10 



The green cowpeas contained at the time of cutting 90 per cent of 

 water. For a few days after the plants came up the treatment seemed 

 to be slightly harmful. In a short time, however, the plants recov- 

 ered and began a renewed growth, making an increase of 89 per cent 

 over the untreated soil. Both the untreated and treated soils were 

 replanted three times, thus producing four successive crops. In the 

 second crop the comparative yield of the untreated and treated soils 

 was 100 and 650, respectively, or a gain of 550 per cent for the treated 

 soil. It is also worthy of note that while the untreated soil produced 

 only one-third as much as it did the first time, the treated soil pro- 

 duced more than it did the first time, whereas a crop grown on a fresh 

 sample of the same soil yielded approximately the same amount as the 

 first crop of the above untreated sample. In the third crop the rela- 

 tion of the untreated and treated soil was 100 and 293, respectively, 

 and for the fourth crop 100 and 288. The fourth crop on the treated 

 soil was slightly greater than the first crop on the untreated soil, 

 which shows that the treatment had lasted through four successive 

 crops of wheat without permitting the yield to go below what it orig- 

 inally was on the untreated soil and without re-treatment with the 

 green manure. The aggregate increase produced by this treatment 

 was equivalent to 55.000 pounds of green matter per acre, or 70 

 bushels of wheat for the four crops. 



Both the treated and untreated soils were now re-treated with cow- 

 peas'at the rate of 5,000 parts per million of dry matter, or the equiva- 

 lent of 5 tons per acre, and replanted to wheat for the fifth time. 

 The yield from each of the soils was greater than any of the yields 

 from the previous treatment and was the largest for the sample 

 which had grown poor crops without any treatment, the yield being 

 at the rate of 45 bushels per acre. 



The following table gives the relative growth for various treat- 

 ments which have proven decidedly beneficial on the Leonardtown 

 loam, poor : 



ReJatirc (iroirtlt for various treatments on Lconanltoicn loam, poor. 



Treatments, pounds per acre. 



Relative 

 growth. 



Untreated 



Manure, 20 tons + lime, 6,000 pounds + sodium nitrate, 500 pounds + potassium sul- 

 phate, 500 pounds .-- 



Manure, 10 tons + sodium nitrate, 500 pounds + potassium sulphate, 500 pounds 



Manure, 10 tons + lime, 2,000 pounds 



Cowpeas, 9 tons 



Manure, good quality, 20 tons 



Cowpeas, 2i tons + lime, 1,000 pounds 



Manure, poor quality, 10 tons + sodium nitrate, 500 pounds 



Lime, 1,000 pounds 4- potassium sulphate, 200 pounds 



Cowpeas, 5 tons 



Lime, 2,000 pounds 



Cowpeas, 2i tons 



100 



230 



195 

 193 

 189 

 1T 

 17-J 

 103 

 143 

 145 

 140 

 138 



