The influence of sunflower plant high、stem diameter、diameter faceplate and kernel weight to yield is successively:plant high> diameter faceplate> kernel weight> stem diameter.The influence of sunflower leaf area、number of leaves、kernel weight to yield is successively:leaf area> number of leaves> kernel weight.