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ritau
2020年06月04日
ritau
Kiwifruit (often shortened to kiwi outside Australia and New Zealand), or Chinese gooseberry, is the edible berry of several species of woody vines in the genus Actinidia. The most common cultivar group of kiwifruit (Actinidia deliciosa 'Hayward') is oval, about the size of a large hen's egg: 5–8 centimetres (2–3 inches) in length and 4.5–5.5 cm (1 3⁄4–2 1⁄4 in) in diameter. It has a thin, hair-like, fibrous, sour-but-edible light brown skin and light green or golden flesh with rows of tiny, black, edible seeds. The fruit has a soft texture with a sweet and unique flavour. In 2017, China produced 50% of the world total of kiwifruit. Kiwifruit is native to central and eastern China. The first recorded description of the kiwifruit dates to the 12th century during the Song dynasty. In the early 20th century, cultivation of kiwifruit spread from China to New Zealand, where the first commercial plantings occurred. The fruit became popular with British and American servicemen stationed in New Zealand during World War II, and later became commonly exported, first to Great Britain and then to California in the 1960s. Kiwifruit can be grown in most temperate climates with adequate summer heat. Where fuzzy kiwifruit is not hardy, other species can be grown as substitutes. [图片]*Breeding Often in commercial farming, different breeds are used for rootstock, fruit bearing plants and pollinators. Therefore, the seeds produced are crossbreeds of their parents. Even if the same breeds are used for pollinators and fruit bearing plants, there is no guarantee that the fruit will have the same quality as the parent. Additionally, seedlings take seven years before they flower, so determining whether the kiwi is fruit bearing or a pollinator is time-consuming. Therefore, most kiwifruits, with the exception of rootstock and new cultivars, are propagated asexually. This is done by grafting the fruit producing plant onto rootstock grown from seedlings or, if the plant is desired to be a true cultivar, rootstock grown from cuttings of a mature plant. *Pollination Kiwifruit flowering Kiwifruit plants generally are dioecious, meaning a plant is either male or female. The male plants have flowers that produce pollen, the females receive the pollen to fertilise their ovules and grow fruit; most kiwifruit requires a male plant to pollinate the female plant. For a good yield of fruit, one male vine for every three to eight female vines is considered adequate. Some varieties can self pollinate, but even they produce a greater and more reliable yield when pollinated by male kiwifruit.Cross-species pollination is often (but not always) successful as long as bloom times are synchronised. In nature, the species are pollinated by birds and native bumblebees, which visit the flowers for pollen, not nectar. The female flowers produce fake anthers with what appears to be pollen on the tips in order to attract the pollinators, although these fake anthers lack the DNA and food value of the male anthers. Kiwifruit growers rely on honey bees, the principal ‘for-hire’ pollinator. But commercially grown kiwifruit is notoriously difficult to pollinate. The flowers are not very attractive to honey bees, in part because the flowers do not produce nectar and bees quickly learn to prefer flowers with nectar. And for kiwifruit, honey bees are inefficient cross-pollinators because they practice “floral fidelity”. Each honey bee visits only a single type of flower in any foray and maybe only a few branches of a single plant. The pollen needed from a different plant (such as a male for a female kiwifruit) might never reach it were it not for the cross-pollination that principally occurs in the crowded colony. It is in the colonies where bees laden with different pollen literally cross paths. To deal with these pollination challenges, some producers blow collected pollen over the female flowers. Most common, though, is saturation pollination, where the honey bee populations are made so large (by placing hives in the orchards at a concentration of about 8 hives per hectare) that bees are forced to use this flower because of intense competition for all flowers within flight distance. Maturation and harvest Kiwifruit is picked by hand and commercially grown on sturdy support structures, as it can produce several tonnes per hectare, more than the rather weak vines can support. These are generally equipped with a watering system for irrigation and frost protection in the spring. Kiwifruit vines require vigorous pruning, similar to that of grapevines. Fruit is borne on one-year-old and older canes, but production declines as each cane ages. Canes should be pruned off and replaced after their third year. In the northern hemisphere the fruit ripens in November, while in the southern it ripens in May. Four year-old plants can produce up to 14,000 lbs per acre while eight year-old plants can produce 18,000 lbs per acre. The plants produce their maximum at 8 to 10 years old. The seasonal yields are variable, a heavy crop on a vine one season generally comes with a light crop the following season. [图片]*Nutrition In a 100-gram amount, green kiwifruit provides 61 calories, is 83% water and 15% carbohydrates, with negligible protein and fat. It is particularly rich (20% or more of the Daily Value, DV) in vitamin C (112% DV) and vitamin K (38% DV), has a moderate content of vitamin E (10% DV), with no other micronutrients in significant content. Gold kiwifruit has similar nutritional value, although only vitamin C has high content in a 100 gram amount (194% DV). Kiwifruit seed oil contains on average 62% alpha-linolenic acid, an omega-3 fatty acid. Kiwifruit pulp contains carotenoids, such as provitamin A beta-carotene, lutein and zeaxanthin.
