CHAPTER V 



EXPERIMENTS UPON BARLEY 



I. The Continuous Growth of Barley upon the same Land, Hoos Field : 



A. Maintenance of Yield under the Continuous Growth of Barley on 



the same Land. 



B. Effect of Nitrogenous Manures. 



C. Effect of Mineral Manures. 



D. Character of the Crop as affected by Manuring. 

 II. Barley grown in Rotation Agdell Field. 



Practical Conclusions and References. 



I. THE CONTINUOUS GROWTH OF BARLEY UPON THE SAME 

 LAND, Hoos FIELD. 



THE experiments on the continuous growth of barley were 

 begun in the Hoos field in 1852. The arrangement of the 

 plots and the manures applied to each plot have practically 

 been unchanged since, so that the plots to-day show the 

 effects of more than sixty years' continuous growth of barley 

 under the same treatment year after year. 



The Hoos field adjoins the Broadbalk wheat field, and the 

 soil is very similar. 



The following varieties of seed have been sown : Chevalier, 

 twenty-nine years, 1852-1880 ; Archer's Stiff Straw, ten years, 

 1881-1890 ; Carter's Paris Prize, seven years, 1891-1897 ; and 

 Archer's Stiff Straw, 1898 and since. 



The manures are sown in the spring, and ploughed in about 

 a week or a fortnight before seeding. The plots do not run the 

 whole length of this field, as in Broadbalk. Instead, there are 

 four longitudinal strips receiving different combinations of the 

 mineral manures ; these are all crossed by four breadths 

 receiving different nitrogenous manures. The mineral manuring 

 on the strips is as follows : (1) none ; (2) phosphoric acid only, 



