10 X. H. Agr. Experiment Station [Bulletin 280 



tions of complete fertilizer, with one treatment in which phosphorus and 

 potash alone were applied. 



On the Seavey farm, contrary to the previous year's results, super- 

 phosphate and potash gave no response in 1932. {Purnell Fund) 



Phosphorus, Potash Help In Connecticut Valley 



To develop the first year's crop phosphorus seems essential to suc- 

 cess with red clover and alsike in the Connecticut valley, according 

 to one year's results on the Livingston farm near Claremont. Trials 

 conducted on the 80 twentieth-acre plots also indicated that potash 

 will give significant increases in red clover, but that lime will not 

 since this soil is not excessively acid. 



This research on legume production in the Connecticut valley had 

 previously revealed that the best gro^vth of sweet clover and alfalfa 

 came from plots treated with potash. (Purnell Fund) 



Fertilizer Trials for Southern New Hampshire 



Fertilizer trials similar to those long established in Colebrook were 

 begun in Chichester this year for the purpose of getting facts on con- 

 ditions typical of southern New Hampshire. Nine different commer- 

 cial combinations are on test in a three-year dairy farm rotation of 

 potatoes, oats and clover on worn-out hay land. Approximately 150 

 thirtieth-acre plots are laid out in three groups, each of about 50 plots. 

 [Purnell Fund) 



New Results from the Colebrook Work 



The Colebrook experiment occupies 160 twentieth-acre plots divided 

 into three almost equal groups. The same rotation is used as in Chi- 

 chester, with the 13 variations in fertilizers applied only to the potatoes. 



The Norcross variety of potatoes was planted in 1933 instead of 

 Green Mountains, and proved considerably more sensitive to fertilizer 

 variations and particularly to phosphorus. For the first time in the 

 history of this investigation, decrease in yields due to omission of phos- 

 phorus was greater than where potash was omitted. The increase in 

 yields where extra phosphorus was added was greater than in any other 

 year save one. 



This suggests a study of varieties with reference to their sensitive- 

 ness to a lack or abundance of some one fertilizer ingredient. 



The Norcross potatoes responded about like Green Mountains in 

 previous years when potash was omitted, and failed to respond to ad- 

 ditional potash over the seven per cent. Lime in addition to a fertilizer 

 without potash depressed the yield slightly as in previous years with 

 Green Mountains. 



Two tons of lime have caused slightly scabby potatoes on this field; 

 four tons have produced scab on nearly all the potatoes. 



Lime increases the yield of clover and other hay species on this land 

 more than any other fertilizer treatment having a continuous effect. 

 All the fertilizer is applied to the potatoes in this experiment; hay- 

 crop harvest is two full years following any fertilizer application. 



