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Soil cooling for freesias






Acta Horticulturae (51): 123-130

Soil cooling for freesias

The optimum soil temperature for freesia flower production is 15-18 deg C. To maintain these temperatures during the summer water-cooling was carried out. The technique is described.


Accession: 000499654



Related references

Wiel van Son, A. van de, 1984: Results of pipe-water cooling at Venlo Experimental Garden. Freesias can be harvested 2 months earlier by soil cooling. Corms of the freesia cultivars Rosalinde and Ballerina were planted in a glasshouse on 22 June, at depths of 2 or 10 cm, covered with Styromull [expanded polystyrene granules] or peat. The crop was grown with or without soil cooling until 19 Septe...

Juhanoja, S., 1990: The effect of soil cooling on the flowering of summer-planted freesias. Freesia corms (6 cultivars) were planted under glass in the first half of June and the soil was cooled by circulating cold water at about 8-10 degrees C in plastic pipes placed in the peat. Half of the beds were covered with a 2- to 3-cm-deep laye...

Bredmose, N., 1976: Programming of corm-raised freesias. I. Temperature treatment, duration of cooling treatment and lighting of corms during cooling. The effects on flowering and new corm production were investigated for different durations and timings of warm (30 deg C) and cool (13 deg ) treatment prior to planting corms of the cvs Golden Melody and Royal Gold under glass. Although corms deve...

Hayashi, I., 1971: Studies on the mineral nutrition of freesias during forcing. I. Growth phases and nutrient uptake in freesias, and the leaching of nutrients during forcing. Fifty-four Rijnveld Golden Yellow 2.56-g corms were planted on 21 September in 36 X 60 X 9-cm boxes of yellow-brown volcanic ash soil to which was added 54 g of a compound fertilizer containing half of its N in slow-release form, fused phosphate a...

Hayashi, I., 1971: Studies on the mineral nutrition of freesias during forcing. II. Effects of rates and methods of applying different fertilizers on the growth and flowering of freesias during forcing. The planting details were generally as described in part I [see preceding abstract]. From a study of various fertilizers, including rape-seed meal and bone meal, which were mixed with the upper, lower or both layers of soil, it is recommended that...

Koike, S.; Satake, T., 1989: Sterility caused by cooling treatment at the flowering stage in rice plants iv. effects of the starting time of cooling morning and evening and the soil temperatures and the light conditions after cooling on the fertility. Effect of the starting time of cooling at the flowering stage together with the effects of water temperatures and light conditions after cooling on the fertility percentage were examined. The fertility percentage of the spikelets cooled from the e...

Dorst, H.J.M. van, 1973: Leaf necrosis of freesias, a disease that is transmitted through the soil. The symptoms of leaf necrosis alone and in combination with freesia mosaic virus infection are described. Leaf necrosis is probably caused by a virus but is not transmitted by above-ground agents. The results of trials are reported indicating that...

Koop, Jjm, 1984: Mechanical cooling process most important form of soil cooling for Freesia. Vakblad voor de bloemisterij, 39(15): 52-53

Ubbels, J., 1962: Cooling of milk in jacketed milk tanks. Cooling time, consumption of cooling-water, heat transfer coefficient, cost of cooling.. The experiments were conducted on a 9, 000 1. jacketed stainless steel milk tank with mechanical stirrers, and a small-scale model (1: 7-28) of the same, tank, using water instead of milk as the liquid to be cooled. Since free convection took plac...

Kamp, J.R.; Shannon, J.C., 1960: The effects of low soil potassium, high soil calcium, and air cooling on roses grown in a high boron soil. Better Times roses were grown in cooled and un-cooled greenhouses in a soil high in B, and were supplied with different levels of K, Ca and P. Where levels of 12 p.p.m. of P and of 4 and 8 p.p.m. of K were maintained, growth was better than where...