Feb. II, 1918 Effect of Season and Crop Growth on Soil Extract 357 



5QLL5 



I/1CHE5 

 5£1 



I 



VK5. PLA/{TL]7 ^ 4 6 6 10 12. 14 t^EACHtP A/^X. HT. 



Fig. 21. — Graphs of the growth of crops in height, season of 1916. 

 Table IX. — Crop yield in igi6 



Soil. 



Yolo silty clay loam : 



No. lA 



No. 2 A 



No. 3 A 



No. 4A 



No. 5 A 



Yolo clay loam , 6A 



Hanford fine sandy loam, 7A. . . 



Fresno fine sandy loam, 8 A 



Kimball fine sandy loam, qA. .. . 

 Tejunga fine sandy loam, loA. . . 

 Madera fine sandy loam, iiA. . . . 

 Arnold fine sandy loam, 12A . . . 

 Standish fine sandy loam, 14A . . 



Total yield 



of air-dry 



grain and 



straw. 



Grams. 

 1,474 

 1,530 

 970 

 1.252 

 1,652 



1.523 

 1,414 



I. 719 



946 



I, 266 



1.547 



970 



1,464 



Grain. 



Grams. 



655 



439 

 549 

 690 

 670 

 541 

 679 



357 

 551 

 625 



390 

 630 



Grain 

 (pounds 

 per acre). 



5. T92 

 5,038 



3,377 

 4.223 



5.307 

 5,153 



4, 161 



5, 222 



2, 746 

 4,238 

 4,807 



3, 000 

 4,846 



Grain 

 (bushel.s 

 per acre). 



85 

 69 

 87 



45 

 70. 

 80, 

 50. o 

 80.8 



Variation 

 from maxi- 

 mum yield 

 of grain. 



Per cent. 



2. 2 



5-0 



36.4 



20. 4 



. o 



2.8 

 22. 5 



1.6 

 48. 2 

 20. I 



9.4 



43-4 

 8.6 



