淡黄色或柑橘叶

Autumn is a good time to check your citrus trees for magnesium deficiency. Citrus have a high magnesium requirement and magnesium is essential for the formation of chlorophyll (green colour) in leaves. Without enough magnesium plants will not be able to make sugars and starches, and growth will be poor.
Magnesium deficiency often shows up in citrus in autumn because magnesium is also required for developing fruit and many citrus species produce fruit over the cooler months.
因为镁是植物非常机动,在此镁基本要素导致的短缺正在从老叶向新的增长绘制。缺陷显示为淡叶,与帧间静脉变黄最老的叶的外边缘的开始,使得一个绿色的V保持与叶尖在V点,并且最接近于所述杆在V的最宽部分。在极端情况下,整个叶片可能黄色。
Magnesium deficiency can occur in several ways. If soil is too dry roots can’t absorb magnesium, so regular watering of citrus is necessary. It is more common where soil is quite acidic and this can be remedied by watering in some dolomite, which will supply magnesium, plus calcium to raise the pH. If soil pH is in a suitable range for citrus, magnesium deficiency can also occur where heavy rain has leached it from soil, or where excess potassium has been added to soil – this includes use of wood ash, or overuse of seaweed fertilisers, which can cause a build up of potassium.
In these situations, a quick remedy to save this year’s crop is to dissolve some Epsom salts in a small amount of warm water, then dilute it in a full watering can of cold water, and water it into the soil under the outer part of the foliage canopy. You will need about 250 g of Epsom salts for a very young tree, and up to 2 kg for a fully-grown tree.
Magnesium is also important for sweetness of fruit. If your citrus fruits are not as sweet as you would like, it could be due to magnesium deficiency.
However, a general yellowing or paleness of all leaves (chlorosis), while only the veins remain green, could be the result of iron deficiency. Iron deficiency begins in the youngest leaves. This can occur where soil is too alkaline for the tree to absorb iron. If the alkalinity occurred through an accidental overdose of lime or dolomite, the pH can be lowered by adding elemental sulphur to the soil around the tree. If soils are generally alkaline, including some well-rotted cow or horse manure that has NOT had lime added (under mulch, but not dug in) as part of your fertiliser will help reduce the pH by replacing some of the calcium ions in soil with hydrogen ions as it decomposes. To prevent crop losses, it is worthwhile checking soil pH around citrus trees each spring, and correcting it, if necessary.
也可以看看:Feeding citrus

19个回复到“黄色或淡柑橘叶片”

  1. Fantastic! I have a lemon tree that has just started to yellow. I’ll give it a try. Fantastic blog. Keep it up!

  2. 嗨 - 谢谢为伟大的信息是生病立即投入使用。
    你会HAEN也知道在澳大利亚你会脉间叶片黄化并最终坏死在William Hill彩票扶余柿子?在这几年的叶新枝了最影响和所有最终与树枝一起死了。只有老枝上保留树叶上期开出的季节,最具有脉间变色。
    Thanks,
    地图

  3. Thank you for your input. I’ve been wondering how to eliminate this problem on my new ‘Lotsa Lemons’ potted tree.

    再次感谢你

    David

  4. Thanks for the info. I will give the tree some Epsom salts. The tree is covered in small fruit and flowers which I do not want to stop developing.

  5. My young lemon tree is yellowing and I have applied Epsom Salt around its drip line today. My question is, how often do I give the tree the salts?
    Hi Marion, providing your tree receives an annual application of complete fertiliser, you should only need to apply Epsom Salts once a year, if required. – Lyn

  6. 嗨,我有一个大型木材tub.It一个年轻的柠檬树有很多水果,但叶子变黄和脱落!请帮忙!不wan't失去的果实!

    嗨比阿特丽斯,这是不可能找出你的问题的原因没有照片或泛黄的进一步说明,因为黄树叶的图案,还是开始了最年轻的或老叶先提供线索的问题的根源。此外,你还没有说你住的地方,所以我不知道你正在处理什么样的气候条件与根本。
    您可能会发现这篇文章有帮助:Yellow leaves-potted citrus

