174 



Journal op the Department of Agriculture, 



Manurial Treatment on Fields A and B. 



Plot 

 1 

 2 

 3 

 4 

 5 

 G 



No manure 



Nitrate of soda, 20011). per acre... 



Sulphate of ammonia, 1601b. per acre , 



Superphosphate, 40011). per acre 



Basic slau;, 4001b. per acre 



No manure 



Lime, 4001b. per acre 



Sulphate of potash, 1501b. per acre 



Nitrate of soda, 2001b. per acre... 



Superphosphate, 4001b. per acre 



Maize ion 

 Field A. 



iio;i). 



spoilt 



22011). 



36011). 



28011). 



1301b. 



20011). 



54.5 lb. 



13451b. 



Cowpeas on Field B. 



Green Crop. 



5300 lb. 

 .-.60011). 

 492011). 

 57001b. 

 4900 lb. 

 39401b. 

 46801b. 

 550011). 



6380 lb. 



Hay. 



18401b. 

 20201b. 

 170011). 

 21601b. 

 18201b. 

 17801b. 

 16201b. 

 19001b. 



21201b. 



Field A. — By far the best yield of maize wa.s obtained from plot 

 No. 9, wiiich was manured witli a nitro<?enous and phospliatic 

 fertilizer. It g-ave a yield twelve times as o-^eat as the yield on 

 unmanured plot No. 1 and eleven times as great as the averag*e yield on 

 nnmanured plots Nos. 1 and G. The plot manuied with sulphate of 

 potash gave a g^ood increase over the nnmanured plot, but it must be 

 remembered that this soil is exceptionally poor in potash, containing 

 only 0.0009 per cent, of available potash. The soil is so poor that 

 the addition of any of the three plant food constituents will probably 

 show an increase in the crop, and there can be little doubt that had a 

 tenth plot been added, manured with all the three plant food con- 

 stituents, the yield would have been still greater. 



Field B.^ — The results of the experiment with the cowpeas show 

 very little difference in yield on the various plots. It certainly would 

 not pay to manure cowpeas, even when grown on a very poor soil, if 

 the above results represent the effects of manuring-. 



In the second year maize was grown on both the fields without 

 the addition of any fertilizer and the yields on the various plots show 

 the residual value of the manures very clearly. The following table 

 gives the yield of maize in the second year on fields A and B as well as 

 the total yield of maize on field A for the two years : — 



These results show that field B on which cowpeas were grown in 

 the first year gave much better results all along in the second year 

 than field A on which maize followed maize. In fact on all, except 

 two plots, namely, No. 8 and 9, there was a greater yield of maize 



