Chrysanthemums are a light - do it craw that can be sore to too much rut . Advisor Paul de Veld explains the choice of coatings and the sphere ’s trends .
Paul de Veld is a Senior Consultant at Delphy and specialises in chrysanthemum . One of his customer grows the compact Santini variant , which has various varieties . " This company grows a motley that is sore to vegetative growth when there is too much actinotherapy and too much hotness . This slow down flower bud development and resultant role in secondary ontogeny : the side shoot near the heyday start to produce . This essence especially come when temperatures are too gamy during bud development during short - day treatment , " he enjoin .
Because the crop needs a unretentive sidereal day for bud development . During that catamenia the black - out pall is closed more than half the time every 24 hours . During the summertime , the temperature below the curtain becomes quite high . A finish can then assist keep the 24 - hour temperature down , which results in a lower temperature during the 24-hour interval . In addition , the temperature below the curtain stays lower when the sun still shines on it .
De Veld : " We already discuss the strategy in the spring . We then list our expectations for the relevant assortment and what our experience was in the previous class . Besides the job with vegetative emergence , the peak ’s color in some varieties fades when it is red-hot . Then we assess which program would be most effective in tackling the problem . "
The right hand choiceBasically , there are two potential coatings that can be used to bring the temperature down : ReduHeat and ReduFuse IR . " ReduFuse IR is preferred as it earmark just a bit more light in . In addition , the diffuse light is beneficial for the harvest ’s growth and development . ReduHeat would be the preferred choice only when proper colour development is very sensible to hotness , " he says .
The conclusion of the raiser ’s analysis was that ReduFuse IR was the right option . " The agriculturist has several years of experience now with this finish . you could see that the unwanted lush , vegetal increase has been eliminated and that the flush quality is secure . Taking PAR light measurements is not common recitation in chrysanthemum cultivation . This is why we are ineffectual to measure the upshot . However , just looking at the crop , the positive effect of the covering is loose to see . "
When a coating is used , it is still possible for unmediated sunlight to fall on the plants through open window . This can clearly damage a crop ’s colouring . " Without a coating you would need to shut the black - out drape 85 - 90 % at clock time like this . When a covering is used 60 % is sufficient . This make a honorable clime due to improved air circulation . In addition , due to the use of ReduFuse IR , the light differences below the black - out curtain are much less , " he says .
red-hot summersIn recent years , De Veld has see an increase in the employment of ReduFuse IR among his client . This is no doubt due to the successive hot summers . Of course it is unimaginable to predict what the summer conditions is going to be like .
" This is why some people are dramatize a “ hold off - and - see ” approach . This means that they have to respond chop-chop to the weather prognosis when the time comes . In the outcome of an unfavorable weather forecast they have a professional contractor give ReduSol , or sometimes SprayChalk , to the section of the glasshouse with the old craw , " he says .
This way flower discolouring or burnt blossom petals can be prevented . The most desirable coat depend on the diversity . " ReduFuse would be extremely suitable for varieties that experience difficulty with evaporation at high-pitched radiation storey after which cause the plant to droop . This is often due to the limited amounts of stomata . These variety have become far less popular in recent year , as a result of which chrysanthemum growers hardly choose ReduFuse anymore . "
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