22 EXPERIMENT STATION BULLETIN 351 



With small amounts of fertilizer, a high-phosphorus formula proved 

 to be slightly superior, but with larger amounts the choice of a formula 

 became less important. If the data for side-dressing as well as amounts 

 of fertilizer are taken into consideration, it would seem advisable for high 

 yields to use a ratio narrower than a 1-4-1 when applying large amounts 

 of material. 



Fifteen tons of manure, supplemented with 400 pounds of super- 

 phosphate, produced almost as much sweet corn as a 30-ton application 

 supplemented in the same manner. It is quite obvious that in using as 

 much as 30 tons of manure in one application some of its plant food value 

 is subject to waste. 



The use of superphosphate in suitable amounts as a supplement to 

 manure proved to be a good practice, although the results here reported 

 do not seem to indicate the need for more than 400 or 500 pounds of 20 

 per cent superphosphate. 



In addition to manure and superphosphate, 200 pounds of 4-12-4 ap- 

 plied in bands with -the corn planter paid good returns. This small 

 amount of complete fertilizer apparently acted as a starter and kept the 

 seedlings growing until their roots reached through the soil for the ma- 

 nure and superphosphate which had been broadcast. 



A planter application of a complete fertilizer had a material effect 

 upon hastening the maturity of sweet corn in this test. 



The results of side-dressing with Chilean nitrate of potash are not 

 too conclusive, and the economy of the practice apparently was governed 

 by the amount and formula of the fertilizer previously applied. With a 

 wide fertilizer ratio, such as the 1-4-1 or 4-16-4 formula, a greater in- 

 crease was obtained than with the 1-2-1 ratio. This, no doubt, relates to 

 the balance of the total nutrients applied. August rainfall had much to 

 do with the effectiveness of side-dressing in this experiment, a wet Au- 

 gust being favorable for this practice. 



General conclusions or recommendations based on three years of ex- 

 perimenting may be summarized as follows: 



1. If no manure is applied directly for sweet corn, or if the land 

 has not recently been manured, at least 1000 pounds of a 20-unit fertilizer 

 may be applied with good results. 



2. If manure is applied, it should be used in amounts of 15 tons per 

 acre of cow manure or 10 to 12 loads of poultry manure. An application 

 of manure should always be supplemented with 400 to 500 pounds of su- 

 perphosphate. A planter application of a good corn fertilizer in amounts 

 of from 150 to 300 pounds should also be made at planting time. 



3. On land that has been heavily manured during the year preceding 

 corn, a broadcast application of 400 pounds of 20 per cent superphos- 

 phate, in addition to a planter application of from 250 to 500 pounds of a 

 good corn fertilizer, should give excellent results. 



F. S. Prince, P. T. Blood 



The Relation of Potash Levels to the 

 Persistence of Clover in Hay Stands 



Previous investigations in this area of research on the Livingston 

 farm in the Connecticut valley have been reviewed in Circular 61, April 



