248 ANNUAL REPORT OF THE Off. Doc. 



QUESTION: The Pennsylvania valleys are usually covered with a 

 deep, clayey, loamy or shaly soil, the hillsides the same but shal- 

 lower, but under all we have no end of raw soil-making material. 

 We use the short rotation and fill the soil with vegetable matter. 

 Would you advise the use of lime, and how much to the acre? 



PKOF. MASSEY: I did talk about that; I would use lime in regu- 

 lar rotation. 



QUESTION: When there is no trouble to get clover, do you be- 

 lieve it good to practice a two-year rotation, that is clover every 

 other year? 



PROF, MASSEY: No. I would make it a little longer; say three 

 or four vears. 



QUESTION: In a three-year rotation of wheat, clover and pota- 

 toes, will the potato crop be benefited more by applying commer- 

 cial fertilizer after harvesting the clover than by applying when 

 planting the potatoes, the second crop of clover being left on the 

 ground and plowed under in spring? 



PROF. MASSEY: I would apply all the fertilizer to the potato 

 crop. 



MR. CAMPBELL: Why is it that fertilizer manufacturers are 

 asking almost as high prices for floats as for the acid phosphate? 



PROF. MASSEY: Because a trust controls the whole thing. 



MR. C. O. MxVTTERN: What variety of cow peas would you ad- 

 vise this far north? 



PROF. MASSEY: I have just stated that. 



MR. MILLER: Where we lime every third year (lightly) is there 

 any danger of acidity? 



PROF. MASSEY: No, I don't think that is really advisable. I 

 would not lime more frequently th^n once in four to six years. 



MR. MILLER: Would you sow all clover as the third or fourth 

 year rotation? 



PROF. MASSEY: In my experience, I would prefer all clover. 



QUESTION: Can a repellant be introduced into the circulation 

 of a tree to prevent insect injury to the foliage or fruit? 



PROF. MASSEY: I know of none at all. 



MR. HOOVER: W^hat formula of commercial fertilizer is best 

 adapted for the tobacco plant? 



PROF. MASSEY: Commercial fertilizer which should contain at 

 least ten per cent, of potash in the form of hydrosulphate, not in the 

 form of muriate. The nitrogen is best obtained by a small portion 

 of nitrate of soda to start the crop and dried blood is the main source 

 of organic matter; acid phosphate would cause the tobacco to be 

 bouv. 



