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- Author or Editor: John G. Seeley x
Abstract
The Society for Horticultural Science was organized September 9, 1903 with objectives that included the strengthening of horticultural investigation and teaching and the development of horticulture as a science. However the pace for research and teaching relating to commercial floriculture, was much slower than for pomology and olericulture. The major beginning for Society publications in floriculture began 27 years after the Society was formed!
Abstract
Chrysanthemum morifolium Ramat ‘Fred Shoesmith’ was grown in a soil medium previously used to grow Easter lilies, Lilium longiflorum Thunb. ‘Ace’, treated with single drenches of a-cyclopropyl-a-(p-methoxyphenyl)-5-pyrimidine methanol (ancymidol) in early February and harvested April 26. Enough ancymidol was retained in the medium after 76 days of lily growth and 52 surface-irrigations to significantly retard chrysanthemum growth. Plant height after 10.5 weeks was about 12 and 29% less in media from 0.25- and 0.50-mg (active ingredient) ancymidol drench treatments, respectively, than in untreated medium. However, chrysanthemums grown in a new soil medium in new clay pots were about the same height as plants in new soil medium in pots from the 0.50-mg treatment, indicating that not enough ancymidol to retard chrysanthemum growth was retained in the clay pots.
Abstract
Principles of greenhouse plant culture are an important component of the college-level study of commercial crop production. The ever-increasing information from research has expanded the amount of knowledge to be taught. Thus, development of more efficient and effective methods of teaching is necessary to increase educational productivity. For example, change from a “lecture-slide-discussion” method to an “auto-tutorial supplement” method in a greenhouse crop production course may increase the course content and number of crops studied, and provide more time for discussion of production concepts and plant growth principles. Slide sets reviewed individually by students can supplement assignments in textbooks and illustrate more phases of crop production.
Abstract
Ornamental horticulture is concerned with the cultivation, production and use of plants and flowers for enhancement of the environment indoors as well as outdoors, where well planned landscape plantings not only improve the environment but also add to the esthetic and functional value of the area. In the U.S., the term commercial floriculture crop production applies to cut flowers, potted flowering and foliage plants, and bedding plants produced in heated glass or plastic structures, or out of doors.
Abstract
Poinsettia (Euphorbia pulcherrima Willd. ex Klotz) was grown in peat-perlite and fertilized at every watering with N and K at 2 levels each, 300 and 30 ppm, in all combinations. Recently matured upper leaves were sampled biweekly and analyzed for N, P, K, Ca, and Mg. N level exerted its greatest effect on N concentration. Ca and Mg concentrations were significantly reduced and K increased by 300 vs. 30 ppm K. P concentration was unaffected by fertilizer treatment. Both N and P concentrations tended to decrease with later sampling. The pattern of change in K, Mg, and Ca concentration during the sampling period was dependent on K level.
Abstract
Poinsettia (Euphorbia pulcherrima Willd. ex Klotz) was grown in unbuffered nutrient solutions varying in proportion of NH4-N:NO3-N at 50 ppm N. Reductions in shoot and root dry weight and subseqeunt NH4-N absorption, accompanied by the increase in solution acidity with initial NH4-N absorption, occurred with 75% and 100% NH4-N treatments, as compared to treatments of 50%, 25%, or 0% NH4-N. Depression of NH4-N absorption with 100% NH4-N treatment caused a reduction to the critical level of total reduced N in the upper leaves and the appearance of N-deficiency symptoms. Characteristic symptoms of NH4-N injury to plants—large increases in tissue NH4-N and soluble organic N, leaf interveinal chlorosis, and marginal necrosis—did not occur in any treatment. In a second experiment, CaCO3 added to the 100% NH4-N solution at 0, 88, 176, or 264 mg/liter resulted in varying degrees of pH control. Some increase in shoot and root dry weight occurred at 88 and 176 mg CaCO3/liter; CaCO3 at all rates greatly increased NH4-N absorption compared to 0 mg CaCO3/liter, and increased total reduced N in the leaves and roots. Lower leaves of plants with CaCO3 displayed symptoms of NH4-N injury and significant accumulations of NH4- N and soluble organic N. The detrimental effects of NH4-N on poinsettia appear to be dependent on the degree of pH control in the root medium and its effects on root growth and NH4-N absorption and utilization.
Abstract
In nutrient culture, growth of hybrid plants of Cymbidium and Phalaenopsis was optimal with 100 ppm N, 50-100 ppm K and 25 ppm Mg and optimal for Cattleya with 50 ppm each of N, K and Mg. Cymbidium plants developed N deficiency symptoms when supplied with 50 ppm N. K levels tested had little effect on growth responses. Mg at 100 ppm decreased growth of all 3 genera in comparison to 50 ppm.