191 
Puant Foop Remove sy A Grape Crop. 
Manuring must restore to the soil the annual renoval of plant 
food. 
In the case of the grape vine Miintz’s investigations has brought 
out the fact that the warmer the climate the more complete the 
utilisation of plant food, so that for an even yield the vineyards of 
cold, northern climate (Champagne) require heavier applications 
of fertilisers than those of the warmer South (Midi). 
The following table shows the removals of each plant food 
element by 100 gallons of wine in each of the districts below :— 
Prant Foop IN LB. REMOVED By 100 GALLONS oF WINE. 
—— Nitrogen. cea Potash. 
South of France 5-5 1:3 5-0 
Claret (Bordeaux) 9-0 2:5 10:5 
Burgundy ... 10-2 2-9 10-2 
Champagnes... 10-9 4-1 18-1 
In estimating the removal of plant food, the leaves and canes 
must also be taken into consideration, and an amount of fertilisers 
in excess of that indicated above allowed, especially of phosphoric 
acid, which is more difficult to absorb. 
The Connecticut Agricultural Station showed in the same 
analytical manner that the fruit of a crop of stone fruit planted 
18ft. x 18ft., or 130 per acre, on an average removes— 
Nitrogen oe ad ae «»  201bs. 
Potash ... any sis aes «.  22bs. 
Phosphoric Acid as ves ann 5lbs. 
The restoration of this will, strictly speaking, restore the 
ground to its fertility, but an excess must be provided as the root- 
lets do not travel far and food must be placed within easy reach. 
WEIGHT OF ONE ACRE OF SOIL AND OF ITS CONSTITUENTS. 
To ‘the untrained mind the perusal of a statement of a soil 
analysis conveys no tangible idea of the amount of the constituents 
declared therein and contained in any definite depth of soil, on, for 
instance, one acre of land. An approximate idea of the weight 
of average agricultural land gives a relative idea as to its richness 
or deficiency in any of the manurial constituents. One acre con- 
tains 43,560 square feet of surface, and a depth of one foot of 
that area therefore contains 43,560 cubic feet of soil. The weight 
of one cubic foot of soil varies greatly from the heaviest—rocky and 
sandy soils—to the lightest—peaty and clayey soils. The average 
