A THIRTY-YEAR FERTILIZER TEST. 



137 



Table 6. — Relationship hetxveen Increase from Fertilizer Nitrogen, Place 

 in Rotation, and Weather Conditions — Continued. 



Corn, Yields per Acre, South Soil Test — Concluded. 

 II. Second Year after Legume or Sod. 



Precipitation (Inches). 



Above 

 Normal. 



+1.71 



+1.22 

 +0.63 



+0.47 

 +1.93 

 +0.31 

 +0.32 

 +2.60 



+4.41 

 +0.23 

 +0.67 



Below 

 Normal. 



April 

 May 

 June 

 July 



August 



April 



May 

 June 

 July 

 August 



April 

 May 

 June 

 July 

 August 



April 

 May 

 June 

 July 



August 



—1.53 

 —1.85 



—0.96 

 —3.20 



— 19 

 —1.01 

 —0.73 

 —2.51 

 —0.22 



Manure. 



Phos- 

 phoric 



Nitrogen, 

 Phos- 

 phoric 



A?ll\"^ A^id and 



Potash 



Potash. 



59.75 65.90 



5,520 4,880 



"Normal." 



1898. 



71.00 

 5,320 



67.7 41.2 55.9 



3,800 2,440 2,600 



Good growing conditions. 



1903. 



37.39 20.39 25.56 



3,600 2,320 3,040 



Droitght in May; very cold and 

 wet in June; very cold in 

 August. 



1910. 



57.43 37.14 



3,700 2,300 



Drought. 



41.57 

 3,080 



Mean Hodrly 



Temperature (Degrees 



Fahrenheit). 



Above 

 Normal. 



+0.4 



+0.3 

 +0.3 

 +1.7 



+0. 

 +1. 



+4.5 

 +1.5 



Below 

 Normal. 



April 

 May 

 June 

 July 

 August 



April 

 May 

 June 

 July 

 August 



April 

 May 

 June 

 July 

 August 



-0 3 

 -0 4 

 -0.8 

 -0.8 



-3 1 



-1.8 



-6.1 

 -1.7 

 -6.0 



April 

 May 

 June 

 July 

 August — 0.9 



—1.3 

 —1.9 



III. Third Year after Legume or Sod. 



