. Plant propagation; greenhouse and nursery practice. er a rest in grain, hay or pasture. 369. Cover crops for nursery lands.—Since thenursery lands are usually heavy, it would seem that sweetclover should have special value in bringing them backquickly into good heart, because this plant burrowsdeeply and opens up the soil well besides adding con-siderable humus, both by its decaying roots and its tops,when these are turned under. Perhaps it would reducethe resting period to two or three years, as against threeto live or even more under common practice. If covercrops, such as crimson clover,
. Plant propagation; greenhouse and nursery practice. er a rest in grain, hay or pasture. 369. Cover crops for nursery lands.—Since thenursery lands are usually heavy, it would seem that sweetclover should have special value in bringing them backquickly into good heart, because this plant burrowsdeeply and opens up the soil well besides adding con-siderable humus, both by its decaying roots and its tops,when these are turned under. Perhaps it would reducethe resting period to two or three years, as against threeto live or even more under common practice. If covercrops, such as crimson clover, buckwheat and rve, weregrown between the rows and plowed or disked under inearly spring, the evil effects on the land would also belessened. Coarse manure certainly has helped whereapplied between the rows in autumn or spring, but amongnursery stock it is not always convenient to apply. Itshould, therefore, be liberally added after a nurserv crophas been harvested. A second crop could thus be plantedwithin two years with good prospects of 274 .ViRSKRV M.\x.\:xT 275 Commercial fertilizers ma} (jfteu be ai)plied to nurserystock with profit. Usually nitrogen is needed in liberalsupply to insure strong- growth. Considerable quantitiescan be secured from legumes, hence the advisability ofgrowing a crimson clover cover crop. \\hen the treesare showing yellowish leaves on poor spindling growth,a top-dressing of nitrate of soda or sulphate of ammonia,about 300 pounds an acre, during late spring or earlysummer, will help matters considerably, but the tillageshould be good so the soil nitrogen may be utilizedfirst. Nitrogenous fertilizers must be used with greatcaution, otherwise they may force too succulent a , especially if produced near the close of the season,might not ripen. The trees would thus be subject towinter injury, they would transplant with greater dififi-culty and be unsatisfactory to the planter. 370. Winter protection of nurseries.—From over
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