  7. Thank you very much!! I’ve looked for information everywhere and you guys really helped me out!

  8. 你好!我得的Osmocote小丸我柠檬水树,我已经给约每月一次。William Hill彩票我刚刚发现的叶子变黄你描述缺镁的方式。这是目前在一个锅里,住在东南部的墨尔本。这是施肥不够好?我需要给刚刚镁?(难道这就是泻盐)三江源这么多您的所有信息为止
    罗茜,目前在墨尔本很冷,release of nutrients in Osmocote are controlled by air temperature so that when weather is warmer and plants are more active, more fertiliser is released. Check the pH of your potting mix. If it is below 6.5 sprinkle dolomite over the mix surface and water it in. This remedy takes a while to work, so you can apply a foliar feed (when the rain stops) by putting into your watering can 2 teaspoons of Epsom Salts (Magnesium sulphate) for every litre your watering can holds, add a little very warm water to dissolve the crystals, then fill your watering can and water the foliage of your tree. – Lyn

  9. hi my citrus seedling is white please can you tell me why?
    萨利,你的苗差了极致缺铁。周围的土壤(或盆栽混合土)的pH过高的植物吸收的铁,这是为了在叶片提供绿色着色所必需的要素之一。如果是在一个锅里,你可以重新锅它变成了​​,pH值约6.5-7.0一些盆栽组合。如果是在地面上,你可以按照说明在后的最后一段以上,或购买一些螯合铁,并根据指示应用它。但是,除非你纠正土壤pH值,你会继续有问题,因为土壤的pH值控制养分的有效性。看到Soil pH is so important.

  10. 感谢您的文章。看来,ph值是非常重要的。在我们的农场,新成立的树叶的颜色是(几乎是白色的)苍白。可能是什么原因?其中化肥将是最合适的?植物是4岁左右。William Hill彩票提前致谢。
    维杰,文章和答案之前的评论的最后一段建议所造成的碱性土壤中缺铁是这个问题的原因。一般来说,一个完整的有机肥是柑橘好,但是,如果你需要纠正土壤的pH值,使树木能够吸收他们所需要的营养物质。看到测试土壤的pH值– Lyn

  11. 这是伟大的信息。我的柠檬树是3岁左右,约5英尺高,William Hill彩票并已做精美直到最近,当一些黄色的树叶已经显示出来。我只是把它200gr稀释温水中加入冷水,然后叶面树冠下兑水全喷壶泻盐的 - 因为你上述建议。我已用了足够的泻盐为这个身高和年龄的树?我多久才能看到效果好?非常感谢

    You could have used 50 – 100 grams more of epsom salts, Caroline. It will probably take about a month to work. If you are looking for a quicker result, you can dissolve 20 g of Epsom Salts per litre of water and use it as a foliar spray – but not in the heat of the day. Also check the pH of soil around the tree as this deficiency is more likely to occur when the soil is too acidic. This can be improved by watering in some good quality dolomite, which contains both magnesium and calcium. – Lyn

  12. 林恩,Thank you for taking your time to write this article I have found it very thought provoking. If you don’t mind I would like to ask a few questions as my family have tried many times and failed on our property to get citrus to grow. I live in Gladstone Central Qld.
    我的叶子看起来更像第一张照片,但有污点黄色与其说是V,那么第二张图片,新的增长其中有一阵巨大的是完美的绿色糯期待。
    1.我已经把混合家禽覆盖各地的缓释肥料每棵树和我每周之后的液体鱼肥的指令。我的床是沙质/壤土。我有2-3“甘蔗地膜覆盖整个柑橘果园面积的,所以没有草或杂草。
    2.我一直在探索与湿度探头地上,它告诉我,我在流泪,所以我已经停止/放缓浇水,以保持计在“潮湿”区。这是正确的吗?
    3.我使用的探针的pH测试大气压,它被读4-5pH。要纠正这一点,我对生态FLO石灰添加喷雾和周围放置白云石力量。多久你等待,看看是否需要另一剂量?有没有更好的方法吗?
    4.在两棵树我跑家禽混合覆盖和使用的牛混合覆盖的出来,这将会对那些两棵树产生负面影响?这些都是2棵新树,我今天注意到的是让周围的王冠有些泛黄的一棵树上,但有​​很多花/新的增长开始。另一种是仍然显示在树中,但没有黄冠叶卷曲。我有两个树种植,现在出2-3周,是健康的,你可以去的Bunnings中获得。
    Thank you in advance for you help.

