April, 1932] Agricultural Research in N. H. 9 



The combination of nitrate of soda and superphosphate gave a 

 significant increase on the manured and unmanured sections, although 

 as in past years this increase must be ascribed mainly to the nitrogen 

 rather than the phosphorus used. 



The increases recorded for lime are significant for both the two and 

 four ton applications. It is quite evident that the original pH of this 

 soil is too low for the maximum production of grass hay. 



On the alfalfa plots in the Experiment with Legumes on Neglected 

 Hay Lands it is quite evident that potash has the greatest influence in 

 stimulating growth; phosphorus stands second in this respect, par- 

 ticularly where it is used on heavily manured plots ; and nitrogen ranks 

 third, its beneficial effects decreasing where it is used on the heavily 

 manured plots. 



The benefits of extra lime are more marked when used with heavy 

 manure and fertilizer applications. 



The value of the manure on the plots receiving an extra quantity, 

 although six years have elapsed since its application, is still quite 

 marked. 



In the Experiment with Potatoes in a Rotation on the Jackson farm, 

 near Colebrook, the field is divided into three parts of about 50 twen- 

 tieth-acre plots each; and potatoes, oats and alsike clover are grown 

 each year on different sections of the field in a three year rotation. 



Various fertilizer treatments are applied only to the potatoes in this 

 experiment. Lime has been applied once on those plots receiving that 

 material. 



The yield of potatoes in 1931 was unusually heavy. The check plots 

 i. e. those receiving a ton of 5-8-7, averaged 445 bushels per acre. Al- 

 though all the elements that were added to the 5-8-7 formula in in- 

 dividual instances increased the yield, in no case was the increase 

 significant. 



Decreases on those plots where the phosphorus and potash were 

 omitted were larger than in former years. This may be explained by 

 the fact that in 1931 the rotation entered its second course, potatoes 

 having been grown on these same plots in 1928 and treated the same. 

 There may be some accumulation of phosphorus and potash in the soil 

 on plots supplied with that element ; but in case it is omitted entirely 

 from the fertilizer it seems likely that the deficiency is magnified. 



In the Experiment with Legumes in the Connecticut Valley, eighty 

 plots are located on the Livingston farm near Claremont. 



In this year's results all of the treatments having lime or potash in 

 combination with some other fertility factor are significant. In addi- 

 tion to this, potash alone in the first cutting has given a significant in- 

 crease. 



It is interesting also to note that the series of plots getting NPK or 

 a complete fertilizer treatment is one of the highest yielding of the 

 entire group. 



Pasture Top-Dressing. A new series of sixteen eighth-acre plots 

 was laid out in the spring of 1931 on an area of old pasture land be- 

 longing to Seavey Bros, near Greenland, N. H. One half of each plot 

 was limed, except those plots receiving lime-bearing fertilizers. 