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Miss Chen
2020年06月04日
Miss Chen
千佛手是一种十分受人喜欢的多肉植物,那么千佛手怎么养才能变红呢?下面我们就来了解一下。 [图片]充足光照 想要千佛手变红,那么我们在样子过程中要尽量的保持光照的充足,除去夏季光照强烈的季节以外,其他的季节一定要多晒太阳,只有光照充足了千佛手的光合作用才能更加充分,这样千佛手才能合成更多的养分,养分充足千佛手才能变红,给千佛手晒太阳的时候要记得每隔一段时间就转动一下花盆,让千佛手受光更加均匀。 加大温差 千佛手叶片变红除了充足的光照以外,跟温度还有很大的关系,只有在温差较大时,千佛手的叶片才会变红,所以我们在养护千佛手的时候要注意温差,当温差在15度左右的时候千佛手的叶片颜色是最好看的,所以一般千佛手叶片变红都是在秋季。 [图片]摘除老叶 千佛手在生长过程中,有些叶片会逐渐老化,被慢慢的代谢掉,如果我们养护正常,有些叶片出现了皱褶,那么这就是要脱落的老叶了,我们最好在老叶脱落之前就将它摘掉,因为这些老叶还没有掉落,就会消耗养分,这样会浪费很多的养分,所以我们要将这些老叶摘掉,节省养分,这样才能让千佛手更好的变红。 小编建议 我们在养护千佛手的时候,一定要保持充足的光照,并且保持一定的温差,这样千佛手的叶片才能变红,观赏价值也会更高。
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Miss Chen
2020年06月03日
Miss Chen
很多新手肉友不知道夏天多肉能不能放在室内养护,下面小编就带大家了解一下。 [图片]1夏天多肉可以放室内吗 夏天多肉可以放在室内养护,但是要注意保持良好的通风,因为室内的通风环境毕竟不如室外,而多肉在过于闷热的环境中很容易出现病虫害,同时不要让多肉长时间不见光照,这样多肉容易徒长,如果夏天室内有空调,那么我们要避免将多肉放在空调的出风口,因为出风口的温度很低,容易冻伤多肉的叶片。 2夏季室内养多肉的注意事项 光照 我们都知道夏季养护多肉要避免将它放在有直射光照的环境中,但是在室内养护多肉的时候,也不要将它放在完全没有光照的环境,否则多肉很容易徒长,严重会导致多肉死亡。 透气 夏季在室内养护多肉要保持良好的通风,因为室内的通风效果比室外要差很多,所以温度也会更高,如果通风不良的话会影响多肉的生长,即使室内有空调,那么我们也要经常开窗通风,保持空气清新。 浇水 夏季在室内养护多肉还需要注意浇水问题,因为多肉在室内水分蒸发的速度会比较慢,所以我们给多肉浇水的时候一定不要过量,少量给水就可以了。 [图片]3小编建议 夏天在室内养护多肉,最好将它放在有散射光照的环境中,并且保持通风,如果温度过高要为多肉喷水降温,室内如果有空调要避免将多肉放在出风口。
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ritau
2020年06月02日
ritau
A plum is a fruit of the subgenus Prunus of the genus Prunus. The subgenus is distinguished from other subgenera (peaches, cherries, bird cherries, etc.) in the shoots having terminal bud and solitary side buds (not clustered), the flowers in groups of one to five together on short stems, and the fruit having a groove running down one side and a smooth stone (or pit). Mature plum fruit may have a dusty-white waxy coating that gives them a glaucous appearance. This is an epicuticular wax coating and is known as "wax bloom". Dried plum fruits are called "dried plums" or prunes, although, in many countries (Li hing mui for instance), prunes are a distinct type of dried plum having a wrinkled appearance. Plums may have been one of the first fruits domesticated by humans. Three of the most abundant cultivars are not found in the wild, only around human settlements: Prunus domestica has been traced