234 



WllKAT SOILS OF THE ALKXANDRIA DTVTSION. 



brin.^ them 

 as follows :- 



No. of 

 Soil. 

 I. 

 3- 



UJ. 



to normal. These ([uantities are api)roximately 



Plant Foods required (in i)Oimds per acre). 



7- 



9- 



II. 



13- 

 I.S. 

 17- 

 19- 



Nitrogen. 



2,400 



2.900 



T.IOO 



800 



700 

 2,200 



l,QOO 

 1.900 



Potash- Phosphoric Oxide. 



1. 1 00 

 1 ,300 

 2,100 



900 



i,6co 



500 

 900 



600 



1. 000 



800 



1,400 



These results may be achieved by adding the following 



quantities of the fertilisers specified below to the respective 



soils : — 



Sulphate of Basic 



No. Soda. Potash. Slag. 



Ih. per acre. lb. per acre. 



3- 



9- 



II. 



13- 

 i.S. 

 17- 

 19. 



Nitrate of 



Soda. 



lb. per acre. 



16,800 



20,300 



7.700 



5,600 



4,900 

 1.S.400 

 13..300 

 13..300 



per acre. 



2.200 

 2,600 

 4,200 



1,800 



3.200 



3.500 

 6,300 



4.200 



7,000 

 S.600 

 9.800 



riie nitrate of soda is assumed to contain about 14.3 per 

 cent, of nitrogen, the sulphate of potash 50 per cent, of potash, 

 and the basic slag 14.3 ])er cent, of citric-aci(l-soluble i)hosphoric 

 oxide. 



The above would naturally be regarded as enormous quan- 

 tities to add to the soil in one year, but they are mentioned 

 }>rimarily to emjjhasise the fact of the .soil's poverty in those 

 essential constituents of ])lani food. Whatever one may do in 

 times of i)eace and ])lenty. all that can be aimed at tuider present 

 conditions is to antici])ate the needs of the next annual crop. I£. 

 half a ton per acre of good average inibiinit kraal maiuire. 

 together with 125 lb. of J 6 ])er cent, superphosphate, were su])])lied 

 to the soil at sowing time, and later on 75 lb. of sulphate of 

 ammonia or 100 lb. of nitrate of soda, good provision will have 

 been made for \hv ensuing harvest. The additional amount of 

 nitrogen needed would be sui)i)lied b\- sowing clover as a catch 

 cro]) and ploughing it under when it has gathered sufficient nitro- 

 gen from the air to jjnjvide fully for next season's wheat crop. 

 When this course is adopted, the method of manuring would 

 probablx niidi-rgo some readjustment; 300 lb. of kraal manure 

 ash and js lb. of 16 per cent. superphos]~)hate would then be 

 supplied to each acre of clf)ver sown, followed 1)\ 100 lb. of 

 su])erphos])hate and 30 lb. of Cioveinmcnt guano wlun the wheat 

 is put in. 



