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#1
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temperature & timing
Hi Everyone,With autumn/winter upon us,my first growing in the greenhouse I
have a question about how you control temp with the day or just a set amount of temp(8 hours a day, for example) regardless of daylong. -- Thanks Keith,England,UK. |
#2
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Hi Everyone,With autumn/winter upon us,my first growing in the greenhouse I
have a question about how you control temp with the daylength or just a set amount of temp(8 hours a day, for example) regardless of daylength. -- Thanks Keith,England,UK -- Thanks Keith,England,UK. "kenty ;-)" wrote in message news:1096803384.9kaoQ80nf6crr+oLz+bazg@teranews... Hi Everyone,With autumn/winter upon us,my first growing in the greenhouse I have a question about how you control temp with the day or just a set amount of temp(8 hours a day, for example) regardless of daylong. -- Thanks Keith,England,UK. |
#3
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I prescribe to the concept that one should let the heat in the greenhouse
increase only by solar gain. If you raise the temperature on gray, cloudy days, you will likely end up with leggy plants that aren't very sturdy, as they try to grow - stimulated by the heat - without the ability to conduct much photosynthesis. Set you preferred minimum nighttime temp and let nature take its course. -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Books, Artwork, and Lots of Free Info! .. "kenty ;-)" wrote in message news:1096803384.9kaoQ80nf6crr+oLz+bazg@teranews... Hi Everyone,With autumn/winter upon us,my first growing in the greenhouse I have a question about how you control temp with the day or just a set amount of temp(8 hours a day, for example) regardless of daylong. -- Thanks Keith,England,UK. |
#4
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All we try to do is knock off the extremes -- misters to keep the temp below
95F in summer, heat to 55F in winter. In between these extremes, whatever the temp happens to be is what it is. -- Kenni Judd Juno Beach Orchids http://www.jborchids.com "Ray" wrote in message ... I prescribe to the concept that one should let the heat in the greenhouse increase only by solar gain. If you raise the temperature on gray, cloudy days, you will likely end up with leggy plants that aren't very sturdy, as they try to grow - stimulated by the heat - without the ability to conduct much photosynthesis. Set you preferred minimum nighttime temp and let nature take its course. -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Books, Artwork, and Lots of Free Info! . "kenty ;-)" wrote in message news:1096803384.9kaoQ80nf6crr+oLz+bazg@teranews... Hi Everyone,With autumn/winter upon us,my first growing in the greenhouse I have a question about how you control temp with the day or just a set amount of temp(8 hours a day, for example) regardless of daylong. -- Thanks Keith,England,UK. |
#5
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On Sun, 3 Oct 2004 14:31:42 -0400, "Kenni Judd"
wrote: All we try to do is knock off the extremes -- misters to keep the temp below 95F in summer, heat to 55F in winter. In between these extremes, whatever the temp happens to be is what it is. We raise it to 65 during the day and let solar gain take it from there. Here in Co it is not unusual to have the roof vent raise in Feb. because it has gotten to 80 in the afternoon. OF course the next day it may be gray and not climb over 70. So I let the excess heat out and hope enough stays to temper the heating bill. SuE http://orchids.legolas.org/gallery/albums.php |
#6
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Thanks for the advise,i grow intermediate,what are your conditions for the
advise given? -- Thanks Keith,England,UK. "Susan Erickson" wrote in message ... On Sun, 3 Oct 2004 14:31:42 -0400, "Kenni Judd" wrote: All we try to do is knock off the extremes -- misters to keep the temp below 95F in summer, heat to 55F in winter. In between these extremes, whatever the temp happens to be is what it is. We raise it to 65 during the day and let solar gain take it from there. Here in Co it is not unusual to have the roof vent raise in Feb. because it has gotten to 80 in the afternoon. OF course the next day it may be gray and not climb over 70. So I let the excess heat out and hope enough stays to temper the heating bill. SuE http://orchids.legolas.org/gallery/albums.php |
#7
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Am I worrying to much about trying to achieve the day/night temp
