. Plant propagation; greenhouse and nursery practice. y springand laid flat side downward in a mild hotbed filled with light soilor sand. The slips or sprouts are carefully pulled when four tosix inches long and transplanted in the field. New varieties of Irishpotato are often propagated in this way and also by stem cuttingsso produced (166). CHAPTER vn BOTTOM HEAT 132. Bottom heat is the heat applied beneath the grow-ing plants by means of fermenting material (manure,spent tan bark, brewers grains, etc.) by warm flues, hotwater or steam. It is used more or less for all kinds ofseeds started i
. Plant propagation; greenhouse and nursery practice. y springand laid flat side downward in a mild hotbed filled with light soilor sand. The slips or sprouts are carefully pulled when four tosix inches long and transplanted in the field. New varieties of Irishpotato are often propagated in this way and also by stem cuttingsso produced (166). CHAPTER vn BOTTOM HEAT 132. Bottom heat is the heat applied beneath the grow-ing plants by means of fermenting material (manure,spent tan bark, brewers grains, etc.) by warm flues, hotwater or steam. It is used more or less for all kinds ofseeds started in advance of the outdoor season, espe-cially for those of warm climate plants, 1)ut only seeds ofcertain tropical plants require high heat to garden seeds do not need bottom heat, though manysprout quicker if warmed from below: always whenbottom heat is used the seedlings should be removed tocooler places very soon or they will become leggy;i. e., tall, spindling, and weak. Good ventilation by daywill help make them stocky and FIG. 74—STRAW MAT FOR COVERING HOTBEDS AND COLD FRAMES 86 BOTTOM HKAT 87 The expression ten degrees of bottom heat meansthat the bed should be that many degrees warmer thanthe air just above the bed or in the propagating , however, the temperature of the l)ed is indicated,as 60, 70, or some other degree. 133. Natural bottom heat obtained from the sun duringthe day is of importance at all times, but is scarcely con-sidered in greenhouse winter work, except as somethingto offset heat from the pipes in the propagating hotbed, cold frame and other structures not usually
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