Gardening/Orange
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ORANGE.--Oranges are grown extensively in Florida, in places along the Gulf, and in many parts of California, but in the most favored sections there is occasionally some injury from cold or frost to the trees or fruit.
The soil preferred for oranges in California is a rich, deep alluvium, avoiding hard-pan or adobe subsoils. Stagnant water in the subsoil is a fatal defect. Although they can be grown near the ocean at a lower level, an elevation of 600 to 1200 feet is generally desirable. While southern California is particularly adapted to orange culture, the fruit is successfully raised along the foot-hills of the San Joaquin and Sacramento valleys and in other parts of the state.
In Florida, pine lands with a clay subsoil are generally preferred for oranges, but if properly handled, good results can be obtained from hammock land. As elevated spots cannot be secured, a timber belt surrounding the orchard or along the north and west sides is desirable.
The distance for the large-growing kinds of orange in the orchard is from 25 to 30 feet each way, but the half-dwarf kinds, such as Bahia or Washington Navel, may be as close as 20 feet each way, although 25 feet will be desirable. If the roots are sacked, the trees should be placed in the hole without removing the covering, and the soil should then be packed about them; but if they are puddled, a mound should be made in the bottom of the hole. In the center an opening should be made into which the tap-root can be inserted. After the soil has been firmly packed about it, the other roots should be spread out and the hole filled with good soil, packing it carefully. Care should be taken that the roots are not exposed in handling the trees, and if the weather is hot and dry, the tops should be shaded. Water may often be used with good results in settling the soil about the roots.
When transplanted, the tops should be cut back in proportion to the amount of roots lost in digging the trees. The head is usually started with the branches about 2 feet from the ground. Each year while the trees are small, the strong shoots should be cut back to preserve a symmetrical form and the weak and surplus shoots should be removed.
The cultivation of orange orchards should be the same as recommended for other fruits, except that as they grow in hot, dry climates, it should be even more thorough, that the evaporation of moisture from the soil may be reduced to a minimum. California growers have found that by frequent shallow cultivation they can reduce the amount of water that must be applied by irrigation, and that frequent tillage and a little water will give better results than little or no cultivation and a large amount of water. The amount of water required will also depend on the season and the character of the soil. Thus on strong soils and after a heavy rainfall no irrigation will be required, while sandy soils will need irrigating as often as once in three or four weeks from May to October. As a general rule, two or three irrigations in a season will be ample. When used at all, water should be applied in sufficient quantities to wet down to the roots of the trees. Frequent scanty waterings may do much harm. The water is usually applied in furrows, and for young trees there should be one on either side of each row, but as the roots extend the number should be increased, until when five or six years old the entire orchard should be irrigated from furrows 4 or 5 feet apart. In Florida, irrigation is not practiced.
Cover-cropping in winter is now common in Florida and California, some of the leguminous crops being used.
_Varieties of the orange._
Among the best varieties are: Bahia, commonly known as Washington Navel, Thompson Improved, Maltese Blood, Mediterranean Sweet, Paper Rind St. Michael, and Valencia. Homosassa, Magnum Bonum, Nonpareil, Boone, Parson Brown, Pineapple, and Hart are favorites in Florida. The tangerines and mandarins, or the "kid-glove" oranges, have a thin rind that is easily detached from the rather dry pulp. Orange trees are frequently injured by various scale insects, but for several of the most troublesome kinds, insect parasites have been found that keep them partially or wholly in check, and for others the trees are sprayed, or fumigated with hydrocyanic acid gas.