difference,do you find then that in greenhouse culture there isn't prolonged temps that stay the same,i.e. 55f on cloudy days which surely if continued at this temp will do the plants harm?I suppose everyone's conditions are different so it is a case of trial and error.I am only flapping because it is my first year in the greenhouse and don't want to kill the plants.It will be a good learning curve through the months to come! -- Thanks Keith,England,UK. "kenty ;-)" wrote in message news:1096916367.xNZxdv1ek7mhKpcVSch/5A@teranews... Thanks for the advise,i grow intermediate,what are your conditions for the advise given? -- Thanks Keith,England,UK. "Susan Erickson" wrote in message ... On Sun, 3 Oct 2004 14:31:42 -0400, "Kenni Judd" wrote: All we try to do is knock off the extremes -- misters to keep the temp below 95F in summer, heat to 55F in winter. In between these extremes, whatever the temp happens to be is what it is. We raise it to 65 during the day and let solar gain take it from there. Here in Co it is not unusual to have the roof vent raise in Feb. because it has gotten to 80 in the afternoon. OF course the next day it may be gray and not climb over 70. So I let the excess heat out and hope enough stays to temper the heating bill. SuE http://orchids.legolas.org/gallery/albums.php |
#8
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Hi Keith, I grow in a g/h in S.Calif & have my heater set to go on
at 58 degrees. If there are plants that require a chill, they don't get it & or don't grow/bloom. I grow cyms outside. Were you growing indoors under lights before the G/h? -- Cheers Wendy Remove PETERPAN for email reply kenty ;-) wrote: Am I worrying to much about trying to achieve the day/night temp difference,do you find then that in greenhouse culture there isn't prolonged temps that stay the same,i.e. 55f on cloudy days which surely if continued at this temp will do the plants harm?I suppose everyone's conditions are different so it is a case of trial and error.I am only flapping because it is my first year in the greenhouse and don't want to kill the plants.It will be a good learning curve through the months to come! Thanks for the advise,i grow intermediate,what are your conditions for the advise given? -- Thanks Keith,England,UK. "Susan Erickson" wrote in message ... On Sun, 3 Oct 2004 14:31:42 -0400, "Kenni Judd" wrote: All we try to do is knock off the extremes -- misters to keep the temp below 95F in summer, heat to 55F in winter. In between these extremes, whatever the temp happens to be is what it is. We raise it to 65 during the day and let solar gain take it from there. Here in Co it is not unusual to have the roof vent raise in Feb. because it has gotten to 80 in the afternoon. OF course the next day it may be gray and not climb over 70. So I let the excess heat out and hope enough stays to temper the heating bill. SuE http://orchids.legolas.org/gallery/albums.php |
#9
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Hi Wendy,They only got natural light before,growing in the home,were ever I
could get them :-).what do you grow to that temp?So you don't raise the temp in the day without the sun help? -- Thanks Keith,England,UK. "wendy7" wrote in message news:VDh8d.122337$9Y5.65461@fed1read02... Hi Keith, I grow in a g/h in S.Calif & have my heater set to go on at 58 degrees. If there are plants that require a chill, they don't get it & or don't grow/bloom. I grow cyms outside. Were you growing indoors under lights before the G/h? -- Cheers Wendy Remove PETERPAN for email reply kenty ;-) wrote: Am I worrying to much about trying to achieve the day/night temp difference,do you find then that in greenhouse culture there isn't prolonged temps that stay the same,i.e. 55f on cloudy days which surely if continued at this temp will do the plants harm?I suppose everyone's conditions are different so it is a case of trial and error.I am only flapping because it is my first year in the greenhouse and don't want to kill the plants.It will be a good learning curve through the months to come! Thanks for the advise,i grow intermediate,what are your conditions for the advise given? -- Thanks Keith,England,UK. "Susan Erickson" wrote in message ... On Sun, 3 Oct 2004 14:31:42 -0400, "Kenni Judd" wrote: All we try to do is knock off the extremes -- misters to keep the temp below 95F in summer, heat to 55F in winter. In between these extremes, whatever the temp happens to be is what it is. We raise it to 65 during the day and let solar gain take it from there. Here in Co it is not unusual to have the roof vent raise in Feb. because it has gotten to 80 in the afternoon. OF course the next day it may be gray and not climb over 70. So I let the excess heat out and hope enough stays to temper the heating bill. SuE http://orchids.legolas.org/gallery/albums.php |
