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我就是学植物学出生的，植物生理学是一个方向，肉锥属植物几乎不需要什么矿质营养，因为它太小了。所以肉锥这类的植物的矿质营养是反复利用的
mesagarden的Steven Hammer写的关于番杏类植物的栽培问题。他是业界和学术界的权威。
我引用一段：
4.1. Feeding Frenzies
I currently use no artificial fertilizers on adult plants, except for the minute traces I administer via the mister. Excessively strong or improperly balanced fertilizers can cause strange alterations of color (electric blues, screaming parrot greens), disfiguring pimples and other skin eruptions, black spots, floral abortions and conversions, gross obesity, and above all, a strong tendency to rupture after watering. So I find it better to simply leave most fertilizers alone. Now that I have stopped feeding them, the plants are cleaner and more authentically colored.
The safest and most effective way to fertilize mesembs is simply to repot them. Failing this, it is a good practice to mulch long-potted plants with new soil, which will gradually work its way down like wet grout in new-laid tile. Even a very light scattering of soil will help. In any case, the nutritive requirements of most species are so low that it takes years for a soil mix, assuming that it is loam-based, to be exhausted. Very often, any apparent exhaustion is simply a symptom of insufficient watering or of undetected overheating.
The best guide to real deficiencies (short of a chemistry degree or access to that rare thing, a succulent-savvy agricultural advisor) is to look at the color of young leaves. Few healthy mesembs have yellowish leaves, barring a few species in Astridia, Bijlia, Cephalophyllum, Titanopsis, and Vanheerdea. If new growth shows yellowing, especially a streaked yellowing, then there is probably a problem with alkalinity and (consequently) with iron absorption.
Growers who use an “artificial mix” (i.e., the potting-soil-pumice-or-grit blend) will find that at least some of their plants need fertilizer on a regular basis. For this situation I recommend one low in nitrogen and high in potassium; it should be diluted to a twentieth the recommended strength. It is most useful in early fall and early spring and should never be used in mid-winter. At this time most mesembs are experiencing their annual climacteric, and feeding only confuses them.
I do feed seedlings. Physiologically, they are radically different from adults. One wouldn't feed a lean or spicy meal to a human baby (though Koreans accept kimchi at six months), and so it is with young plants, which need to fatten up as rapidly and yet as gently as possible. Thus a daily mist of highly dilute fertilizer water is most beneficial. |
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楼主: 竹梅春秋
发表于 2013-8-31 09:55
