Seaweed 



salt) that these chlorides may be a positive hindrance 

 to the crops. 



Seaweed ought not to be used continually on the 

 same ground, but alternately with farmyard manure, 

 or better still in conjunction with equal quantities 

 of farmyard manure. This would allow the rain 

 water to carry away the excess of chlorides in 

 question, without permitting them to do any harm. 



Being too poor in phosphoric acid all seaweed 

 manure ought to receive reinforcement of this 

 manure. Then it could be used advantageously 

 for clover and potato crops, but for the latter an 

 addition of sulphate of ammonia and nitrate of 

 soda (NaNag) will be required, while on mangolds 

 an addition of nitrate of soda, given in preference 

 in two lots, is necessary. The use of seaweed brings 

 up the clovers on pastures as do all potassic manures. 



It is not recommended for turnips because the 

 phosphoric acid cannot be assimilated quickly 

 enough, and also it contains too little of it for crops 

 of this kind. It is less rich in nitrogen than farm- 

 yard manure, and what it possesses is not comparable 

 to that of farmyard manure, because it is present in 

 a form very difficult of assimilation. It is therefore 

 a slow fertiliser. After a little time in the soil it 

 loses a great part of its bulk. The large quantity 

 of water it contains makes it unsuitable for transport 

 to any distance. 



Here are average contents of its principal con- 

 stituents derived from about lo analyses : 



Water 75 per cent. 



(i) Organic matter .. ..20 „ 

 Phosphoric acid . . . . 0*25 „ 

 121 