#10
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The heater is run with a thermostat so the heater will turn on any time
it gets colder. I grow just about everything Intermediate. Oh I have some heating cables for my Phals but I cant grow them too well? What kind of heating system do you have in your g/h Keith? It gets really cold in your neck of the woods right? -- Cheers Wendy Remove PETERPAN for email reply kenty ;-) wrote: Hi Wendy,They only got natural light before,growing in the home,were ever I could get them :-).what do you grow to that temp?So you don't raise the temp in the day without the sun help? Hi Keith, I grow in a g/h in S.Calif & have my heater set to go on at 58 degrees. If there are plants that require a chill, they don't get it & or don't grow/bloom. I grow cyms outside. Were you growing indoors under lights before the G/h? -- Cheers Wendy Remove PETERPAN for email reply kenty ;-) wrote: Am I worrying to much about trying to achieve the day/night temp difference,do you find then that in greenhouse culture there isn't prolonged temps that stay the same,i.e. 55f on cloudy days which surely if continued at this temp will do the plants harm?I suppose everyone's conditions are different so it is a case of trial and error.I am only flapping because it is my first year in the greenhouse and don't want to kill the plants.It will be a good learning curve through the months to come! Thanks for the advise,i grow intermediate,what are your conditions for the advise given? -- Thanks Keith,England,UK. "Susan Erickson" wrote in message ... On Sun, 3 Oct 2004 14:31:42 -0400, "Kenni Judd" wrote: All we try to do is knock off the extremes -- misters to keep the temp below 95F in summer, heat to 55F in winter. In between these extremes, whatever the temp happens to be is what it is. We raise it to 65 during the day and let solar gain take it from there. Here in Co it is not unusual to have the roof vent raise in Feb. because it has gotten to 80 in the afternoon. OF course the next day it may be gray and not climb over 70. So I let the excess heat out and hope enough stays to temper the heating bill. SuE http://orchids.legolas.org/gallery/albums.php |
#11
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The heater is run with a thermostat so the heater will turn on any time
it gets colder. I grow just about everything Intermediate. Oh I have some heating cables for my Phals but I cant grow them too well? What kind of heating system do you have in your g/h Keith? It gets really cold in your neck of the woods right? -- Cheers Wendy Remove PETERPAN for email reply kenty ;-) wrote: Hi Wendy,They only got natural light before,growing in the home,were ever I could get them :-).what do you grow to that temp?So you don't raise the temp in the day without the sun help? Hi Keith, I grow in a g/h in S.Calif & have my heater set to go on at 58 degrees. If there are plants that require a chill, they don't get it & or don't grow/bloom. I grow cyms outside. Were you growing indoors under lights before the G/h? -- Cheers Wendy Remove PETERPAN for email reply kenty ;-) wrote: Am I worrying to much about trying to achieve the day/night temp difference,do you find then that in greenhouse culture there isn't prolonged temps that stay the same,i.e. 55f on cloudy days which surely if continued at this temp will do the plants harm?I suppose everyone's conditions are different so it is a case of trial and error.I am only flapping because it is my first year in the greenhouse and don't want to kill the plants.It will be a good learning curve through the months to come! Thanks for the advise,i grow intermediate,what are your conditions for the advise given? -- Thanks Keith,England,UK. "Susan Erickson" wrote in message ... On Sun, 3 Oct 2004 14:31:42 -0400, "Kenni Judd" wrote: All we try to do is knock off the extremes -- misters to keep the temp below 95F in summer, heat to 55F in winter. In between these extremes, whatever the temp happens to be is what it is. We raise it to 65 during the day and let solar gain take it from there. Here in Co it is not unusual to have the roof vent raise in Feb. because it has gotten to 80 in the afternoon. OF course the next day it may be gray and not climb over 70. So I let the excess heat out and hope enough stays to temper the heating bill. SuE http://orchids.legolas.org/gallery/albums.php |
#12
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The heater is run with a thermostat so the heater will turn on any time