to East European and Caucasian mountains, while Prunus salicina and Prunus simonii originated in Asia. Plum remains have been found in Neolithic age archaeological sites along with olives, grapes and figs. According to Ken Albala, plums originated in Iran. [图片]Plums are a diverse group of species. The commercially important plum trees are medium-sized, usually pruned to 5–6 metres height. The tree is of medium hardiness.Without pruning, the trees can reach 12 metres in height and spread across 10 metres. They blossom in different months in different parts of the world; for example, in about January in Taiwan and early April in the United Kingdom. Fruits are usually of medium size, between 2 and 7 centimetres in diameter, globose to oval. The flesh is firm and juicy. The fruit's peel is smooth, with a natural waxy surface that adheres to the flesh. The plum is a drupe, meaning its fleshy fruit surrounds a single hard seed. Plum cultivars include: *Damson (purple or black skin, green flesh, clingstone, astringent) *Greengage (firm, green flesh and skin even when ripe) *Mirabelle (dark yellow, predominantly grown in northeast France) *Satsuma plum (firm red flesh with a red skin) *Victoria (yellow flesh with a red or mottled skin) *Yellowgage or golden plum (similar to greengage, but yellow) [图片]Raw plums are 87% water, 11% carbohydrates, 1% protein, and less than 1% fat. In a 100 gram amount, raw plums supply 46 calories and are a moderate source only of vitamin C (12% Daily Value), with no other nutrients in significant content.
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Miss Chen
2020年06月02日
Miss Chen
情人泪是一种外形比较奇特的多肉植物,它可以当做垂吊植物来养护,那么情人泪干瘪了要怎么补救呢?下面我们就来了解一下。 [图片]散射光照 情人泪多肉和其他多肉有一些不同,它比较害怕阳光直射,尤其是夏季强烈的光照,适合在半阴的环境中生长,如果我们将情人泪多肉放在阳光下直射,那么情人泪叶片内的水分会被蒸发掉,这样就会导致情人泪多肉干瘪的情况出现,这时候我们要将情人泪转移到有散射光照的环境中,并适当的喷一些水来帮助它恢复。 修剪根部 如果不是因为光照的温度导致情人泪干瘪,那么很有可能是因为情人泪的根部出现问题了,首先我们要将情人泪脱盆,将根部清洗干净之后,对根部进行检查,如果是因为根部腐烂造成的,那么我们要对烂根进行清理,将所有腐烂的部位全部剪掉,然后对伤口进行消毒,最后放在阴凉通风的环境中将伤口晾干,最后再重新上盆。 [图片]及时补水 情人泪是比较耐旱的多肉植物,它的叶片有着很强的储水能力,所以平时养护不需要过多的浇水,但是有些肉友在养护情人泪的时候,因为浇水间隔过长,就会导致忘记浇水,这时候情人泪多肉就会消耗叶片内储存的水分,水分消耗光之后,叶片就会干瘪,所以我们平时发现土壤已经干透之后就要及时的补充水分。
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