11 



that the plantation has perfect air drainage, so that 

 the cold air can drain away ; and therefore a position 

 on sloping ground is the best. 



One thing the planter should be careful of, and 

 that is to plant no belt of evergreen shelter trees 

 along the boundary *t the lowest portion of the 

 grove. Such trees, being in full leaf in winter when 

 the frosts occur, prevent the cold air from passing 

 freely away and force it back upon the plantation, 

 thus causing frost on the lower portion of the grove. 

 Should a breakwind be required along the lower 

 boundary, it should consist of deciduous trees. 



GOOD DRAINAGE ESSENTIAL. 



As ail varieties of citrus trees are impatient of 

 stagnant water about their roots, they should only 

 be planted on land having perfect drainage, and, 



therefore, shallow soils, or very heavy soils whereon 

 the water stagnates, must be avoided by the planter. 



As one of the greatest drawbacks on an irrigation 

 area is the menace of seepage, land that is full of 

 hollows, or that has a heavy sub-soil, should not be 

 chosen. Seepage is brought about by the irrigation 

 water running along the sub-soil and coming to the 

 surface where this sub -soil is shallow or where it 

 meets the surface of the ground. Blocks situated 

 on sandy rises which peter out on to clay flats are 

 liable to develop seepage, which will show itself along 

 the line just above where the clay and sand meet. 

 Land that contains hollow, basin-shaped, depressions 

 should also be avoided, for unless the sub-soil of 

 such depressions consists of deep sand, the water 

 from the surrounding higher lands will <oak into 

 the hollows and kill the plants it contains. A block 

 of land having deep soil of a uniform nature, with a 

 not too tenacious sub-soil, and having an even slope, 

 is about as good a proposition as can be obtained. 