it gets colder. I grow just about everything Intermediate. Oh I have some heating cables for my Phals but I cant grow them too well? What kind of heating system do you have in your g/h Keith? It gets really cold in your neck of the woods right? -- Cheers Wendy Remove PETERPAN for email reply kenty ;-) wrote: Hi Wendy,They only got natural light before,growing in the home,were ever I could get them :-).what do you grow to that temp?So you don't raise the temp in the day without the sun help? Hi Keith, I grow in a g/h in S.Calif & have my heater set to go on at 58 degrees. If there are plants that require a chill, they don't get it & or don't grow/bloom. I grow cyms outside. Were you growing indoors under lights before the G/h? -- Cheers Wendy Remove PETERPAN for email reply kenty ;-) wrote: Am I worrying to much about trying to achieve the day/night temp difference,do you find then that in greenhouse culture there isn't prolonged temps that stay the same,i.e. 55f on cloudy days which surely if continued at this temp will do the plants harm?I suppose everyone's conditions are different so it is a case of trial and error.I am only flapping because it is my first year in the greenhouse and don't want to kill the plants.It will be a good learning curve through the months to come! Thanks for the advise,i grow intermediate,what are your conditions for the advise given? -- Thanks Keith,England,UK. "Susan Erickson" wrote in message ... On Sun, 3 Oct 2004 14:31:42 -0400, "Kenni Judd" wrote: All we try to do is knock off the extremes -- misters to keep the temp below 95F in summer, heat to 55F in winter. In between these extremes, whatever the temp happens to be is what it is. We raise it to 65 during the day and let solar gain take it from there. Here in Co it is not unusual to have the roof vent raise in Feb. because it has gotten to 80 in the afternoon. OF course the next day it may be gray and not climb over 70. So I let the excess heat out and hope enough stays to temper the heating bill. SuE http://orchids.legolas.org/gallery/albums.php |
#13
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I have a electric heater run through a thermostat controller & probe which
is very accurate,I have two of this set-up one for day & one for night,both on timers so one set-up takes over from the other,it is automatically done.I just have to initially set the parameters I want,the night is set to 59f/15c and day has been at 71f/22c,but today was really sunny in the after noon so the temp got in the 80`s.After input I have received off you guys I am going to lower the day temp to 66f/19c?What do you think.I live in Robin Hood country,that being Nottingham,England,UK.It can get quite cold here(zone 8)but really not that bad!My greenhouse is only a measly 10x8,but we all have to start somewhere. -- Thanks Keith,England,UK. "wendy7" wrote in message news:x0i8d.122345$9Y5.122048@fed1read02... The heater is run with a thermostat so the heater will turn on any time it gets colder. I grow just about everything Intermediate. Oh I have some heating cables for my Phals but I cant grow them too well? What kind of heating system do you have in your g/h Keith? It gets really cold in your neck of the woods right? -- Cheers Wendy Remove PETERPAN for email reply kenty ;-) wrote: Hi Wendy,They only got natural light before,growing in the home,were ever I could get them :-).what do you grow to that temp?So you don't raise the temp in the day without the sun help? Hi Keith, I grow in a g/h in S.Calif & have my heater set to go on at 58 degrees. If there are plants that require a chill, they don't get it & or don't grow/bloom. I grow cyms outside. Were you growing indoors under lights before the G/h? -- Cheers Wendy Remove PETERPAN for email reply kenty ;-) wrote: Am I worrying to much about trying to achieve the day/night temp difference,do you find then that in greenhouse culture there isn't prolonged temps that stay the same,i.e. 55f on cloudy days which surely if continued at this temp will do the plants harm?I suppose everyone's conditions are different so it is a case of trial and error.I am only flapping because it is my first year in the greenhouse and don't want to kill the plants.It will be a good learning curve through the months to come! Thanks for the advise,i grow intermediate,what are your conditions for the advise given? -- Thanks Keith,England,UK. "Susan Erickson" wrote in message ... On Sun, 3 Oct 2004 14:31:42 -0400, "Kenni Judd" wrote: All we try to do is knock off the extremes -- misters to keep the temp below 95F in summer, heat to 55F in winter. In between these extremes, whatever the temp happens to be is what it is. We raise it to 65 during the day and let solar gain take it from there. Here in Co it is not unusual to have the roof vent raise in Feb. because it has gotten to 80 in the afternoon. OF course the next day it may be gray and not climb over 70. So I let the excess heat out and hope enough stays to temper the heating bill. SuE http://orchids.legolas.org/gallery/albums.php |
