PLATE 62 



A. — One-year-old lemon seedlings, showing the effect of additions of lime and 

 manure to the soil: Pot i, soil untreated; pot 2, 2 per cent of calcium carbonate added; 

 pot 3 , I per cent or manure added ; pot 4, i per cent of manure and 2 per cent of calcium 

 carbonate. 



B. — Two-and-one-half-montli-old lemon seedlings, showing the effect of alkali crust 

 on ground: Pot i, good grove, no crust; pot 2, poor grove, crust on surface. 



C. — Reservoirs, showing the effect of a lime hardpan upon the formation of black 

 alkali: i, Plardpan (CaCOs) at the lower edge of the moisture plane; 2, hardpan mid- 

 way soil column. 



(590) 



