236 



FERTILIZERS FOR VEGETABLES 



tain extent, provided you do not get in so much as to loosen up 

 the soil and make it too porous. 



Question: What cover crop do you recommend? 



Professor Van Slyke : Any cover crop that you can grow 

 to best advantage. 



Question: How late could you sow crimson clover? 



Professor Van Slyke: Probably August, if you could 

 get the other crop out of the way by that time. 



Question : Why not plow it in the fall ? 



Professor Van Slyke : It is all right to plow it under if 

 you can get it started. As I understand it, you are speaking 

 of putting in a cover crop after you get off your other crop. 



A Member: Not necessarily. 



Professor Van Slyke : That would be all right. 



Question: Would not alsike clover be good? 



Professor Van Slyke: One trouble with putting clovers 

 on muck soil is on account of the acidity. They will not grow 

 on an acid soil. 



Question: Can you get cowpeas as far North as this? 



Professor Van Slyke: There are certain strains that 

 can be used here. If you will write to the Bureau of Plant 

 Industry, Department of Agriculture, at Washington, they 

 can give you the information and probably can send you a 

 bulletin which will cover just that point. 



Question : When you add muck to the manure instead of 

 acid phosphate, how much do you add? 



Professor Van Slyke: Just add enough so that it takes 

 up the liquid. 



Unavailable Nitrogen. 



Question: How long does it take hair manure and hoof 

 meal and things of that type to become available? 



Professor Van Slyke: Probably in fifteen or twenty 

 years they might be available. You used to hear a good deal 

 about such materials, which are practically worthless as far 



