1 7 2 Harsh berg er. — Maize .■ 



substance— starch. 1 It is equally certain that the increased 

 production of sugar, as in sugar cane, is also greatly depend- 

 ent on the supply of nitrogen." With root crops, the amount 

 of sugar is increased by the use of nitrogenous manures. 

 Nitrogen applied to leguminous crops has comparatively little 

 effect in increasing the product of such crops/ 1 



Potash is essential for the formation of the chief non- 

 nitrogenous matters, starch and sugar. 



The results with leguminous crops show that mineral ma- 

 nures (particularly potash) considerably increased the early 

 crops. Ammonia salts were of little or no benefit, and were 

 sometimes injurious. It may be added that the beneficial 

 effects of long previous applications of potash were apparent 

 whenever there was any growth at all. When the land is 

 "clover sick," none of the ordinary manures, whether artificial 

 or natural, can be relied upon to secure a crop. 



In experiments on the effect of various manures, applied 

 on fields at Rothamsted for forty years, it was found that the 

 plats which received ammonia salts alone, gave the smallest 

 yield in bushels, twenty and one-quarter of wheat, and 

 twenty-nine of barley. The sulphates with 600 pounds of 

 ammonia, gave a yield of thirty-six and three-quarter. bushels. 

 It is seen that a mixture of mineral and nitrogenous manures 

 worked to the best advantage. 



Will principles laid down for England and English cereals 

 hold for American cereal productions, especially maize ? The 

 results attained in the United States are summarized as 

 follows: 



Nitrogenous fertilizers materially increase the crop, 4 and 

 the yield was poor when nitrogen was not applied. ' Numer- 

 ous experiments indicate that corn thrives well and yields 

 fair returns when the fertilizer contains one-third or one-half 

 the nitrogen removed by the crop." The crops on the plats 



1 Gilbert. J. H., On Growth of Potatoes, Rothamsted, 20. 

 - Gilbert, J. H , Lecture at Rutgers College, N. J., n. 



3 Lawes, Sources of N. of Leguminous Crops, 1892, 4. 



4 Georgia, Bui. 10, 1890, 20; Exp. Stat. Rec, 11, 550. 



'" Massachusetts Stat., 7th Annual Rep., 18S9, 14S; Exp. Stat. Rec, 11, 579. 

 Connecticut. Storr's Stat., 2 Rep., 1889. 



