CROPS UNDER GLASS 



61 



Mr. Work : It is gravel underneath instead of clay. For 

 sub-irrigation you ought to have a fairly tight . bottom. Do 

 you think that in the ground bed those tiles are worth while? 



Mr. Hunter: I think they are. At any rate I can set up 

 a solid bed at the same time as the other benches and get let- 

 tuce earlier and never have any trouble. 



Mr. Work : The point I wanted to get at was this. Under 

 your ground bed you have these tiles for aeration. Have you 

 any ground bed that has not those tiles? I was wondering if 

 there was any difference between tiles and no tiles under a 

 ground bed. What do you think of the possibilities of aerat- 

 ing, Mr. Scott? 



Mr. Scott : I do not know. I have thought it might pos- 

 sibly be of some use. 



Mr. Kilbourn : Do you not think that might help to solve 

 the problem with the fall crop of tomatoes? It Avould seem 

 to keep the earth of the bed near the same temperature as 

 the house. 



Mr. Work:. It would seem that way, but I am afraid the 

 difference in temperature would not be enough to amount to 

 a great deal. 



Mr. Kilbourn : I have seen them so thick the tiles would 

 almost touch, practically m^aking a medium between the bed 

 and the solid bench. 



Mr. Work: There is a question we debated when we put 

 in our sub-heat. We decided not to put a false bottom over 

 those pipes. If we find the distribution of our heat is not 

 even enough, w^e may try out the other, although that does 

 not look as plausible as the plan that we have adopted. How 

 has your crop been this winter, Mr. Wrigley? 



Distances For Lettuce. 



Mr. Wrigley: Good. We are growing Grand Rapids. 

 We plant six by six. 



Mr. Zuck: We plant six by eight. 



Mr. Yoder: We plant seven or eight inches each way. 



