46 FERTILISERS AS AN AID TO 



returns to large dressings of manure than 



Mangels, and a strong plant and early start are 



very important factors. Phosphates 



importance in a readily available form are very 



of Phosphates, necessary, because of their un- 



eariy start, doubted effect in establishing a full 



plant, and this is one of the great 



difficulties to be overcome. Potash is important 



and will usually more than repay its cost, though 



on some soils common salt gives good results 



because it liberates a portion of the insoluble 



potash in the soil. Where a good dressing of 



rich dung has been given there is probably 



sufficient potash available for the use of this 



crop, possibly also the beneficial action of 



kainit is due to the large proportion of salt which 



it contains. Though large increases are on 



record from very heavy dressings of salt, it is 



extremely doubtful if it is advisable to apply 



more than two or three cwt. per acre on heavy 



soils because of its injurious after-effect on the 



tilth. 



Subjoined are some authentic records of 

 manurial trials of Mangels, from which some 

 useful information is to be obtained. 



The average results at twenty-six farm centres 



in Derby, Leicester, Lincoln and Notts, during 



six years, 1905 to 1910, based on 



previous years' experience, conduc- 



Midiands. tec * by the Midland Agricultural 



and Dairy College, comparing the 



most satisfactory of various combinations of 



fertilisers, added to farm-yard manure, and 



farm-yard manure alone : 



