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Question: how iron sulphate is used
hi, I wanted to ask you three questions. in my garden I have two very large cycads about 1.5 meters in diameter and unfortunately on some leaves not all of them are dotted with yellow dots. I also have a camellia which lost some of its leaves this year during flowering and these too had turned yellow. So I wanted to ask you if it is okay to fertilize both the cycas and camellia plants with iron sulfate or if I have to do any other treatment to resolve the problem. Finally, I ask you when orange plants should be pruned. I await your reply. I thank you in advance and best regards. Franco
Iron sulfate: Answer: greening fertilizers
the plants, in order to develop luxuriant and healthy, need some mineral salts; the most important and fundamental, which serve in higher doses, are Nitrogen, Phosphorus and Potassium; the most used fertilizers, those with the words "for flowering plants" or "universal fertilizer", contain large quantities of these three elements, in variable quantities, expressed by the numeretti that you can read next to the writing NPK (where N stands for Nitrogen , P for phosphorus and K for potassium). In some excellent fertilizers, in addition to these three elements, there are also different minerals, in small quantities, such as iron, manganese, boron, calcium. Plants need all these salts, in different ways, depending on the plant and depending on the season. As for iron, it is commonly dissolved in all soils, except that in some soils, and for some plants, it is difficult to absorb; therefore in some special cases, it is beneficial to plant health, also use the iron sulfate as a greening fertilizer. It is called soothing because some plants (in particular the acidophilic plants), if they are unable to absorb sufficient iron from the soil, tend to become discolored, becoming an ever lighter green, almost yellow, but still green, a sort of acid green.
As for camellias and cycas, these plants sometimes fail to assimilate the present iron from the ground, or the iron in the soil is hardly absorbed due to the strong presence of limestone; for this reason it may be useful to supply your plants with iron sulphate, but only once every 3-5 months. Greening fertilizers are often used even when the plants do not present the typical symptoms of iron deficiency; however, this operation takes place only once a year, at the beginning of spring, when fertilizers are used again, even those based on NPK. If used as the sole fertilizer, or used in large quantities, iron sulfate becomes harmful to plants, because they do not need so much iron, and because, despite being enriched with iron, the soil around the plants could still be lacking in salts most important and fundamental minerals for plant life. Therefore, the reason why your camellia has yellow leaves, could be the excess of iron sulphate in the soil, which makes the soil more acidic, but in large quantities it can also damage the root system of plants (like any fertilizer). I therefore advise you to suspend the supply of iron sulphate, and begin proper fertilization, using a fertilizer to dissolve in water, every 15-20 days, based on nitrogen, phosphorus and potassium; or a slow release granular fertilizer, which is used only once in spring, spreading it around the plants. Always pay attention to the suggested doses on the product label. As for the yellow dots on the cycas, they could have been caused by scale insects, which often afflict these plants; try to look on the underside of the fronds, you should find insects, similar to small stiff little badges. The pruning of the orange is practiced in summer and in winter, only the thin branches, or ruined by the bad weather, and the suckers are removed.