By A. C. Bunt (auth.)
The previous 20 years have visible fast advances within the expertise used to supply pot vegetation. Glasshouses designed and oriented to offer maxi mum gentle transmission, absolutely automated heating and ventilating structures, carbon dioxide enrichment of the ambience, managed photoperiods utilizing automated blackouts and incandescent lamps which allow crops resembling chrysanthemum to be flowered at any time of the 12 months, mist propagation options, chemical progress regulators which keep watch over the peak of crops, automated watering and feeding structures, etc.: those are just a few of the advancements that have remodeled pot plant tradition. There have additionally been many adjustments within the composts and platforms used to develop the vegetation. Mineral soils, which shaped the foundation of the loo Innes composts, at the moment are both too pricey or too tough to acquire in appropriate caliber and adequate volume. accordingly the grower has been pressured to hunt different fabrics comparable to peat, perlite, vermiculite, plastic foam, shredded bark, and so forth. New sorts of fertilizers, new equipment of warmth sterilization and new chemical sterilizing brokers also are being used.
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Extra resources for Media and Mixes for Container-Grown Plants: A manual on the preparation and use of growing media for pot plants
Identification of the toxins present in softwood barks has been studied by Yazaki & Nichols (1978), Solbraa (1979b), Solbraa & Selmer-Olsen (1981), and Aaron (1982); toxins in hardwood bark were identified by Still et al. (1976). The toxins can be of organic or inorganic origin. Organic compounds Yazaki & Nichols (1978) identified a number of phenolic componds in P. radiata bark. The degree of toxicity was related to the concentrations of catechin and 3,5,3',4'-tetrahydroxystilbene leached from the bark.
Tissue analysis of the leaves of plants grown in a mix having 33% by volume of Cofuna, but which did not receive any liquid fertilizers, showed that the levels of phosphorus, calcium, magnesium and iron were similar to those of plants grown in a mix without Cofuna, but which had been given weekly applications of liquid fertilizers. The nitrogen and potassium levels of the plants grown in the Cofuna mix were between 50 and 70% of those levels in plants which had been given regular liquid feeding.
In this form it has a high porosity value and a good air-water relationship. The material is available in a number of grades, ranging from a fine particle grade for seed germination, up to a grade with particles 6 mm (1 in) in diameter; the average density is only about 80 kg m- 3 (SIb ft- 3 ). Vermiculite has a relatively high cation exchange capacity, about 100-150 meq 100 g-l and compares favourably with peat in this respect. Most samples contain 5-8% of available potassium and 9-12% of magnesium; mixes containing vermiculite therefore require less of these minerals in the base fertilizer.