. Fruits, vegetables and flowers, a non-technical manual for their culture. id. Eight-year ex])erimcnts showno gain over checks by the use ofsulphate of potash with oranges andvery slight gains with lemons. Similarexperiments with sujierphosphate showbut slif^ht gains over check plats, whilenitrogen ])lats give marked increase ingrowth and yield. California growersin general prefer stable manure to anyother fertilizer and are also using largequantities of alfalfa hay and beanstraw, both plowed under and as amulch to supply nitrogen and organicmatter. The use of legninous cover cropsin citrus o
. Fruits, vegetables and flowers, a non-technical manual for their culture. id. Eight-year ex])erimcnts showno gain over checks by the use ofsulphate of potash with oranges andvery slight gains with lemons. Similarexperiments with sujierphosphate showbut slif^ht gains over check plats, whilenitrogen ])lats give marked increase ingrowth and yield. California growersin general prefer stable manure to anyother fertilizer and are also using largequantities of alfalfa hay and beanstraw, both plowed under and as amulch to supply nitrogen and organicmatter. The use of legninous cover cropsin citrus orchards to suj)iily nitrogenand organic matter is recognized asgood practice, both in California andFlorida (.see above under Cultiva-tion), and a considerable amount of the nitrogen can be i)roduce(l in this way at very slight exj> Pruning.—Ordinarily orange trees are pruned very little beyond the moval of dead brush and wat(>r-sprouts. \t this results in the formation a very dense tree with the fruit distributed over the surface. The intc-. PuUNINf, AND RoOtTuIMMINC. OK at Timk ok I*\(!. CITRUS FRUITS 147 rior fruit is in general superior, and the removal of some of the interior limbskeeping the tree somewhat open is probably a desirable practice. Lemon trees are generally pruned regularly. They should be cut backseverely from the first and allowed to develop but slowly. The tendencyof the lemon is to throw out long branches, which fruit at the end and arelikely to bend over and break off or to be in the way. The principal purposeshould be to cut back this rapid growth and develop a strong, stocky treethat will be open enough to bear considerable fruit on the interior lateral, crooked branches are much more fruitful than the upright,straight branches. Trees are pruned at almost any season of the year, but the best timeis in the spring after the danger of freezing is passed. Frost Protection.—Many citrus-growing secti
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