#14
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Keith,
I've been following this thread and I have an opinion, even though I don't have a greenhouse. Since you already have your heater system set up for day and night temperatures, I think you should aim for a comfortable 10 degree (f) difference between day and night. If you want to keep the night temperatures no lower than 59f, then set the day temp for 69f. Now, I don't think it would be necessary, or even desirable to keep the temperature that warm all day (unless it is up there due to sunshine). I would set that timer to be on from 11 AM to 3 PM. I would either do away with the timer for the 59 degree setting or, if it is easier, set it for the 20 hours of the day that remain. Hopefully, you will have many days where greenhouse warms beyond 69 degrees before 11 AM and the higher temperature thermostat will not even have to kick in. Steve (wishing for zone 8 but more like 3) kenty ;-) wrote: I have a electric heater run through a thermostat controller & probe which is very accurate,I have two of this set-up one for day & one for night,both on timers so one set-up takes over from the other,it is automatically done.I just have to initially set the parameters I want,the night is set to 59f/15c and day has been at 71f/22c,but today was really sunny in the after noon so the temp got in the 80`s.After input I have received off you guys I am going to lower the day temp to 66f/19c?What do you think.I live in Robin Hood country,that being Nottingham,England,UK.It can get quite cold here(zone 8)but really not that bad!My greenhouse is only a measly 10x8,but we all have to start somewhere. |
#15
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Actually, I think it's better to not artificially raise the daytime
temperature, but to allow it to happen by solar gain instead. The reason being that plants tend to grow in response to warm temperature and higher light intensity. If the two coincide, that is, when the solar flux raises the temperature in the greenhouse, the plant grows normally. If, on the other hand, the temperature is raised when there is no solar flux to speak of - gray, cloudy days - one will tend to end up with leggy, "soft" plants that might not be able to even stand up properly (in extreme cases). My advice is to set your heating for maintaining a decent minimum temperature, and let it go at that. It's better for the plants and less expensive, too! -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Books, Artwork, and Lots of Free Info! .. "Steve" wrote in message ... Keith, I've been following this thread and I have an opinion, even though I don't have a greenhouse. Since you already have your heater system set up for day and night temperatures, I think you should aim for a comfortable 10 degree (f) difference between day and night. If you want to keep the night temperatures no lower than 59f, then set the day temp for 69f. Now, I don't think it would be necessary, or even desirable to keep the temperature that warm all day (unless it is up there due to sunshine). I would set that timer to be on from 11 AM to 3 PM. I would either do away with the timer for the 59 degree setting or, if it is easier, set it for the 20 hours of the day that remain. Hopefully, you will have many days where greenhouse warms beyond 69 degrees before 11 AM and the higher temperature thermostat will not even have to kick in. Steve (wishing for zone 8 but more like 3) kenty ;-) wrote: I have a electric heater run through a thermostat controller & probe which is very accurate,I have two of this set-up one for day & one for night,both on timers so one set-up takes over from the other,it is automatically done.I just have to initially set the parameters I want,the night is set to 59f/15c and day has been at 71f/22c,but today was really sunny in the after noon so the temp got in the 80`s.After input I have received off you guys I am going to lower the day temp to 66f/19c?What do you think.I live in Robin Hood country,that being Nottingham,England,UK.It can get quite cold here(zone 8)but really not that bad!My greenhouse is only a measly 10x8,but we all have to start somewhere. |
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