    保罗,除了过度浇水,您的问题似乎是你非常酸性土,如果你的阅读是可靠的。主要营养成分没有可用来在该范围内的植物和你是在浪费你已经应用了肥料。I say ‘if the reading is reliable’ because I don’t think probes are the best way to get a pH reading unless you take multiple readings in a plant area, add them up, then divide by the number of readings to get the average pH for that area. A simpler way to do it is to use aManutec pH Test Kit. Agricultural lime or dolomite take about a month to have an effect on soil pH. Test again after that time and apply another dose if necessary.
    停止使用化肥的鱼,直到你的pH值a healthy range. The concentrate is quite acidic and will slow your efforts to raise the soil pH. Add compost to the soil surface under mulch as compost helps buffer plant roots from undesirable soil pH in surrounding soil. Keep both compost and mulch one hand width from the trunks. And, only water when the top centimetre of soil is dry. – Lyn

  13. Hi There, I have a new Mandarin tree approx 6′ high. I planted it a month ago & added 4-5 handfuls of Gypsum at the base of the hole as there was clay below it & I thought the Gypsum would start to break up the clay for root penetration etc. However I have found that the leaves are turning yellow and wonder if I should pull out the mandarin and remove the Gypsum OR whether I can apply Elemental Sulphur or any other product to lower the Ph although I would think I’d have to get this done quickly..? Please advise, and thanks.
    Did you fill the planting hole with water to check drainage before you planted? There are several reasons why your tree may be producing yellow leaves. Water may be sitting in the base of the hole and gypsum doesn’t work overnight. If you didn’t check the drainage, and you have clay sub-soil, it might be worthwhile lifting the tree and putting some good topsoil mixed with compost that has a pH of around 6.5 in the base of the hole so that your tree is on a slight mound. – Lyn

  14. You say that seaweed fertilisers are high in potassium. Maybe you should be more specific. Seaweed extracts are often referred to as fertilisers but this is a mistake. Many seaweed products (eg Seasol) contain negligible amounts of NPK. They have natural plant hormones that stimulate growth. Of course some seaweed products do contain NPK (added) so of course you must always check the label.

    最可用的海藻产品是按比例较高的钾(K)与氮(N)和磷(P)。例如,Seasol含有0.1%N,0.01%P和1.5%的钾,其是比氮气的15倍。阿卡迪亚含有1.0-2.0%N,1.0-2.0%的P,和16-20%K.相比之下,加入Natrakelp的18-3-10具有相当大的量的NPK的,用氮气作为主导养分。
    Problems can occur when people use only seaweed extract as a fertiliser, and some apply it every fortnight, resulting in an imbalance of nutrients available to plants. Seaweed extracts are only a supplementary fertiliser and it is the natural growth promoters and amino acids that provide many of its benefits to plants, including an improved immune system, pest resistance, and better tolerance of heat and cold.
    也可以看看:海藻花园

  15. 非常感谢这篇文章。有关可能缺铁最后一部分似乎是William Hill彩票我的柠檬树(真的树苗),这在我的观察一直含情脉脉,它不发展近期小芽和它的叶子特别是刚走外观较新的芽,你形容为可能标志着那么重要缺铁。
    而现在,通过你的文章提示,我已经与瑟尔斯测试套件,这在我的经验,在过去已使有用的结果测试,在不同的地方土壤旁边。我发现,最高的pH值 - 即更紫色resuls - 似乎对应于牛粪的圈子我申请周围的小树,几个星期前,一个小圆圈内发生。它看起来像关于根据提供的测试William Hill彩票比色图表PH9。然后,我测试了粪便本身试剂盒。它应该是一个优质的产品,没有添加剂,但它变成明亮的紫色表明我认为也许是13或14中的pH值,除非粪结果比那些土壤有不同的含义?
    Perhaps this is normal but surely not? Anyway I’ve now contacted the supplier of the manure and am waiting for a call back. I think there may have been a mild problem before, leading to slowish growth but since the addition of the manure all growth has ceased. But at least if I know the problem I can address it if possible.

    我不熟悉塞尔的pH值检测试剂盒,辛西娅和他们的网站没有提供该套件的任何细节。该Manutec一个,我使用显示出强大的紫色在9.5-10。这是很可能的是,高pH值读数为奶牛粪便是由于加入了石灰。显然,一些客户抱怨牛粪的臭味和处理器开始添加石灰,以减少气味。William Hill彩票不幸的是,这可以使pH值到不合适的水平,植物就不能吸收他们需要成长的养分。这是明智的,在使用前总是测试肥料,土壤改良剂,以及堆肥的pH值,使您可以硫,铁螯合物,或通过堆肥具有较低的pH值减少的问题混合。

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