65 



3. Rotation Experiments. 



The Unexhausted Manurial Value of Cake and Corn 



(Stackyard Field). 



(a) Series C, 1922. Swedes. 



The previous rotation being- concluded with wheat (1921) 

 following- red clover, swedes were put in as the first crop of the 

 new rotation. The drought towards the end of May and through- 

 out June made the swede crop very uncertain ; the seed was drilled 

 on June 18th, mineral manures (superphosphate 3 cwt., sulphate 

 of potash 1 cwt., per acre) being applied shortly before (May 26th). 

 A plant was, with difficulty, obtained, and a small crop, though 

 uniform over the area, was grown. A top-dressing of 1 cwt. per 

 acre nitrate of soda was given after singling. The crop was, later 

 on, fed off with sheep, one half with cake, the other half with corn. 



(b) Series D, 1922. Barley after Swedes. 



The swede crop of 1921 being too small to feed off on the land, 

 it was removed, and barley ("Beaven's Archer") drilled on April 

 11th, superphosphate 2 cwt. per acre and sulphate of potash 

 1 cwt. per acre having been applied April 7th. 1 cwt. sulphate of 

 ammonia per acre was given later as a top-dressing. Red clover 

 was sown in the barley on May 22nd. The barley was only a 

 moderate crop and was cut on September 30th. It took a long 

 time to cart, owing to bad weather, but was ultimately stacked 

 October 11th, and was threshed December 10th. 



The results follow. 



Rotation Experiment — the Unexhausted Manurial Value of Cake 

 and Corn. Series D (Stackyard Field), 1922 — Barley after 

 Swedes {carted off) . 



The yield was poor, and not equal to the manured plots of the 

 continuous barley series in the same field, where, however, 

 "Plumage Archer" had been grown as against "Beaven's Archer" 

 here. Moreover, the yield after feeding of corn was somewhat 

 above that after feeding of cake. 



4. Green Manuring Experiments^ 

 (a) Stackyard Field. Series A. 



After the growing of gr^en crops (tares and mustard) in 1921 

 it was decided to make a change in these plots, the whole area of 

 4 acres being divided into an upper and a lower half, and a re- 

 arrangement made by which, while the alternation of green crop 

 and corn crop was kept up, there should be every year one half in 



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