On the way to fossil - free greenhouse horticulture , the availableness of fogy CO2 is lessen and ( external ) CO2 becomes a price item . The first step to dole out with this is to see how CO2 can be used more expeditiously . During the workshop of Peter Geelen at the EnergiekEvent on 11 April , a number of suggestions and approaches from Next genesis Growing were position out . Less ventilation lossesThe most obvious step is to limit losses through the vents . This can easily be figure by using the calculation putz .
ground on outside status of 700 watt / m2 irradiation , 18 ° C , 60 % RH , 400 ppm CO2 , and in the nursery 20 ° speed of light , 70 % RH and 600 ppm CO2 it turns out that 630 kilo CO2 / ha.hr is discharged through the vents . By increasing the glasshouse temperature to 24 ° C , the ventilation loss decreases to 250 kg / ha.hr . And if the RH also uprise to 85 % , the ventilation release of CO2 is further reduce to 185 kilo / ha.hr . This is due to the fact that the ventilation stop number put down from 170 to 68 and 50 m3 / m2.hr .
decrease the ventilation speed is easier with diffuse light , ceiling sprinkling and / or fogging . Fogging in particular is , harmonize to Peter , a powerful prick in the future tense to operate with less CO2 stimulant . " The ventilation losses can be reduce to zero by lower the CO2 layer in the greenhouse to the note value out of doors . Depending on the shaft of light , concession will be made to an optimal plant maturation . "
have the plant life use CO2 more efficientlyFirst of all , of course of action the plant can handle CO2 more efficiently as the stomate are unresolved better when exposed to radiation therapy . To achieve this , good irrigation is important . A constant plant balance insure a incessant radical ontogenesis and prevents stem necrosis , which mean water stress . When gamey irradiation is come with by a sufficiently high air humidity , the harvest can better manage the water remainder so that the stomata stay open more and longer .
When more CO2 is usable for the craw that subsequently can be absorbed better , this will result in more production of assimilates . To also commute this into more increase , the temperature , CO2 dependant , must be raise . Less airing therefore not only leads to less respiration red ink , but also to a more efficient use of CO2 by the crop .
This cultivation strategy with less ventilation can be further fortify by growing with a ‘ low ’ sump size , leading to a lower plant load in the form of fewer fruits , flower or plants per m2 , according to Peter .
CO2 dosageLight - dependent CO2 dosing also increases the efficiency . The photosynthesis speed bet on the level of the radiotherapy . So the demand for CO2 also depend on the amount of light . A command that pee the target value for ppm CO2 dependent on the irradiation ( watts / m2 ) can be used for this . To optimize the availability of CO2 around the leaf , we can also cerebrate of sufficient aura front around the folio and dosing CO2 in the head of the crop , Peter tot up .
With beat that limit ventilation losses , have the crop deal CO2 more efficiently and make the dosing method more effective , CO2 can be used more efficiently , according to Peter . " Then even less CO2 in cultivation choke together with undecomposed increment . No investments are postulate for this and you may start with it today . "
origin : Kas als Energiebron
