FIELD CROPS. 



341 



Meld per acre in rotation experiment. 



Wheat continuously, average for six plats 



First, second, and third wheat crops after barren 

 fallow, average for tour plats. . . 



First, second, and third wheat crops after culti- 

 \ ated crops : coin, peas, rape, potatoes, and man,- 

 gels, average for six plats 



Fir^t, second, and third crops of wheat after mil- 

 let, one plat 



First, second, and third crops of wheat alter tim- 

 othy and clover for t\\ o years, one plat 



First crop of wheat alter rlax for one year, average 

 for one plat 



Second crop of wheat after flax for one year, one 



plat. 



First crop of wheat after rlas for three years, one 

 plat 



Flax continuously for three years, one plat 



First and second wheat crops after flax followed 

 l>y fallow, one plat - 



First, second, and third wheat crops after field 

 peas, one pi at 



Fii>t. second, and third wheat crops after green 

 manuring with field peas, one plat 



First, second, and third wheat crops after manur- 

 ing with millet, one plat-.- 



First crop of wheat after potatoes, one plat 



Average 

 for 1893 

 and 1897. 



Bu. 



12.1 



18.4 

 16.8 



Bu. 



9.4 



16.5 



13.:: 



Bu. 

 19.6 



Bu. 

 23.3 



24.9 



2:;.:: 

 23 

 31 

 23.3 



Bu. 

 16 



17.4 i 14.4 

 11.7 10.4 



15.6 14.1 



9.5 

 14.5 

 23. 5 

 23.5 

 22. 8 



23 

 23 

 23.5 



Bu. 

 14.8 



21.3 



20.2 

 20.3 

 21.6 

 19.5 



20.4 

 12. 9 



17 

 16.8 



Wheat was grown after corn and millet on manured and un manured 

 plats. The results showed a marked increase in yield from the appli- 

 cation of manure. 



A study of the castor-oil plant, G. L. Holter and J. Fields 

 (Oklahoma Sta. Btil. 32, pp. 11-15). — The amounts of nitrogen, phos- 

 phoric acid, and potash removed from the soils by the different parts 

 of the castor-oil plant were determined and the results are tabulated. 

 Analyses were made of 3 varieties — 2 common varieties, the seed of 

 which had been obtained from Oklahoma and Kansas, and 1 ornamen- 

 tal variety. The proportion of beans and hulls for the 3 varieties Avas 

 approximately 75 per cent of hulled beans and 25 per cent of hulls. 

 The beans were found to contain about 60 per cent of oil. Directions 

 are given for the determination of castor oil in beans. The fertilizing 

 constituents in the different parts of the plant were found to be as 

 follows : 



Amount of principal fertilizing elements in the castor-oilplant. 



Entire plant 



8192—^0. 4 4 



