Chrysanthemums are a clear - loving crop that can be sore to too much heat . Advisor Paul de Veld explains the choice of coatings and the sphere ’s trends .
Paul de Veld is a Senior adviser at Delphy and specializes in chrysanthemums . One of his customer grows the compact Santini variant , which has various varieties . ‘ This caller grow a variety that is sensitive to vegetal emergence when there is too much radiation and too much heat . This slows down flower bud maturation and resultant role in secondary growth : the side shoots near the flower start to produce . This effect especially happens when temperatures are too high during bud ontogeny during inadequate - daylight intervention , ’ he says .
Because the crop needs a short day for bud development . During that period the smuggled - out drape is close up more than half the time every 24 hours . During the summer , the temperature below the pall becomes quite high . A coating can then help keep the 24 - hr temperature down , which results in a depleted temperature during the day . In addition , the temperature below the curtain stays lower when the sun still shines on it .
De Veld : ‘ We already hash out the strategy in the bound . We then list our expectation for the relevant variety and what our experience was in the late twelvemonth . Besides the problems with vegetative growth , the flower ’s color in some variety slicing when it is raging . Then we assess which coating would be most efficient in harness the problems . ’
The right choiceBasically , there are two potential coatings that can be used to contribute the temperature down : ReduHeat and ReduFuse IR . ‘ ReduFuse IR is preferred as it allows just a bit more igniter in . In increase , diffuse light is beneficial for the crop ’s growth and developing . ReduHeat would be the favorite option only when proper color ontogeny is very sensible to heating system , ’ he says .
The conclusion of the agriculturalist ’s analysis was that ReduFuse IR was the right choice . ‘ The agriculturalist has several age of experience now with this coating . you could see that the undesirable lush , vegetal growth has been eliminate and that the flower quality is skillful . Taking PAR lite measurements is not vulgar practice in chrysanthemum cultivation . This is why we are unable to quantify the effect . However , just looking at the harvest , the positive upshot of the coat is easy to see . ’
When a finishing is used , it is still possible for direct sunlight to fall on the flora through open windows . This can clearly damage a crop ’s coloring . ‘ Without a coating you would demand to shut the black - out curtain 85 - 90 % at times like this . When a coating is used 60 % is sufficient . This creates a better clime due to improved gentle wind circulation . In addition , due to the function of ReduFuse IR , the light differences below the dark - out curtain are much less , ’ he says .
Hot summersIn late years De Veld has seen an increase in the role of ReduFuse IR among his customers . This is no dubiety due to the consecutive hot summertime . Of naturally it is unimaginable to predict what the summer atmospheric condition is go to be like .
‘ This is why some people are adopting a “ wait - and - see ” approach . This means that they have to reply rapidly to the conditions forecast when the time comes . In the case of an unfavourable weather prognosis they have a professional contractor apply ReduSol , or sometimes SprayChalk , to the section of the greenhouse with the quondam crop , ’ he says .
This way flower discolor or burnt flower petal can be prevent . The most suitable coating calculate on the diversity . ‘ ReduFuse would be highly suited for varieties that experience difficulty with desiccation at high radioactivity levels after which causes the plant to droop . This is often due to the limited sum of money of stomata . These varieties have become far less popular in late years , as a termination of which chrysanthemum growers scarce choose ReduFuse any longer . ’
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